Silver-Based Plasmonic Nanoparticles for and Their Use in Biosensing
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Plasmonic Colloidal Nanoparticles with Open Eccentric Cavities Via Acid-Induced Chemical Transformation
View metadata, citation and similar papers at core.ac.uk brought to you by CORE NPG Asia Materials (2015) 7, e167; doi:10.1038/am.2015.15 OPEN & 2015 Nature Publishing Group All rights reserved 1884-4057/15 www.nature.com/am ORIGINAL ARTICLE Plasmonic colloidal nanoparticles with open eccentric cavities via acid-induced chemical transformation Won Joon Cho1,5, Alum Jung2,5, Suenghoon Han2, Sung-Min Lee3, Taewook Kang4, Kun-Hong Lee2, Kyung Cheol Choi3 and Jin Kon Kim1 Surface-enhanced Raman spectroscopy (SERS) has been considered a promising technique for the detection of trace molecules in biomedicine and environmental monitoring. The ideal metal nanoparticles for SERS must not only fulfill important requirements such as high near-field enhancement and a tunable far-field response but also overcome the diffusion limitation at extremely lower concentrations of a target material. Here, we introduce a novel method to produce gold nanoparticles with open eccentric cavities by selectively adapting the structure of non-plasmonic nanoparticles via acid-mediated surface replacement. Copper oxide nanoparticles with open eccentric cavities are first prepared using a microwave-irradiation-assisted surfactant-free hydrothermal reaction and are then transformed into gold nanoparticles by an acidic gold precursor while maintaining their original structure. Because of the strong near-field enhancement occurring at the mouth of the open cavities and the very rough surfaces resulting from the uniformly covered hyperbranched sharp multi-tips and the free access of SERS molecules inside of the nanoparticles without diffusion limitation, adenine, one of the four bases in DNA, in an extremely diluted aqueous solution (1.0 pM) was successfully detected with excellent reproducibility upon laser excitation with a 785-nm wavelength. -
Plasmofluidic Single-Molecule Surface-Enhanced Raman
ARTICLE Received 24 Feb 2014 | Accepted 9 Jun 2014 | Published 7 Jul 2014 DOI: 10.1038/ncomms5357 Plasmofluidic single-molecule surface-enhanced Raman scattering from dynamic assembly of plasmonic nanoparticles Partha Pratim Patra1, Rohit Chikkaraddy1, Ravi P.N. Tripathi1, Arindam Dasgupta1 & G.V. Pavan Kumar1 Single-molecule surface-enhanced Raman scattering (SM-SERS) is one of the vital applications of plasmonic nanoparticles. The SM-SERS sensitivity critically depends on plasmonic hot-spots created at the vicinity of such nanoparticles. In conventional fluid-phase SM-SERS experiments, plasmonic hot-spots are facilitated by chemical aggregation of nanoparticles. Such aggregation is usually irreversible, and hence, nanoparticles cannot be re-dispersed in the fluid for further use. Here, we show how to combine SM-SERS with plasmon polariton-assisted, reversible assembly of plasmonic nanoparticles at an unstructured metal–fluid interface. One of the unique features of our method is that we use a single evanescent-wave optical excitation for nanoparticle assembly, manipulation and SM-SERS measurements. Furthermore, by utilizing dual excitation of plasmons at metal–fluid interface, we create interacting assemblies of metal nanoparticles, which may be further harnessed in dynamic lithography of dispersed nanostructures. Our work will have implications in realizing optically addressable, plasmofluidic, single-molecule detection platforms. 1 Photonics and Optical Nanoscopy Laboratory, h-cross, Indian Institute of Science Education and Research, Pune 411008, India. Correspondence and requests for materials should be addressed to G.V.P.K. (email: [email protected]). NATURE COMMUNICATIONS | 5:4357 | DOI: 10.1038/ncomms5357 | www.nature.com/naturecommunications 1 & 2014 Macmillan Publishers Limited. All rights reserved. -
Generation and Stability of Size-Adjustable Bulk Nanobubbles
