標題: Structural and Electrical Properties of Conducting Diamond Nanowires
作者: Sankaran, Kamatchi Jothiramalingam
Lin, Yen-Fu
Jian, Wen-Bin
Chen, Huang-Chin
Panda, Kalpataru
Sundaravel, Balakrishnan
Dong, Chung-Li
Tai, Nyan-Hwa
Lin, I-Nan
電子物理學系
Department of Electrophysics
關鍵字: diamond nanowire films;graphitic grain boundary;high resolution transmission electron microscopy;scanning tunneling spectroscopy;hopping transport;electron field emission
公開日期: 27-二月-2013
摘要: Conducting diamond nanowires (DNWs) films have been synthesized by N-2-based microwave plasma enhanced chemical vapor deposition. The incorporation of nitrogen into DNWs films is examined by C Is X-ray photoemission spectroscopy and morphology of DNWs is discerned using field-emission scanning electron microscopy and transmission electron microscopy (TEM). The electron diffraction pattern, the visible-Raman spectroscopy, and the near-edge X-ray absorption fine structure spectroscopy display the coexistence of sp(3) diamond and sp(2) graphitic phases in DNWs films. In addition, the microstructure investigation, carried out by high-resolution TEM with Fourier transformed pattern, indicates diamond grains and graphitic grain boundaries on surface of DNWs. The same result is confirmed by scanning tunneling microscopy and scanning tunneling spectroscopy (STS). Furthermore, the STS spectra of current-voltage curves discover a high tunneling current at the position near the graphitic grain boundaries. These highly conducting regimes of grain boundaries form effective electron paths and its transport mechanism is explained by the three-dimensional (3D) Mott's variable range hopping in a wide temperature from 300 to 20 K. Interestingly, this specific feature of high conducting grain boundaries of DNWs demonstrates a high efficiency in field emission and pave a way to the next generation of high-definition flat panel displays or plasma devices.
URI: http://dx.doi.org/10.1021/am302430p
http://hdl.handle.net/11536/21201
ISSN: 1944-8244
DOI: 10.1021/am302430p
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 5
Issue: 4
起始頁: 1294
結束頁: 1301
顯示於類別:期刊論文


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  1. 000315619100017.pdf