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You searched on: Author: angela hight walker Sorted by: date

Displaying records 1 to 10 of 80 records.
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1. Raman analysis of bond conformations in the rotator and premelting states of normal alkanes
Published: 5/9/2016
Authors: Anthony Patrick Kotula, Angela R Hight Walker, Kalman D Migler
Abstract: We perform Raman spectroscopic measurements on normal alkanes (C^dn^H^d2n+2^) with 21 {less than or equal to} n {less than or equal to} 60 with a specific focus on the conformational disorder that occurs below the melt temperature. We employ a three- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919768

2. Detecting Carbon in Carbon: Application of Differential Charging to Obtain Information on the Chemical Identity and Spatial Location of Carbon Nanotube Aggregates in Composites by Imaging X-ray Photoelectron Spectroscopy
Published: 10/24/2015
Authors: Justin M Gorham, William A Osborn, Jeremiah W Woodcock, Keana C K Scott, John Michael Heddleston, Angela R Hight Walker, Jeffrey W Gilman
Abstract: The surface contributions and dispersion properties of multiwalled carbon nanotubes (MWCNT) within a composite are important measurements to perform on nano-enabled products in order to help answer environmental health and safety questions associated ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918341

3. Mesomorphic Pathway in Early Stage Crystallization of Polyethylene
Published: 6/18/2015
Authors: Kalman D Migler, Angela R Hight Walker, Anthony Patrick Kotula
Abstract: The kinetic pathway by which a molten polymer transforms into a multi-length scale semi-crystalline structure upon cooling is an unsolved problem in polymer physics, yet it is critical to the processing, properties and ultimate performance of these m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917498

4. Influence of Metal¿MoS2 Interface on MoS2 Transistor Performance: Comparison of Ag and Ti Contacts
Published: 12/16/2014
Authors: Hui H. Yuan, Guangjun Cheng, Lin You, Haitao Li, Hao Zhu, Wei Li, Joseph J Kopanski, Yaw S Obeng, Angela R Hight Walker, David J Gundlach, Curt A Richter, D. E Ioannou, Qiliang Li
Abstract: In this work, we present a study of enhancing MoS2 transistor performance by using proper metal contact. We found that the on-state current of MoS2 field-effect transistors with 30 nm Au/ 30 nm Ag contacts is enhanced more than 60 times and the subth ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916101

5. High-Speed Coherent Raman Fingerprint Imaging of Biological Tissues
Published: 7/20/2014
Authors: Charles H Camp, Young Jong Lee, John Michael 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

6. 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

7. 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

8. 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

9. 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

10. 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



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