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    題名: High-Temperature Annealing Effects on Multiwalled Carbon Nanotubes: Electronic Structure, Field Emission and Magnetic Behaviors
    作者: 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
    貢獻者: 淡江大學物理學系
    關鍵詞: MWCNTs;Thermal annealing;Electronic Structure;Electron field Emission;Magnetization
    日期: 2009-12
    上傳時間: 2012-06-14 09:24:36 (UTC+8)
    出版者: Valencia: American Scientific Publishers
    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.
    關聯: Journal of Nanoscience and Nanotechnology 9(12), pp.6799-6805
    DOI: 10.1166/jnn.2009.1581
    顯示於類別:[物理學系暨研究所] 期刊論文

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