High-Quality Graphene and Hexagonal- Boron Nitride Transfers on Sio2

High-Quality Graphene and Hexagonal- Boron Nitride Transfers on SiO2

MELISSA HUYNH CHEMICAL ENGINEERING DEPARTMENT OF OREGON STATE UNIVERSITY DR. JUN JIAO, LESTER LAMPERT REU - PORTLAND STATE UNIVERSITY Overview

Importance

High- Results and Quality Methodology Interpretation Graphene & HBN

Raman Analysis Overview

Importance

High- Results and Quality Methodology Interpretation Graphene & HBN

Raman Analysis 2D Materials

 Graphene  Zero overlap semimetal  Durable  Heat and electricity conductivity  Hexagonal-Boron Nitride  Similar properties to graphene Future Application

 Biological engineering

 Optical Electronics

 Composite materials

 Super Capacitors/ Energy Storage Overview

Importance

High- Results and Quality Methodology Interpretation Graphene & HBN

Raman Analysis Growth

 Chemical Vapor Deposition (CVD)  Copper catalyst  Vertical growth with furnace  Methane, hydrogen, argon gases Transfer of Graphene

 PMMA spin coat  Ammonium Persulfate (APS)  Rinse  Heat  Acetone bath Transfer of HBN

 Copper foil  APS  Corral  Pumps Polymer-Free Approach

10  Similar to H-BN  Outflow: APS  Inflow: DI H2O and Isopropyl Alcohol Overview

Importance

High- Results and Quality Methodology Interpretation Graphene & HBN

Raman Analysis Graphene Spectrum

 D band  G band  D/g  2D Band  2D/G  Ideal Spectrum HBN spectrum

 1300-1400 range  Weak readings  Carbon contamination

 Ideal Spectrum Overview

Importance

High-

Results and Quality Methodology Interpretation Graphene & HBN

Raman Analysis Graphene Analysis

Grown at 830 ̊ C [edge] Grown at 840 ̊ C [edge]

Grown at 850 ̊ C [center] 15 Graphene Analysis

16 Graphene Center at 750 ̊C Graphene Edge at 750 ̊C 14000 18000 16000 12000 14000 10000 12000 8000 10000 Intensity Intensity 8000 6000 6000 4000 4000 2000 2000 0 0 1000 1500 2000 2500 3000 1000 1500 2000 2500 3000 Raman Shift (cm−1) Raman Shift (cm−1)

Graphene Center at 850 ̊C Graphene Edge at 850 C̊ 10000 9000 9000 8000 8000 7000 7000 6000 6000 5000 Intensity 5000 Intensity 4000 4000 3000 3000 2000 2000 1000 1000 0 0 1000 1500 2000 2500 3000 1000 1500 2000 2500 3000 Raman Shift (cm−1) Raman Shift (cm−1) Graphene Analysis

17 Intensity vs. Temperature Intensity vs. Temperature (center) (edge) 1.5 2

1.5 1 Intensity Intensity 1 d/g d/g 0.5 2d/g 0.5 2d/g 0 0 700 750 800 850 700 750 800 850 Temperature ( ̊ C) Temperature ( ̊ C) HWHM vs. Temperature HWHM vs Temperature (center) (edge) 180 180 160 160 140 140 120 120 100 hwhm(cm−1) 100 hwhm(cm−1) 2D 2D 80 80 60 G 60 G 40 D 40 D 20 20 0 0 700 750 800 850 700 750 800 850 Temperature ( ̊ C) Temperature ( ̊ C) H-BN Analysis

H-BN Raman Spectrum (100x) 2900

2800

2700

2600

2500 Intensity H-BN 10x 2400

2300

2200

2100

2000 1250 1300 1350 1400 1450 1500 Raman Shift (cm−1)

H-BN 100x Towards Ideality

 Corral adjustments

 Polymer-free transfer

 Particle prevention Acknowledgments

 Pete and Rosalie Johnson  Dr. Skip Rochefort  Dr. Jun Jiao  Dr. Erik Sanchez  Lester Lampert  Ellie Bradley  NSF References  http://www.slideshare.net/agarwalarpit2050/graphene-and-its-future- applications  http://www.graphenea.com/pages/graphene-uses- applications#.Vc1MFPlViko  http://www.electrochem.org/dl/interface/spr/spr11/spr11_p045-046.pdf  http://engineering.columbia.edu/even-defects-graphene-strongest-material- world  http://accuratus.com/boron.html  http://physastro.pomona.edu/wp- content/uploads/2012/09/thesis_pollard.pdf Images  http://previews.123rf.com/images/ngad/ngad1503/ngad150300120/40807 836-finger-touch-screen-of-phone-on-green-rice-background-Stock- Photo.jpg  https://www.bnl.gov/today/body_pics/2014/07/dist-structures-hr.jpg  http://www.azom.com/images/Article_Images/ImageForArticle_10130(2).j pg  http://cdn.shopclues.net/images/detailed/4609/09112010851_1400496988 .jpg  http://www.intohigher.com/media/2340333/osu_vertical_logo.jpg  http://www.nsf.gov/

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