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Author: guangjun cheng
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Displaying records 1 to 10 of 13 records.
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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

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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