Direct Observation and Mechanism for Enhanced Electron Emission in Hydrogen Plasma-Treated Diamond Nanowire Films
學年 102
學期 2
出版（發表）日期 2014-06-01
作品名稱 Direct Observation and Mechanism for Enhanced Electron Emission in Hydrogen Plasma-Treated Diamond Nanowire Films
作品名稱（其他語言）
著者 Kalpataru Panda; Kamatchi Jothiramalingam Sankaran; Binaya Kumar Panigrahi; Tai, Nyan-Hwa; Lin, I-Nan; 林諭男
單位 淡江大學物理學系
出版者 Washington, DC: American Chemical Society
著錄名稱、卷期、頁數 ACS Applied Materials & Interfaces 6(11), pp.8531−8541
摘要 The effect of hydrogen plasma treatment on the electrical conductivity and electron field emission (EFE) properties for diamond nanowire (DNW) films were systematically investigated. The DNW films were deposited on silicon substrate by N2-based microwave plasma-enhanced chemical vapor deposition process. Transmission electron microscopy depicted that DNW films mainly consist of wirelike diamond nanocrystals encased in a nanographitic sheath, which formed conduction channels for efficient electron transport and hence lead to excellent electrical conductivity and EFE properties for these films. Hydrogen plasma treatment initially enhanced the electrical conductivity and EFE properties of DNW films and then degraded with an increase in treatment time. Scanning tunneling spectroscopy in current imaging tunneling spectroscopy mode clearly shows significant increase in local emission sites in 10 min hydrogen plasma treated diamond nanowire (DNW10) films as compared to the pristine films that is ascribed to the formation of graphitic phase around the DNWs due to the hydrogen plasma treatment process. The degradation in EFE properties of extended (15 min) hydrogen plasma-treated DNW films was explained by the removal of nanographitic phase surrounding the DNWs. The EFE process of DNW10 films can be turned on at a low field of 4.2 V/μm and achieved a high EFE current density of 5.1 mA/cm2 at an applied field of 8.5 V/μm. Moreover, DNW10 films with high electrical conductivity of 216 (Ω cm)−1 overwhelm that of other kinds of UNCD films and will create a remarkable impact to diamond-based electronics.
關鍵字 diamond nanowire films; hydrogen plasma treatment; nanographite; electron field emission; scanning tunneling spectroscopy; high resolution transmission electron microscopy
語言
ISSN 1944-8244
期刊性質 國外
收錄於
產學合作
通訊作者
審稿制度
國別 USA
公開徵稿
出版型式 紙本
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