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Author: Angela Hight Walker

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1. High-Speed Coherent Raman Fingerprint Imaging of Biological Tissues
Published: 7/20/2014
Authors: Charles H Camp, Young Jong Lee, John Heddleston, Christopher Michael Hartshorn, Angela R Hight Walker, Jeremy N. Rich, Justin D. Lathia, Marcus T Cicerone
Abstract: We have developed a coherent Raman imaging platform using broadband coherent anti-Stokes Raman scattering (BCARS) that provides an unprecedented combination of speed, sensitivity, and spectral breadth. The system utilizes a unique configuration of la ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914850

2. Highly reproducible and reliable metal/graphene contact by UV-Ozone treatment
Published: 3/17/2014
Authors: Wei Li, Christina Ann Hacker, Guangjun Cheng, Angela R Hight Walker, Curt A Richter, David J Gundlach, Yiran Liang, boyuan Tian, Xuelei Liang, Lianmao Peng
Abstract: Resist residue from the device fabrication process is a significant source of contamination at the metal/graphene contact interface. Ultraviolet Ozone (UVO) treatment is proven here, by X-ray photoelectron spectroscopy (XPS) and Raman measurement ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915002

3. UV/Ozone treatment to reduce metal-graphene contact resistance
Published: 5/8/2013
Authors: Wei Li, Kurt Pernstich, Angela R Hight Walker, Tian T. Shen, Guangjun Cheng, Christina Ann Hacker, Curt A Richter, Qiliang Li, David J Gundlach, Xuelei Liang, Lianmao Peng, Yiran Liang
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912639

4. Determination of graphene work function and graphene-insulator-semiconductor band alignment by internal photoemission spectroscopy
Published: 7/11/2012
Authors: Rusen Yan, Qin Q. Zhang, Wei Li, Irene G. Calizo, Tian T. Shen, Curt A Richter, Angela R Hight Walker, Xuelei X. Liang, David J Gundlach, Nhan V Nguyen, Huili Grace Xing, Alan Seabaugh
Abstract: We determined the band alignment of a graphene-oxide-silicon structure using internal photoemission spectroscopy. From the flatband voltage and Dirac voltage we infer a 4.3  10e11 cm-2 negative extrinsic charge present on the graphene surface. Als ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911396

5. Characteristics of Graphene for Quantized Hall Effect Measurements
Published: 6/1/2012
Authors: Randolph E Elmquist, Mariano A. Real, Irene G. Calizo, Brian G Bush, Tian T. Shen, Nikolai Nikolayevich Klimov, David B Newell, Angela R Hight Walker, Randall M. Feenstra
Abstract: This paper describes concepts and measurement techniques necessary for characterization of graphene in the development of graphene-based quantized Hall effect (QHE) devices and resistance standards. We briefly contrast the properties of graphene prod ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910365

6. Relationship between Length and Surface-Enhanced Raman Spectroscopy signal Strength in Metal Nanoparticle Chains: Idea Models versus Nanofabrication
Published: 1/18/2012
Authors: Angela R Hight Walker, K. Stec, Shunpig Zhang, Hongxing Xu, Rene Lopez
Abstract: We have employed capillary force deposition on ion beam patterned substrates to fabricate chains of 60nm gold nanospheres ranging in length from 1 to 9 nanoparticles. Measurements of the surface-averaged SERS enhancement factor strength for these cha ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911269

7. Towards clean and crackless transfer of graphene
Published: 1/2/2012
Authors: Xuelei X. Liang, Brent A Sperling, Irene G. Calizo, Guangjun Cheng, Christina Ann Hacker, Qin Q. Zhang, Yaw S Obeng, Kai Yan, Hailin Peng, Qiliang Li, Xiaoxiao Zhu, Hui Yuan, Angela R Hight Walker, Zhongfan Liu, Lianmao Peng, Curt A Richter
Abstract: We present the results of a thorough study of wet chemical methods for transferring chemical vapor deposition grown graphene from the metal growth substrate to a device compatible substrate. Based on these results, we have developed a ,modified RCA c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908399

8. A Highly Practical Route for Large-Area, Single Layer Graphene from Liquid Carbon Sources such as Benzene and Methanol
Published: 10/28/2011
Authors: Gadipelli Srinivas, Irene G. Calizo, Jamie Ford, Guangjun Cheng, Angela R Hight Walker, Taner Yildirim
Abstract: Through a detailed systematic study, we determined the parameters critical for high-quality, single-layer graphene formation and developed a straightforward synthesis that requires no explosive hydrogen or methane gas flow. The synthesis is further ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907820

9. Evolution of Microscopic Localization in Graphene in a Magnetic Field: From Scattering Resonances to Quantum Dots.
Published: 1/9/2011
Authors: Suyong S. Jung, Gregory M. Rutter, Nikolai Nikolayevich Klimov, David B Newell, Irene G. Calizo, Angela R Hight Walker, Nikolai B Zhitenev, Joseph A Stroscio
Abstract: Graphene is a unique material displaying high-mobility transport in monolayer-thin films. However, its properties are strongly dependent on interactions with substrates, local charges and environment. Scanned probe microscopies can be used to local ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905753

10. Monodisperse Gold-Copper bimetallic Nanocubes: Facile One-Step Synthesis with Controllable Sizes and Compositions
Published: 8/16/2010
Authors: Yonglin Liu, Angela R Hight Walker
Abstract: We demonstrate a one-pot polyol strategy for the synthesis of Au - Cu perfect nanocubes. To the best of the authors knowledge, this represents the first-time production of Au - Cu bimetallic nanocubes. By carefully adjusting the reaction parameter ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904214



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