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Author: angela hight walker

Displaying records 11 to 20 of 75 records.
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11. 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

12. Facile One-Pot Synthesis of Metal-Semiconductor Hybrid Nanocrystals via Chemical Transformation: The Case of Cu-CuxS Heterodimers and Hetero-Oligomers
Published: 3/18/2010
Authors: Yonglin Liu, Angela R Hight Walker
Abstract: Metal-semiconductor hybrid nanocrystals (HNCs) hold great potential in the fields of photocatalysis, biomedical imaging, and anticancer nanomedicine. However, their chemical synthetic procedures remain complex and challenging. Here, we apply chemical ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903039

13. Sample Preparation Protocols for Realization of Reproducible Characterization of Single-walled Carbon Nanotubes
Published: 12/1/2009
Authors: Angela R Hight Walker, Jeffrey A Fagan, Stephanie A Hooker, Michael T Postek, Stephen A Wise, Andras Vladar, Rolf Louis Zeisler
Abstract: Harmonized sample pre-treatment is an integral first step in ensuring metrological quality of measurements as regards repeatability, inter-laboratory reproducibility and commutability. The development of standard preparation methods for SWCNT sample ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901229

14. The effect of dispersant on defects in length-separated single-wall carbon nanotubes measured by Raman spectroscopy
Published: 11/1/2009
Authors: Jeffrey Ray Simpson, Jeffrey A Fagan, Matthew Becker, Erik K. Hobbie, Angela R Hight Walker
Abstract: The fluorescence quantum yield of single-wall carbon nanotubes (SWCNTs) in solution depends dramatically on dispersant. To evaluate the role of defects in this dependence, we compare Raman spectra from aqueous suspensions of SWCNTs dispersed using ei ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842611

15. Multimodal, Nanoscale, Hyperspectral Imaging Demonstrated on Heterostructures of Quantum Dots and DNA-Wrapped Single-Wall Carbon Nanotubes
Published: 10/21/2009
Authors: Hyeong Gon Kang, Matthew Lawrence Clarke, Jianyong Tang, John Taylor Woodward IV, Shin G. Chou, Zhenping Zhou, Angela R Hight Walker, Tinh Nguyen, Jeeseong Hwang
Abstract: A multimodality imaging technique integrating atomic force, polarized Raman, and fluorescence lifetime microscopy and a 2D autocorrelation image analysis is applied to study the properties of a mesoscopic heterostucture of nanoscale materials. This ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902938

16. Probing the Growth and Aging of Colloidal Cobalt Nanoparticles
Published: 6/11/2009
Authors: Guangjun Cheng, Cindi L Dennis, Robert D Shull, Angela R Hight Walker
Abstract: We have combined transmission electron microscopy (TEM) and magnetic measurements to characterize the growth of colloidal cobalt (Co) nanoparticles during synthesis and their subsequent stability in air. During the growth, TEM measurements have shown ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842608

17. Dipolar Chains formed by synthesized cobalt nanocubes
Published: 5/11/2009
Authors: Guangjun Cheng, Robert D Shull, Angela R Hight Walker
Abstract: Cobalt nanocubes with an average edge length of 50 nm and the epsilon crystalline structure were synthesized via thermo-decomposition in 1,2-dichlorobenzene at 120 oC in the presence of the surfactants. These nanocubes form dipolar chains upon drying ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842508

18. Towards optimization and characterization of dye-embedded gold nanoclusters for multiplexed optical imaging
Published: 2/26/2009
Authors: Michael A. McDonald, Angela R Hight Walker
Abstract: Metallic nanoparticle aggregates coupling strong surface plasmons with a Raman reporter molecule have been developed for application in multiplexed optical imaging. Of interest to our work is the ability of the agents to serve as surface-enhanced Ram ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901384

19. Transmission electron microscopy characterization of colloidal copper nanoparticles and their chemical reactivity
Published: 2/16/2009
Authors: Guangjun Cheng, Angela R Hight Walker
Abstract: A colloidal synthesis route was developed to produce face-centered cubic (fcc) copper (Cu) nanoparticles in the presence of the surfactants in an organic solvent under an argon environment. Various synthetic conditions have been explored to control t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903450

20. Centrifugal Length Separation of Carbon Nanotubes
Published: 10/1/2008
Authors: Jeffrey A Fagan, Matthew Becker, Jae H. Chun, Barry J. Bauer, Jeffrey Ray Simpson, Angela R Hight Walker, Erik K. Hobbie
Abstract: Separation of single wall carbon nanotubes (SWCNTs) by length via centrifugation in a high density medium, and the characterization of both the separated fractions and the centrifugation process are presented. Significant quantities of the separated ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853635



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