www.nature.com/scientificreports OPEN Generation and Stability of Size-Adjustable Bulk Nanobubbles Based on Periodic Pressure Received: 10 September 2018 Accepted: 18 December 2018 Change Published: xx xx xxxx Qiaozhi Wang, Hui Zhao, Na Qi, Yan Qin, Xuejie Zhang & Ying Li Recently, bulk nanobubbles have attracted intensive attention due to the unique physicochemical properties and important potential applications in various felds. In this study, periodic pressure change was introduced to generate bulk nanobubbles. N2 nanobubbles with bimodal distribution and excellent stabilization were fabricated in nitrogen-saturated water solution. O2 and CO2 nanobubbles have also been created using this method and both have good stability. The infuence of the action time of periodic pressure change on the generated N2 nanobubbles size was studied. It was interestingly found that, the size of the formed nanobubbles decreases with the increase of action time under constant frequency, which could be explained by the diference in the shrinkage and growth rate under diferent pressure conditions, thereby size-adjustable nanobubbles can be formed by regulating operating time. This study might provide valuable methodology for further investigations about properties and performances of bulk nanobubbles. Nanobubbles are gaseous domains which could be found at the solid/liquid interface or in solution, known as surface nanobubbles (SNBs)1,2 and bulk nanobubbles (BNBs)3, respectively. For BNBs, generally recognized as spherical bubbles with the diameter of less than 1μm surrounded by liquid, though it has been observed frstly in 19814, the existence of long-lived BNBs is still a controversial subject as it is contrary to the classical theory5,6. -
Graphene Plasmonics: Physics and Potential Applications
Graphene plasmonics: Physics and potential applications Shenyang Huang1,2, Chaoyu Song1,2, Guowei Zhang1,2, and Hugen Yan1,2* 1Department of Physics, State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China 2Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China *Email: [email protected] Abstract Plasmon in graphene possesses many unique properties. It originates from the collective motion of massless Dirac fermions and the carrier density dependence is distinctively different from conventional plasmons. In addition, graphene plasmon is highly tunable and shows strong energy confinement capability. Most intriguing, as an atom-thin layer, graphene and its plasmon are very sensitive to the immediate environment. Graphene plasmons strongly couple to polar phonons of the substrate, molecular vibrations of the adsorbates, and lattice vibrations of other atomically thin layers. In this review paper, we'll present the most important advances in grapene plasmonics field. The topics include terahertz plasmons, mid-infrared plasmons, plasmon-phonon interactions and potential applications. Graphene plasmonics opens an avenue for reconfigurable metamaterials and metasurfaces. It's an exciting and promising new subject in the nanophotonics and plasmonics research field. 1 Introduction Graphene is a fascinating electronic and optical material and the study for graphene started with its magneto-transport measurements and an anomalous Berry phase[1, 2]. Optical properties of graphene attracted more and more attention later on. Many exciting developments have been achieved, such as universal optical conductivity[3], tunable optical absorption[4, 5] and strong terahertz response[6]. Most importantly, as an interdisciplinary topic, plasmon in graphene has been the major focus of graphene photonics in recent years. -
Review Article Importance of Molecular Interactions in Colloidal Dispersions
Hindawi Publishing Corporation Advances in Condensed Matter Physics Volume 2015, Article ID 683716, 8 pages http://dx.doi.org/10.1155/2015/683716 Review Article Importance of Molecular Interactions in Colloidal Dispersions R. López-Esparza,1,2 M. A. Balderas Altamirano,1 E. Pérez,1 and A. Gama Goicochea1,3 1 Instituto de F´ısica, Universidad Autonoma´ de San Luis Potos´ı, 78290 San Luis Potos´ı, SLP, Mexico 2Departamento de F´ısica, Universidad de Sonora, 83000 Hermosillo, SON, Mexico 3Innovacion´ y Desarrollo en Materiales Avanzados A. C., Grupo Polynnova, 78211 San Luis Potos´ı, SLP, Mexico Correspondence should be addressed to A. Gama Goicochea; [email protected] Received 21 May 2015; Accepted 2 August 2015 Academic Editor: Jan A. Jung Copyright © 2015 R. Lopez-Esparza´ et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We review briefly the concept of colloidal dispersions, their general properties, and some of their most important applications, as well as the basic molecular interactions that give rise to their properties in equilibrium. Similarly, we revisit Brownian motion and hydrodynamic interactions associated with the concept of viscosity of colloidal dispersion. It is argued that the use of modern research tools, such as computer simulations, allows one to predict accurately some macroscopically measurable properties by solving relatively simple models of molecular interactions for a large number of particles. Lastly, as a case study, we report the prediction of rheological properties of polymer brushes using state-of-the-art, coarse-grained computer simulations, which are in excellent agreement with experiments. -
