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Author: guangjun cheng
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1. 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

2. 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

3. 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

4. Influence of the Colloidal Environment on the Magnetic Behavior of Cobalt Nanoparticles
Published: 11/6/2007
Authors: Guangjun Cheng, Cindi L Dennis, Robert D Shull, Angela R Hight Walker
Abstract: The magnetic properties of 10 nm cobalt (Co) nanoparticles in 1,2-dicholorbenenze (DCB) are investigated via a series of magnetization (M) vs. temperature (T) measurements. A rapid rise in magnetization around 250 K during warming and a sudden drop a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841084

5. Magnetic-field-induced assemblies of cobalt nanoparticles
Published: 1/1/2005
Authors: Guangjun Cheng, Angela R Hight Walker, Gerald T Fraser, D B Romero
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103692

6. 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

7. Surface Enhanced Raman Spectroscopy in a Microfluidic Device
Published: 2/1/2004
Authors: D Dunmire, D B Romero, Guangjun Cheng, Angela R Hight Walker
Abstract: Surface enhanced Raman spectroscopy (SERS) is employed to study the solution phase vibrational structure of molecules on gold and silver colloids. Gold and silver colloids show large enhancement factors enabling sub-micromolar detection limits. Using ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841806

8. Synthesis and Characterization of Cobalt/Gold Bimetallic Nanoparticles
Published: 4/1/2007
Authors: Guangjun Cheng, Angela R Hight Walker
Abstract: Cobalt/gold (Co/Au) bimetallic nanoparticles are prepared by synthesizing Au via chemical reduction in the presence of pre-synthesized Co nanoparticles. Transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) absorption spectrometry, and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841034

9. Synthesis of Bioconjugated Magnetic Nanoparticles for Magneto-Raman Study
Published: 2/1/2004
Authors: Guangjun Cheng, D B Romero, D Dunmire, Angela R Hight Walker
Abstract: We are investigating the effects of an externally applied magnetic field on the structure and magnetic properties of biomolecules (DNA and proteins). A newly constructed, magneto-Raman confocal microscope system couples a cryo-magnet to a triple grat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841807

10. The influence of temperature on the magnetic behavior of colloidal cobalt nanoparticles
Published: 1/1/2007
Authors: C L Dennis, Guangjun Cheng, K A Baler, B B Maranville, Angela R Hight Walker, R D Shull
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=101730



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