Near Frictionless Behavior of Hydrogen Plasma Treated Diamond Nanowire Films
學年 101
學期 2
出版（發表）日期 2013-06-01
作品名稱 Near Frictionless Behavior of Hydrogen Plasma Treated Diamond Nanowire Films
作品名稱（其他語言）
著者 Jothiramalingam Sankaran, Kamatchi; Kumar, Niranjan; Chen, Huang-Chin; Dong, Chung-Li; Bahuguna, Ashok; Dash, Sitaram; Kumar Tyagi, Ashok; Lee, Chi-Young; Tai, Nyan-Hwa; Lin, I-Nan
單位 淡江大學物理學系
出版者 Valencia: American Scientific Publishers
著錄名稱、卷期、頁數 Science of Advanced Materials 5(6), pp.687-698
摘要 The diamond nanowires (DNW) films have been deposited by N2-based microwave plasma enhanced chemical vapor deposition. Hydrogen plasma treatment is carried out on these films for various treatment times which result in microstructural and chemical modification. Morphology of as-grown DNW films resemble symmetry of dense grains composed in nanowires; however the wires break into ultrasmall, randomly distributed spherical shaped grains after 15 minutes of H2 plasma treatment. Transmission electron microscopy depicts that as-grown DNW films mainly consist of diamond nanocrystals with graphitic sp2C—C bonded grain boundaries. However, the graphitic grain boundaries do not exist after H2 plasma treatment on DNW films. Raman spectroscopy and near edge X-ray absorption fine structure spectroscopy studies reveal that after H2 plasma treatment the films possess large fraction of sp3 C—C and C—H bonding in the form of trans-polyacetylene symmetry of sp2 CH x . Interestingly, the friction coefficient of 0.0001 is obtained for the 15 minutes H2 plasma treated DNW films. Such an extent of low valued friction coefficient is described by the passivation of uncompensated carbon dangling bonds by hydrogen content and adsorption of H2 O molecules. Furthermore, in low humid atmosphere, the friction coefficient is found to be consistently increased which confirms the insufficient chemical passivation of carbon dangling bonds.
關鍵字 diamond nanowire films; high resolution transmission electron microscopy; hydrogen plasma treatment; nanocrystalline graphite; near frictionless behaviour; trans-polyacetylene
語言 en
ISSN 1947-2935
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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