Transparent Paper-Based Triboelectric Nanogenerator As Page Mark and Anti-Theft Sensor

Total Page:16

File Type:pdf, Size:1020Kb

Transparent Paper-Based Triboelectric Nanogenerator As Page Mark and Anti-Theft Sensor Nano Research 1 DOINano 10.1007/s12274Res -014-0484-1 Transparent paper-based triboelectric nanogenerator as page mark and anti-theft sensor Li Min Zhang1†, Fei Xue1†, Weiming Du1, Chang Bao Han1, Chi Zhang1, and Zhong Lin Wang1,2 () Nano Res., Just Accepted Manuscript • DOI: 10.1007/s12274-014-0484-1 http://www.thenanoresearch.com on April 18, 2014 © Tsinghua University Press 2014 Just Accepted This is a “Just Accepted” manuscript, which has been examined by the peer-review process and has been accepted for publication. A “Just Accepted” manuscript is published online shortly after its acceptance, which is prior to technical editing and formatting and author proofing. Tsinghua University Press (TUP) provides “Just Accepted” as an optional and free service which allows authors to make their results available to the research community as soon as possible after acceptance. After a manuscript has been technically edited and formatted, it will be removed from the “Just Accepted” Web site and published as an ASAP article. Please note that technical editing may introduce minor changes to the manuscript text and/or graphics which may affect the content, and all legal disclaimers that apply to the journal pertain. In no event shall TUP be held responsible for errors or consequences arising from the use of any information contained in these “Just Accepted” manuscripts. To cite this manuscript please use its Digital Object Identifier (DOI® ), which is identical for all formats of publication. TABLE OF CONTENTS (TOC) Transparent paper-based triboelectric nanogenerator as page mark and anti-theft sensor Li Min Zhang1†, Fei Xue1†, Weiming Du1, Chang Bao 1 1 1,2 Han , Chi Zhang , and Zhong Lin Wang 1Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, China. 2School of Material Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. We integrate grating-structured PTENGs into a book as a self-powered anti-theft sensor, which can effectively convert mechanical triggering agitated during handling the book pages into an electric output to either drive a commercial electronic device or trigger a warning buzzer. Furthermore, different grating-structures on each page produce different number of output peaks which can accurately position the turned pages and record the pages flipped over. Zhong Lin Wang, http://www.nanoscience.gatech.edu/ Nano Research DOI (automatically inserted by the publisher) Research Article Transparent paper-based triboelectric nanogenerator as page mark and anti-theft sensor Li Min Zhang1†, Fei Xue1†, Weiming Du1, Chang Bao Han1, Chi Zhang1, and Zhong Lin Wang1,2 () † Received: day month year ABSTRACT Revised: day month year The triboelectric nanogenerator (TENG), based on the well-known triboelectric Accepted: day month year effect and electrostatic induction effect, has been proven to be a simple, cost (automatically inserted by effective approach for self-powered systems to convert ambient mechanical the publisher) energy into electricity. We report a flexible and transparent paper-based triboelectric nanogenerator (PTENG) consisting of an indium tin oxide (ITO) © Tsinghua University Press film and a polyethylene terephthalate (PET) film as the triboelectric surfaces, and Springer-Verlag Berlin which not only acts as an energy supply but also a self-powered active sensor. It Heidelberg 2014 can harvest kinetic energy when the papers contact, bend or relatively slide by a combination of vertical contact-separation mode and lateral sliding mode. In KEYWORDS addition, we also integrate grating-structured PTENGs into a book as a self-powered anti-theft sensor. The mechanical triggering agitated during paper-based triboelectric handling the book pages can be effectively converted into an electric output to nanogenerator, either drive a commercial electronic device or trigger a warning buzzer. self-powered systems, Furthermore, different grating-structures on each page produce different anti-theft sensor, position, number of output peaks by relatively sliding, which can accurately act as a page indium tin oxide mark and record the pages flipped over. This work is a significant step forward in self-powered paper-based devices. 