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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. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. Separation and Characterization of Double Wall Carbon Nanotube Sub-Populations
Published: 7/8/2010
Authors: JiYeon Huh, Angela R Hight Walker, Hyun W. Ro, Jan Obrzut, Jeffrey A Fagan
Abstract: We present the separation of surfactant encapsulated double wall carbon nanotubes (DWCNTs) synthesized by the high pressure carbon monoxide decomposition (HiPco) process by length and electronic characteristics using density gradient ultracentrifugat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903752



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