Colloidal Crystal: Emergence of Long Range Order from Colloidal Fluid
Colloidal Crystal: emergence of long range order from colloidal fluid Lanfang Li December 19, 2008 Abstract Although emergence, or spontaneous symmetry breaking, has been a topic of discussion in physics for decades, they have not entered the set of terminologies for materials scientists, although many phenomena in materials science are of the nature of emergence, especially soft materials. In a typical soft material, colloidal suspension system, a long range order can emerge due to the interaction of a large number of particles. This essay will first introduce interparticle interactions in colloidal systems, and then proceed to discuss the emergence of order, colloidal crystals, and finally provide an example of applications of colloidal crystals in light of conventional molecular crystals. 1 1 Background and Introduction Although emergence, or spontaneous symmetry breaking, and the resultant collective behav- ior of the systems constituents, have manifested in many systems, such as superconductivity, superfluidity, ferromagnetism, etc, and are well accepted, maybe even trivial crystallinity. All of these phenonema, though they may look very different, share the same fundamental signature: that the property of the system can not be predicted from the microscopic rules but are, \in a real sense, independent of them. [1] Besides these emergent phenonema in hard condensed matter physics, in which the interaction is at atomic level, interactions at mesoscale, soft will also lead to emergent phenemena. Colloidal systems is such a mesoscale and soft system. This size scale is especially interesting: it is close to biogical system so it is extremely informative for understanding life related phenomena, where emergence is origin of life itself; it is within visible light wavelength, so that it provides a model system for atomic system with similar physics but probable by optical microscope. -
7 Plasmonics
7 Plasmonics Highlights of this chapter: In this chapter we introduce the concept of surface plasmon polaritons (SPP). We discuss various types of SPP and explain excitation methods. Finally, di®erent recent research topics and applications related to SPP are introduced. 7.1 Introduction Long before scientists have started to investigate the optical properties of metal nanostructures, they have been used by artists to generate brilliant colors in glass artefacts and artwork, where the inclusion of gold nanoparticles of di®erent size into the glass creates a multitude of colors. Famous examples are the Lycurgus cup (Roman empire, 4th century AD), which has a green color when observing in reflecting light, while it shines in red in transmitting light conditions, and church window glasses. Figure 172: Left: Lycurgus cup, right: color windows made by Marc Chagall, St. Stephans Church in Mainz Today, the electromagnetic properties of metal{dielectric interfaces undergo a steadily increasing interest in science, dating back in the works of Gustav Mie (1908) and Rufus Ritchie (1957) on small metal particles and flat surfaces. This is further moti- vated by the development of improved nano-fabrication techniques, such as electron beam lithographie or ion beam milling, and by modern characterization techniques, such as near ¯eld microscopy. Todays applications of surface plasmonics include the utilization of metal nanostructures used as nano-antennas for optical probes in biology and chemistry, the implementation of sub-wavelength waveguides, or the development of e±cient solar cells. 208 7.2 Electro-magnetics in metals and on metal surfaces 7.2.1 Basics The interaction of metals with electro-magnetic ¯elds can be completely described within the frame of classical Maxwell equations: r ¢ D = ½ (316) r ¢ B = 0 (317) r £ E = ¡@B=@t (318) r £ H = J + @D=@t; (319) which connects the macroscopic ¯elds (dielectric displacement D, electric ¯eld E, magnetic ¯eld H and magnetic induction B) with an external charge density ½ and current density J. -
Universality in Spectral Condensation Induja Pavithran1, Vishnu R