1 Introduction health monitoring, infrastructure and environmental monitoring, internet of things and With the enormous development of the world defense technologies [4-7]. Now a sensor network is technology towards miniaturization, portability and usually integrated by several different functional functionality in the recent years [1-3], sensor sensors and many small electronic devices. A network has been a powerful driving force for the practical challenge for portable sensor network is next phase of information technology. More and the huge number of batteries used in the system, more types of sensors have been widely used in Address correspondence to [email protected] 2 Nano Res. which needs to be recharged, replaced, monitored trigger a warning buzzer. Furthermore, different and maintained. This will cause not only a grating-structures on each page produce different horrendous task but also environmental and health number of output peaks, which can accurately concerns. A self-powered system aiming at position the turned pages and record the pages harvesting energy from the environment [8-11] to flipped over. This work provides a potential power sensor networks is proposed to offset or even method to develop the self-powered, durable, cost replace the reliance of small portable electronics on effective anti-theft system for books, paintings and batteries [2, 12, 13], which will make great any other flexible materials in the future. contribution to the whole environment in the next few decades. So far, portable and renewable human 2 Experimental section motion-driven self-powered systems have been scavenged with diverse approaches based on 2.1 Fabrication of the PTENG piezoelectrics [14-17], electrostatics [18, 19], and electromagnetics [20, 21]. Recently, triboelectric Two pieces of commercial printing paper (33 nanogenerator (TENG) [22, 23] has been mm × 33 mm) with a thickness of 0.2 mm were demonstrated as an efficient device to convert cleaned and then deposited with a 1 m layer of different types of mechanical energy such as human ITO on one side to form ITO-paper. Then a layer of motion, vibration, sonic wave, automobile motion PET film with the thickness of 0.1 mm was adhered and more into electricity. on one piece paper, contacting with the ITO film to Paper has been widely used for thousands of form PET-ITO-paper. Finally, the two parts were years in human civilization [24], for the outstanding assembled together with the PET film facing to the advantages of lightweight, cheap, flexible and ITO film, as shown in Figure 1a. The PTENG was environment friendly. Over the past decades, driven with a linear motor (Linmot E1100) at an paper-based functional electronic devices have acceleration rate of ±10 m/s2 and the maximum opened up a new era of applications in circuits, velocity of 0.6 m/s. The transferred charge and chips and sensors. Although the development of open-circuit voltage were measured by an integrated technology has enlarged the range of electrometer with very large input resistance applications of paper-based electronic devices, the (Kethily, 6514). The short-circuit current of the fatal weakness for the paper-based systems is too PTENG was measured using a Stanford low-noise much dependence on external power supply. Hence current preamplifier (Model SR570). making the paper-based systems work independently and sustainably has profound 2.2 Fabrication of a self-powered page mark and significance. In this paper, we demonstrate a new anti-theft sensor based on the PTENG type of paper-based triboelectric nanogenerator (PTENG) using indium tin oxide (ITO) film and Grating-structured PTENGs were applied into polyethylene terephthalate (PET) film as each page of a book to form a self-powered triboelectric surfaces and it can be made in a book anti-theft sensor. The grating-structured PTENGs or any other paper products to harvest kinetic were made on the adjacent pages, as shown in energy when the papers contact, bend or relatively Figure 4a. The one-grating-structures were adhered slide with the advantages of both transparent and on the even pages, and the multi-grating-structures flexible. In addition, we also integrate were adhered on the odd pages. Assuming the grating-structured PTENGs into a book as a number of grating is n, the number of odd page is self-powered anti-theft sensor. The mechanical (2n-1). Each grating has a dimension of 5 mm × 20 triggering agitated during handling the book pages mm. can be effectively converted into an electric output to