High-Temperature Annealing Effects on Multiwalled Carbon Nanotubes: Electronic Structure, Field Emission and Magnetic Behaviors

doi:10.1166/jnn.2009.1581

機構典藏 > College of Sciences > Graduate Institute & Department of Physics > Journal Article > Item 987654321/77255

Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/77255

Title:	High-Temperature Annealing Effects on Multiwalled Carbon Nanotubes: Electronic Structure, Field Emission and Magnetic Behaviors
Authors:	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
Contributors:	淡江大學物理學系
Keywords:	MWCNTs;Thermal annealing;Electronic Structure;Electron field Emission;Magnetization
Date:	2009-12
Issue Date:	2012-06-14 09:24:36 (UTC+8)
Publisher:	Valencia: American Scientific Publishers
Abstract:	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.
Relation:	Journal of Nanoscience and Nanotechnology 9(12), pp.6799-6805
DOI:	10.1166/jnn.2009.1581
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

Files in This Item:

File	Description	Size	Format
1533-4899_9(12)p6799-6805.pdf		8934Kb	Adobe PDF	383	View/Open

Loading...