High-Temperature Annealing Effects on Multiwalled Carbon Nanotubes: Electronic Structure, Field Emission and Magnetic Behaviors
學年 98
學期 1
出版（發表）日期 2009-12-01
作品名稱 High-Temperature Annealing Effects on Multiwalled Carbon Nanotubes: Electronic Structure, Field Emission and Magnetic Behaviors
作品名稱（其他語言）
著者 Ray, Sekhar Chandra; Pao, Chih-Wen; Tsai, Huang-Ming; Chen, Huang-Chin; Chen, Yu-Shin; Wu, Shang-Lun; Ling, Dah-Chin; Lin, I-Nan; Pong, Way-Faung; Gupta, Sanju; Giorcelli, Mauro; Bianco, Stefano; Musso, Simone; Tagliaferro, Alberto
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 Journal of Nanoscience and Nanotechnology 9(12), pp.6799-6805
摘要 This work elucidates the effects of high-temperature annealing on the microscopic and electronic structure of multiwalled carbon nanotubes (MWCNTs) using high-resolution transmission electron microscopy, micro-Raman spectroscopy, X-ray diffraction, X-ray absorption near-edge structure (XANES) and valence-band photoemission spectroscopy (VBPES), respectively. The field emission and magnetization behaviors are also presented. The results of annealing are as follows: (1) MWCNTs tend to align in the form of small fringes along their length, promote graphitization and be stable in air, (2) XANES indicates an enhancement in oxygen content on the sample, implying that it can be adopted for sensing and storing oxygen gas, (3) the electron field emission current density (J) is enhanced and the turn-on electric field (ETOE) reduced, suggesting potential use in field emission displays and as electron sources in microwave tube amplifiers and (4) as-grown MWCNTs with embedded iron nanoparticles exhibits significantly higher coercivity ∼750 Oe than its bulk counterpart (Febulk ≈ 0.9 Oe), suggesting its potential use as low-dimensional high-density magnetic recording media.
關鍵字 MWCNTs; Thermal annealing; Electronic Structure; Electron field Emission; Magnetization
語言 en
ISSN 1533-4899
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Ray, Sekhar Chandra
審稿制度 是
國別 USA
公開徵稿
出版型式 電子版
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