either drive a commercial electronic device or 3 Result and discussion | www.editorialmanager.com/nare/default.asp Nano Res. 3 of the PTENG in vertical contact-separation mode. Figure 1a illustrates the basic structure of the A periodic contact and separation drives the fabricated PTENG. The lower part is a thin layer of induced electrons go back and forth through the ITO film deposited on a commercial printing paper, external circuit. Furthermore, Figure 1e illustrates a where the ITO film acts as both the triboelectric cycle of electricity generation process in lateral surface and the electrode. The upper part is sliding mode. Similarly, the upper film slides in and fabricated by pasting another layer of PET on the out, producing electric potential
Recommended publications
  • Piezoelectricity in PVDF and PVDF Based Piezoelectric Nanogenerator: a Concept
    IOSR Journal of Applied Physics (IOSR-JAP) e-ISSN: 2278-4861.Volume 9, Issue 3 Ver. I (May. – June. 2017), PP 95-99 www.iosrjournals.org Piezoelectricity in PVDF and PVDF Based Piezoelectric Nanogenerator: A Concept Binoy Bera1,*, Madhumita Das Sarkar2 1,2Department of computer science and engineering, West Bengal University of Technology, Kolkata – 700064, India Abstract: Polyvinylidene fluoride or simply PVDF is one of the most important semicrystalline polymers which generate piezoelectricity when a pressure or mechanical force applied on it. It has four crystalline phases α, β, ɣ and δ depending on the chain conformation structure. Among them α is non polar phase and β and ɣ are polar phase. Piezoelectricity in PVDF arises due to the β and ɣ phase formation. Several materials have been introduced for the preparation of nanogenerator. Among them PVDF (polyvinylidene fluoride) is most interesting material used in nanogenerator preparation due to its flexibility, bio- compatiable, nontoxic in nature. It is used in nanogenerator application due to its good ferroelectric, piezoelectric and pyroelectric properties. In this article we describe little bit concept about PVDF, its piezoelectricity and PVDF based nanogenerator. Application of piezoelectric nanogenerator is also briefly described here. Keywords: PVDF, nanogenerator, piezoelectricity, β phase, electrospinning, electroactive phase, Poling process. I. Introduction Polyvinylidene fluoride, or polyvinylidene difluoride, (PVDF) is a highly non- reactive thermoplastic fluoropolymer produced by the polymerization of vinylidene difluoride. PVDF has four crystalline phases α, β, ɣ and δ depending on the chain conformation. Among them α is thermodynamically most stable and non polar in nature. β and ɣ are polar phase.
    [Show full text]
  • High Performance Triboelectric Nanogenerator and Its Applications
    HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS A Dissertation Presented to The Academic Faculty by Changsheng Wu In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY in the SCHOOL OF MATERIALS SCIENCE AND ENGINEERING Georgia Institute of Technology AUGUST 2019 COPYRIGHT © 2019 BY CHANGSHENG WU HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS Approved by: Dr. Zhong Lin Wang, Advisor Dr. C. P. Wong School of Materials Science and School of Materials Science and Engineering Engineering Georgia Institute of Technology Georgia Institute of Technology Dr. Meilin Liu Dr. Younan Xia School of Materials Science and Department of Biomedical Engineering Engineering Georgia Institute of Technology Georgia Institute of Technology Dr. David L. McDowell School of Materials Science and Engineering Georgia Institute of Technology Date Approved: [April 25, 2019] To my family and friends ACKNOWLEDGEMENTS Firstly, I would like to express my sincere gratidue to my advisor Prof. Zhong Lin Wang for his continuous support and invaluable guidance in my research. As an exceptional researcher, he is my role model for his thorough knowledge in physics and nanotechnology, indefatigable diligence, and overwhelming passion for scientific innovation. It is my great fortune and honor in having him as my advisor and learning from him in the past four years. I would also like to thank the rest of my committee members, Prof. Liu, Prof. McDowell, Prof. Wong, and Prof. Xia for their insightful advice on my doctoral research and dissertation. My sincere thanks also go to my fellow lab mates for their strong support and help. In particular, I would not be able to start my research so smoothly without the mentorship of Dr.