www.nature.com/scientificreports OPEN Universality in spectral condensation Induja Pavithran1, Vishnu R. Unni2*, Alan J. Varghese3, D. Premraj3, R. I. Sujith3,4*, C. Vijayan1, Abhishek Saha2, Norbert Marwan4 & Jürgen Kurths4,5,6 Self-organization is the spontaneous formation of spatial, temporal, or spatiotemporal patterns in complex systems far from equilibrium. During such self-organization, energy distributed in a broadband of frequencies gets condensed into a dominant mode, analogous to a condensation phenomenon. We call this phenomenon spectral condensation and study its occurrence in fuid mechanical, optical and electronic systems. We defne a set of spectral measures to quantify this condensation spanning several dynamical systems. Further, we uncover an inverse power law behaviour of spectral measures with the power corresponding to the dominant peak in the power spectrum in all the aforementioned systems. During self-organization, an ordered pattern emerges from an initially disordered state. In dynamical systems, a pattern can be any regularly repeating arrangements in space, time or both1. For example, a laser emits random wave tracks like a lamp until the critical pump power, above which the laser emits light as a single coherent wave track with high-intensity2. A macroscopic change is observed in the laser system as a long-range pattern emerges in time. Another example is the Rayleigh–Bénard system. For lower temperature gradients, the fuid parcels move randomly. As the temperature gradient is increased, a rolling motion sets in and the fuid parcels behave coherently to form spatially extended patterns. Te initial random pattern can be regarded as a superposition of a variety of oscillatory modes and eventually some oscillatory modes dominate, resulting in the emergence of a spatio-temporal pattern3,4. -
Surface Plasmon Resonance Study of the Purple Gold
SURFACE PLASMON RESONANCE STUDY OF THE PURPLE GOLD (AuAl2) INTERMETALLIC, pH-RESPONSIVE FLUORESCENCE GOLD NANOPARTICLES, AND GOLD NANOSPHERE ASSEMBLY Panupon Samaimongkol Dissertation submitted to the faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy In Physics Hans D. Robinson, Chair Giti Khodaparast Chenggang Tao Webster Santos June 22, 2018 Blacksburg, Virginia Keywords: Surface plasmons (SPs), Localized surface plasmon resonances (LSPRs), Kretschmann configuration, Surface plasmon-enhanced fluorescence (PEF) spectroscopy, Self-Assembly, Nanoparticles Copyright 2018, Panupon Samaimongkol i SURFACE PLASMON RESONANCE STUDY OF THE PURPLE GOLD (AuAl2) INTERMETALLIC, pH-RESPONSIVE FLUORESCENCE GOLD NANOPARTICLES, AND GOLD NANOSPHERE ASSEMBLY Panupon Samaimongkol ABSTRACT (academic) In this dissertation, I have verified that the striking purple color of the intermetallic compound AuAl2, also known as purple gold, originates from surface plasmons (SPs). This contrasts to a previous assumption that this color is due to an interband absorption transition. The existence of SPs was demonstrated by launching them in thin AuAl2 films in the Kretschmann configuration, which enables us to measure the SP dispersion relation. I observed that the SP energy in thin films of purple gold is around 2.1 eV, comparable to previous work on the dielectric function of this material. Furthermore, SP sensing using AuAl2 also shows the ability to measure the change in the refractive index of standard sucrose solution. AuAl2 in nanoparticle form is also discussed in terms of plasmonic applications, where Mie scattering theory predicts that the particle bears nearly uniform absorption over the entire visible spectrum with an order magnitude higher absorption than efficient light-absorbing carbonaceous particle also known a carbon black. -
Polymer Colloid Science
Polymer Colloid Science Jung-Hyun Kim Ph. D. Nanosphere Process & Technology Lab. Department of Chemical Engineering, Yonsei University National Research Laboratory Project the financial support of the Korea Institute of S&T Evaluation and Planning (KISTEP) made in the program year of 1999 기능성 초미립자 공정연구실 Colloidal Aspects 기능성 초미립자 공정연구실 ♣ What is a polymer colloids ? . Small polymer particles suspended in a continuous media (usually water) . EXAMPLES - Latex paints - Natural plant fluids such as natural rubber latex - Water-based adhesives - Non-aqueous dispersions . COLLOIDS - The world of forgotten dimensions - Larger than molecules but too small to be seen in an optical microscope 기능성 초미립자 공정연구실 ♣ What does the term “stability/coagulation imply? . There is no change in