نتایج جستجو برای: nitrogen doping

تعداد نتایج: 143598  

2015
M. Kaukonen R. M. Nieminen S. Pöykkö Ari P. Seitsonen

Rights: © 1999 American Physical Society (APS). This is the accepted version of the following article: Kaukonen, M. & Nieminen, Risto M. & Pöykkö, S. & Seitsonen, Ari P. 1999. Nitrogen Doping of Amorphous Carbon Surfaces. Physical Review Letters. Volume 83, Issue 25. 5346-5349. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.83.5346, which has been published in final form at http://journals....

Journal: :Physical chemistry chemical physics : PCCP 2015
Philomena Schlexer Antonio Ruiz Puigdollers Gianfranco Pacchioni

The charge state of Ag and Au atoms and clusters (Ag4 and Au4, Ag5 and Au5) adsorbed on defective TiO2 anatase(101) and tetragonal ZrO2(101) has been systematically investigated as a function of oxide doping and defectivity using a DFT+U approach. As intrinsic defects, we have considered the presence of oxygen vacancies. As extrinsic defects, substitutional nitrogen- and niobium-doping have bee...

2015
Bin Guan Hamidreza Siampour Zhao Fan Shun Wang Xiang Yang Kong Abdelmadjid Mesli Jian Zhang Yaping Dan

This Report presents a nitrogen-doping method by chemically forming self-assembled monolayers on silicon. Van der Pauw technique, secondary-ion mass spectroscopy and low temperature Hall effect measurements are employed to characterize the nitrogen dopants. The experimental data show that the diffusion coefficient of nitrogen dopants is 3.66 × 10(-15) cm(2) s(-1), 2 orders magnitude lower than ...

2016
Jia Zhang Chao Zhao Na Liu Huanxi Zhang Jingjing Liu Yong Qing Fu Bin Guo Zhenlong Wang Shengbin Lei PingAn Hu

Single-layer and mono-component doped graphene is a crucial platform for a better understanding of the relationship between its intrinsic electronic properties and atomic bonding configurations. Large-scale doped graphene films dominated with graphitic nitrogen (GG) or pyrrolic nitrogen (PG) were synthesized on Cu foils via a free radical reaction at growth temperatures of 230-300 °C and 400-60...

2015
Russell Canty Edwin Gonzalez Caleb MacDonald Sebastian Osswald Hugo Zea Claudia C. Luhrs

Graphene sheets doped with nitrogen were produced by the reduction-expansion (RES) method utilizing graphite oxide (GO) and urea as precursor materials. The simultaneous graphene generation and nitrogen insertion reactions are based on the fact that urea decomposes upon heating to release reducing gases. The volatile byproducts perform two primary functions: (i) promoting the reduction of the G...

2007
B. Peng H. D. Espinosa

An analysis of size effects and doping on the strength of ultrananocrystalline diamond (UNCD) thin films is presented. The doping was achieved by the addition of nitrogen gas to the Ar/CH4 microwave plasma. The strength data, obtained by means of the membrane deflection experiment (MDE) were interpreted using Weibull statistics. The validity and predictive capability of the theory were examined...

2013
Eunsu Paek Alexander J. Pak Kyoung E. Kweon Gyeong S. Hwang

Graphene-based electrodes have been widely tested and used in electrochemical double layer capacitors due to their high surface area and electrical conductivity. Nitrogen doping of graphene has recently been demonstrated to significantly enhance capacitance, but the underlying mechanisms remain ambiguous. We present the doping effect on the interfacial capacitance between graphene and [BMIM][PF...

2014
Ye Wei Haifei Zhan Kang Xia Wendong Zhang Shengbo Sang Yuantong Gu

Based on its enticing properties, graphene has been envisioned with applications in the area of electronics, photonics, sensors, bio-applications and others. To facilitate various applications, doping has been frequently used to manipulate the properties of graphene. Despite a number of studies conducted on doped graphene regarding its electrical and chemical properties, the impact of doping on...

Journal: :ACS nano 2015
Markus Rein Nils Richter Khaled Parvez Xinliang Feng Hermann Sachdev Mathias Kläui Klaus Müllen

We identify the influence of nitrogen-doping on charge- and magnetotransport of single layer graphene by comparing doped and undoped samples. Both sample types are grown by chemical vapor deposition (CVD) and transferred in an identical process onto Si/SiO2 wafers. We characterize the samples by Raman spectroscopy as well as by variable temperature magnetotransport measurements. Over the entire...

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