    [Show full text]
  • Piezoelectric Nanogenerator Using Cds Nanowires
    APPLIED PHYSICS LETTERS 92, 022105 ͑2008͒ Piezoelectric nanogenerator using CdS nanowires ͒ ͒ Yi-Feng Lin,1,2 Jinhui Song,1 Yong Ding,1 Shih-Yuan Lu,2,b and Zhong Lin Wang1,a 1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA 2Department of Chemical Engineering, Tsing Hua University, Hsinchu, Taiwan 30013, Republic of China ͑Received 2 November 2007; accepted 15 December 2007; published online 14 January 2008͒ Vertically grown cadmium sulfide ͑CdS͒ nanowire ͑NW͒ arrays were prepared using two different processes: hydrothermal and physical vapor deposition ͑PVD͒. The NWs obtained from the hydrothermal process were composed of alternating hexagonal wurtzite ͑WZ͒ and cubic zinc blende ͑ZB͒ phases with growth direction along WZ ͗0001͘ and ZB ͓111͔. The NWs produced by PVD process are single crystalline WZ phase with growth direction along ͗0001͘. These vertically grown CdS NW arrays have been used to converting mechanical energy into electricity following a developed procedure ͓Z. L. Wang and J. Song Science 312, 242 ͑2006͔͒. The basic principle of the CdS NW nanogenerator relies on the coupled piezoelectric and semiconducting properties of CdS, and the data fully support the mechanism previously proposed for ZnO NW nanogenerators and nanopiezotronics. © 2008 American Institute of Physics. ͓DOI: 10.1063/1.2831901͔ CdS is a piezoelectric semiconducting material1 with an The morphology of the hydrothermally grown CdS NWs energy band gap of about 2.5 eV. A wide range of applica- was characterized with scanning electron microscope ͑SEM͒. tions have been demonstrated for one-dimensional CdS As shown in Fig.
    [Show full text]
  • Triboelectric Nanogenerator Networks Integrated with Power Management Module for Water Wave Energy Harvesting
    FULL PAPER Blue Energy www.afm-journal.de Triboelectric Nanogenerator Networks Integrated with Power Management Module for Water Wave Energy Harvesting Xi Liang, Tao Jiang, Guoxu Liu, Tianxiao Xiao, Liang Xu, Wei Li, Fengben Xi, Chi Zhang,* and Zhong Lin Wang* by the consumption of fossil fuels have Ocean waves are one of the most promising renewable energy sources for attracted worldwide attention.[1,2] It is large-scope applications. Recently, triboelectric nanogenerator (TENG) network highly urgent to search for other renew- has been demonstrated to effectively harvest water wave energy possibly able and clean energy sources. Water toward large-scale blue energy. However, the absence of effective power wave energy, which has abundant reserves and little dependence on environmental management severely restricts the practicability of TENGs. In this work, a conditions, is a promising renewable energy hexagonal TENG network consisting of spherical TENG units based on spring- source with great potential for large-scale assisted multilayered structure, integrated with a power management module applications.[3–5] However, such energy has (PMM), is constructed for harvesting water wave energy. The output perfor- rarely been exploited due to lack of eco- mance of the TENG network is found to be determined by water wave frequen- nomical energy scavenging technologies in spite of the great efforts devoted.[6–8] cies and amplitudes, as well as the wave type. Moreover, with the implemented So far, most demonstrated converters for PMM, the TENG network could output a steady and continuous direct current water wave energy rely on the electromag- (DC) voltage on the load resistance, and the stored energy is dramatically netic generators, which are heavy, bulky, improved by up to 96 times for charging a capacitor.
    [Show full text]
  • Graphene Oxide Papers in Nanogenerators for Self-Powered
    www.nature.com/scientificreports OPEN Graphene Oxide Papers in Nanogenerators for Self-Powered Humidity Sensing by Finger Tapping Faezeh Ejehi1, Raheleh Mohammadpour1 ✉ , Elham Asadian2, Pezhman Sasanpour2,3, Somayeh Fardindoost4 & Omid Akhavan4 Triboelectric nanogenerators (TENGs) ofer an emerging market of self-sufcient power sources, converting the mechanical energy of the environment to electricity. Recently reported high power densities for the TENGs provide new applications opportunities, such as self-powered sensors. Here in this research, a fexible graphene oxide (GO) paper was fabricated through a straightforward method and utilized as the electrode of TENGs. Outstanding power density as high as 1.3 W.m−2, an open-circuit voltage up to 870 V, and a current density of 1.4 µA.cm−2 has been extracted in vertical contact-separation mode. The all-fexible TENG has been employed as a self-powered humidity sensor to investigate the efect of raising humidity on the output voltage and current by applying mechanical agitation in two forms of using a tapping device and fnger tapping. Due to the presence of superfcial functional groups on the GO paper, water molecules are inclined to be adsorbed, resulting in a considerable reduction in both generated voltage (from 144 V to 14 V) and current (from 23 µA to 3.7 µA) within the range of relative humidity of 20% to 99%. These results provide a promising applicability of the frst suggested sensitive self-powered GO TENG humidity sensor in portable/wearable electronics. Energy harvesting is an area of tremendous attention because of the huge worldwide energy demands motivating considerable research on self-powered and autonomous systems1.