the number of particles with time. A system is said to be colloidally unstable if collisions lead to the formation of aggregates; such a process is called coagulation or flocculation. ♣ Two ways to prevent particles from forming aggregates with one another during their colliding 1) Electrostatic stabilization by charged group on the particle surface - Origin of the charged group - initiator fragment (COOH, OSO3 , NH4, OH, etc) ionic surfactant (cationic or anionic) ionic co-monomer (AA, MAA, etc) 2) Steric stabilization by an adsorbed layer of some substance 3) Solvation stabilization 기능성 초미립자 공정연구실 기능성 초미립자 공정연구실 Stabilization Mechanism Electrostatic stabilization - Electrostatic stabilization Balancing the charge on the particle surface by the charges on small ions -
Plasmonic Nanoparticles in Chemical Analysis
RSC Advances REVIEW View Article Online View Journal | View Issue Plasmonic nanoparticles in chemical analysis Jan Krajczewski, Karol Koła˛taj and Andrzej Kudelski* Cite this: RSC Adv.,2017,7, 17559 Many very sensitive analytical methods utilising specific properties of plasmonic metal nanoparticles have been developed. Some of these techniques are so sensitive that observation of the reliable signal even from a single molecule of the analyte is possible. In this review article we present the most important analytical techniques based on the plasmonic properties of selected metal nanoparticles and the basic theoretical background of these analytical techniques, including the mechanism of the interaction of the electromagnetic radiation with the plasmonic nanoparticles. The analytical techniques presented in this article include methods based on the change of the optical properties of plasmonic nanoparticles caused by analyte-induced aggregation, etching or the change of the growth of plasmonic nanoparticles, and techniques utilising increased efficiency of some optical processes in the proximity of the plasmonic nanoparticles, e.g. surface-enhanced Raman scattering (SERS), surface enhanced infra-red Received 23rd January 2017 absorption (SEIRA), and metal enhanced fluorescence (MEF). Recently, an observed increase in the Accepted 16th March 2017 Creative Commons Attribution-NonCommercial 3.0 Unported Licence. number of applications of techniques utilising surface plasmon resonance for the analysis of various DOI: 10.1039/c7ra01034f industrial, biological, medical, and environmental samples allows us to predict a large increase of the rsc.li/rsc-advances significance of these techniques in the near future. 1. Introduction intensive colour of suspensions of Ag and Au nanoparticles was the reason for using these materials in ancient times. -
Towards Deep Integration of Electronics and Photonics
applied sciences Review Towards Deep Integration of Electronics and Photonics Ivan A. Pshenichnyuk 1,* , Sergey S. Kosolobov 1 and Vladimir P. Drachev 1,2,* 1 Skolkovo Institute of Science and Technology, Center for Photonics and Quantum Materials, Nobelya 3, 121205 Moscow, Russia; [email protected] 2 Department of Physics, University of North Texas,1155 Union Circle, Denton, TX 76203, USA * Correspondence: [email protected] (I.A.P.); [email protected] (V.P.D.) Received: 15 September 2019; Accepted: 5 November 2019; Published: 12 November 2019 Abstract: A combination of computational power provided by modern MOSFET-based devices with light assisted wideband communication at the nanoscale can bring electronic technologies to the next level. Obvious obstacles include a size mismatch between electronic and photonic components as well as a weak light–matter interaction typical for existing devices. Polariton modes can be used to overcome these difficulties at the fundamental level. Here, we review applications of such modes, related to the design and fabrication of electro–optical circuits. The emphasis is made on surface plasmon-polaritons which have already demonstrated their value in many fields of technology. Other possible quasiparticles as well as their hybridization with plasmons are discussed. A quasiparticle-based paradigm in electronics, developed at the microscopic level, can be used in future molecular electronics and quantum computing. Keywords: plasmon; light-matter interaction; photonics; nano-electronics; quasiparticle 1. Introduction Further achievements in electronics and photonics imply their better integration. Usage of photons at the level of circuits and single chips has a huge potential to improve modern intelligent systems [1].