    [Show full text]
  • Smart Wearable Sensors Based on Triboelectric Nanogenerator for Personal Healthcare Monitoring
    micromachines Article Smart Wearable Sensors Based on Triboelectric Nanogenerator for Personal Healthcare Monitoring Ruonan Li 1,2, Xuelian Wei 3,4, Jiahui Xu 3,4, Junhuan Chen 3, Bin Li 1, Zhiyi Wu 3,4,5,* and Zhong Lin Wang 3,4,5,6,* 1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; [email protected] (R.L.); [email protected] (B.L.) 2 Center on Nano-Energy Research, School of Physical Science & Technology, Guangxi University, Nanning 530004, China 3 Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China; [email protected] (X.W.); [email protected] (J.X.); [email protected] (J.C.) 4 College of Nanoscience and Technology, University of Chinese Academy of Science, Beijing 100049, China 5 CUSPEA Institute of Technology, Wenzhou 325024, China 6 School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA * Correspondence: [email protected] (Z.W.); [email protected] (Z.L.W.) Abstract: Accurate monitoring of motion and sleep states is critical for human health assessment, especially for a healthy life, early diagnosis of diseases, and medical care. In this work, a smart wearable sensor (SWS) based on a dual-channel triboelectric nanogenerator was presented for a real-time health monitoring system. The SWS can be worn on wrists, ankles, shoes, or other parts of the body and cloth, converting mechanical triggers into electrical output. By analyzing these signals, the SWS can precisely and constantly monitor and distinguish various motion states, including stepping, walking, running, and jumping.
    [Show full text]
  • Piezoelectric-Nanowire-Enabled Power Source for Driving Wireless Microelectronics
    ARTICLE Received 4 Jun 2010 | Accepted 23 Sep 2010 | Published 19 Oct 2010 DOI: 10.1038/ncomms1098 Piezoelectric-nanowire-enabled power source for driving wireless microelectronics Sheng Xu1, Benjamin J. Hansen1 & Zhong Lin Wang1 Harvesting energy from irregular/random mechanical actions in variable and uncontrollable environments is an effective approach for powering wireless mobile electronics to meet a wide range of applications in our daily life. Piezoelectric nanowires are robust and can be stimulated by tiny physical motions/disturbances over a range of frequencies. Here, we demonstrate the first chemical epitaxial growth of PbZrxTi1 − xO3 (PZT) nanowire arrays at 230 °C and their application as high-output energy converters. The nanogenerators fabricated using a single array of PZT nanowires produce a peak output voltage of ~0.7 V, current density of 4 µA cm − 2 and an average power density of 2.8 mW cm − 3. The alternating current output of the nanogenerator is rectified, and the harvested energy is stored and later used to light up a commercial laser diode. This work demonstrates the feasibility of using nanogenerators for powering mobile and even personal microelectronics. 1 School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA. Correspondence and requests for materials should be addressed to Z.L.W. (email: [email protected]). NATURE COMMUNICATIONS | 1:93 | DOI: 10.1038/ncomms1098 | www.nature.com/naturecommunications © 2010 Macmillan Publishers Limited. All rights reserved. ARTICLE NatUre cOMMUNicatiONS | DOI: 10.1038/ncomms1098 he search for sustainable micro/nano-powering sources for driving wireless and mobile electronics is an emerging field in today’s energy research, which could offer a fundamental solu- T 1–3 001 tion to the energy needed for driving nanodevices/nanosystems .
    [Show full text]
  • Self-Powered Multifunctional Motion Sensor Enabled by Magnetic
    Article Cite This: ACS Nano XXXX, XXX, XXX−XXX www.acsnano.org Self-Powered Multifunctional Motion Sensor Enabled by Magnetic-Regulated Triboelectric Nanogenerator † ‡ ⊥ † ⊥ † ⊥ † † † † Zhiyi Wu, , , Wenbo Ding, , Yejing Dai, , Kai Dong, Changsheng Wu, Lei Zhang, Zhiming Lin, † † § Jia Cheng, and Zhong Lin Wang*, , † School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States ‡ Engineering Research Center for Mechanical Testing Technology and Equipment of Ministry of Education, Chongqing University of Technology, Chongqing 400054, China § Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China *S Supporting Information ABSTRACT: With the fast development of the Internet of Things, the requirements of system miniaturization and integration have accelerated research on multifunctional sensors. Based on the triboelectric nanogenerator, a self-powered multifunctional motion sensor (MFMS) is proposed in this work, which is capable of detecting the motion parameters, including direction, speed, and acceleration of linear and rotary motions, simultaneously. The MFMS consists of a triboelectric nanogenerator (TENG) module, a magnetic regulation module, and an acrylic shell. The TENG module is formed by placing a free-standing magnetic disk (MD) on a polytetrafluorethylene (PTFE) plate with six copper electrodes. The movement of the MFMS causes the MD to slide on the PTFE plate and hence excites the electrodes to produce a voltage output. The carefully designed six copper electrodes (an inner circle electrode, an outer circle electrode, and four arc electrodes between them) can distinguish eight directions of movement with the acceleration and determine the rotational speed and direction as well. Besides, the magnetic regulation module is applied here by fixing a magnetic cylinder (MC) in the shell, right under the center of the PTFE plate.
    [Show full text]
  • Power Sources for Wireless Sensor Networks
    Power Sources for Wireless Sensor Networks Shad Roundy1, Dan Steingart2, Luc Frechette3, Paul Wright2, and Jan Rabaey2 1Australian National University, Department of Engineering, Canberra ACT 0200, Australia [email protected] 2University of California at Berkeley, Department of {Mechanical Engineering, Electrical Engineering and Computer Science}, Berkeley CA 94720, USA [email protected], [email protected], [email protected] 3Columbia University, Department of Mechanical Engineering , 228 S.W. Mudd Bldg, Mail Code 4703, 500 West 120th Street, New York, NY 10027-6699, USA [email protected] Abstract. Wireless sensor networks are poised to become a very significant enabling technology in many sectors. Already a few very low power wireless sensor platforms have entered the marketplace. Almost all of these platforms are designed to run on batteries that have a very limited lifetime. In order for wireless sensor networks to become a ubiquitous part of our environment, alternative power sources must be employed. This paper reviews many potential power sources for wireless sensor nodes. Well established power sources, such as batteries, are reviewed along with emerging technologies and currently untapped sources. Power sources are classified as energy reservoirs, power distribution methods, or power scavenging methods, which enable wireless nodes to be completely self-sustaining. Several sources capable of providing power on the order of 100 µW/cm3 for very long lifetimes are feasible. It is the authors’ opinion that no single power source will suffice for all applications, and that the choice of a power source needs to be considered on an application-by-application basis. 1 Introduction The vast reduction in size and power consumption of CMOS circuitry has led to a large research effort based around the vision of ubiquitous networks of wireless sensor and communication nodes [1-3].
    [Show full text]
  • Micropower Generation Using Combustion
    Micro-Power Generation Using Combustion: Issues and Approaches A. Carlos Fernandez-Pello Department of Mechanical Engineering, University of California, Berkeley Berkeley, CA 94720-1740, USA FAX: (510)642-6163 e-mail: [email protected] Colloquium: 14. New Concepts in Combustion Technology. Micro-combustors Prepared for presentation as a Topical Review at the Twenty-Ninth International Symposium on Combustion, July 21-26, 2002, Sapporo, Japan ABSTRACT The push toward the miniaturization of electro-mechanical devices and the resulting need for micro-power generation (milli-watts to watts) with low-weight, long-life devices has led to the recent development of the field of micro-scale combustion. The concept behind this new field is that since batteries have low specific energy, and liquid hydrocarbon fuels have a very high specific energy, a miniaturized power generating device, even with a relatively inefficient conversion of hydrocarbon fuels to power would result in increased lifetime and/or reduced weight of an electronic or mechanical system that currently requires batteries for power. In addition to the interest in miniaturization, the field is also driven by the potential fabrication of the devices using Micro Electro Mechanical Systems (MEMS) or rapid prototyping techniques, with their favorable characteristics for mass production and low cost. The micro-power generation field is very young, and still is in most cases in the feasibility stage. However, considering that it is a new frontier of technological development, and that only a few projects have been funded, it can be said that significant progress has been made to date. Currently there is consensus, at least among those working in the field, that combustion in the micro-scale is possible with proper thermal and chemical management.
    [Show full text]
  • IMPROVED MICROPOWER LOGIC CIRCUITS by John C
    IMPROVED MICROPOWER LOGIC CIRCUITS by John C. Sturman Lewis Research Center Cleveland, Ohio NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON, D. C. JULY 1967 TECH LIBRARY KAFB, NM I111111 lllll llll 118 II18 1111 Ill 111 0130769 NASA TN D-4052 IMPROVED MICROPOWER LOGIC CIRCUITS By John C. Sturman Lewis Research Center Cleveland, Ohio NATIONAL AERONAUTICS AND SPACE ADMINISTRATION For sale by the Clearinghouse for Federal Scientific and Technical Information Springfield, Virginia 22151 - CFSTl price $3.00 lMPROVED MICROPOWER LOGIC CIRCUITS by John C. Sturman Lewis Research Center SUMMARY Modifications to a previously reported micropower logic circuit improve its perform- ance and make possible its fabrication in monolithic form. A further improvement in power consumption was made by designing the circuit to operate from power supply volt- ages that vary with temperature. Logical gating circuits that use these techniques are discussed. These circuits were designed to operate at pulse rates of approximately 100 000 pulses per second at power levels of approximately 100 microwatts each. At reduced pulse rates, the same basic circuits can be designed to operate at power levels as low as a few microwatts per ele- ment. INTRODUCTION A steadily increasing effort is being expended to develop low-power logic circuits and semiconductor devices suitable for them. This trend has been in effect for at least 6 years, although the motivations for micropower development have changed considerably during this period. Originally, low-power circuits were necessary to provide any reason- able life for experiments on the relatively small, weight-limited satellites then available. Today, it is possible to launch much larger payloads, but the experiments they carry have become so much larger and more sophisticated that they require a vast increase in the amount of electronics.
    [Show full text]
  • Time-Resolved Open-Circuit Conductive Atomic Force Microscopy for Quantitative Analysis of Nanowire Piezoelectricity and Triboelectricity
    Time-Resolved Open-Circuit Conductive Atomic Force Microscopy for Quantitative Analysis of Nanowire Piezoelectricity and Triboelectricity Yonatan Calahorra,1∗ Wonjong Kim,2 Jelena Vukajlovic-Plestina,2 Anna Fontcuberta i Morral,23 Sohini Kar-Narayan1 1Department of Materials Science and Metallurgy University of Cambridge, CB3 0FS, Cambrdige, UK 2Laboratory of Semiconductor Materials, Institute of Materials, School of Engineering Ecole polytechnique fed´ erale´ de Lausanne (EPFL), 1015 Lausanne, Switzerland 3Institute of Physics, School of Basic Sciences Ecole polytechnique fed´ erale´ de Lausanne (EPFL), 1015 Lausanne, Switzerland ∗To whom correspondence should be addressed; E-mail: [email protected] Piezoelectric nanowires are promising materials for sensing, actuation and en- ergy harvesting, due to their enhanced properties at the nanoscale. However, quantitative characterization of piezoelectricity in nanomaterials is challeng- ing due to practical limitations and the onset of additional electromechani- cal phenomena, such as the triboelectric and piezotronic effects. Here, we present an open-circuit conductive atomic force microscopy (cAFM) method- arXiv:1908.05512v4 [cond-mat.mes-hall] 2 Oct 2019 ology for quantitative extraction of the direct axial piezoelectric coefficients of nanowires. We show, both theoretically and experimentally, that the stan- dard short-circuit cAFM mode is inadequate for piezoelectric characterization of nanowires, and that such measurements are governed by competing mech- 1 anisms. We introduce an alternative open-circuit configuration, and employ time-resolved electromechanical measurements, to distinguish between elec- trical generation mechanisms and extract the piezoelectric coefficients. This method was applied to nanowires of GaAs, an important semiconductor, with relatively low piezoelectric coefficients. The results obtained for GaAs piezo- electric coefficient, ∼0.4-1 pm/V, are in good agreement with existing knowl- edge and theory.
    [Show full text]