Synthesis of IrO2 nanocrystals on carbon nanotube bundle arrays and their field emission characteristics

被引:21
作者
Chen, Y. M. [1 ]
Chen, C. A. [1 ]
Huang, Y. S. [1 ]
Lee, K. Y. [1 ,2 ]
Tiong, K. K. [3 ]
机构
[1] Natl Taiwan Univ Sci & Technol, Dept Elect Engn, Taipei 106, Taiwan
[2] Natl Taiwan Univ Sci & Technol, Grad Inst Electroopt Engn, Taipei 106, Taiwan
[3] Natl Taiwan Ocean Univ, Dept Elect Engn, Chilung 202, Taiwan
关键词
Nanostructured materials; Oxide materials; Metal-organic chemical vapor deposition; Field emission effect; Scanning electron microscopy; Transmission electron microscopy; RAMAN-SCATTERING CHARACTERIZATION; ALIGNED RUO2; MORPHOLOGY; GROWTH;
D O I
10.1016/j.jallcom.2009.07.181
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
IrO2 nanocrystals (NCs) were deposited on patterned carbon nanotube (CNT) bundle arrays via metal-organic chemical vapor deposition (MOCVD) using (C6H7)(C8H12)Ir as a source reagent. The structural and spectroscopic properties of the IrO2/CNTs composite were characterized by field-emission scanning electron microscopy, Raman spectroscopy and transmission electron microscopy. The combined effects of the geometrical structure of IrO2/CNTs, and the natural conducting and enhanced resistance to oxidation properties of IrO2 lead to a low turn-on field of 0.9 V/mu m at a current density of 0.1 mu A/cm(2), a low threshold field of 2.7 V/mu m at a current density of 1 mA/cm(2), a high field enhancement factor of 7.4 x 10(3), and long-term stability for the IrO2/CNTs composite. The results indicate that the IrO2/CNTs composite can be a potential candidate for field emission devices. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:659 / 664
页数:6
相关论文
共 26 条
[1]   Work functions and surface functional groups of multiwall carbon nanotubes [J].
Ago, H ;
Kugler, T ;
Cacialli, F ;
Salaneck, WR ;
Shaffer, MSP ;
Windle, AH ;
Friend, RH .
JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (38) :8116-8121
[2]   HIGH-RESOLUTION ELECTRON-MICROSCOPY AND INELASTIC LIGHT-SCATTERING OF PURIFIED MULTISHELLED CARBON NANOTUBES [J].
BACSA, WS ;
UGARTE, D ;
CHATELAIN, A ;
DEHEER, WA .
PHYSICAL REVIEW B, 1994, 50 (20) :15473-15476
[3]   Carbon nanotubes - the route toward applications [J].
Baughman, RH ;
Zakhidov, AA ;
de Heer, WA .
SCIENCE, 2002, 297 (5582) :787-792
[4]  
Chai Y, 2005, CHINESE PHYS LETT, V22, P911, DOI 10.1088/0256-307X/22/4/037
[5]   Stable field emission property of patterned MgO coated carbon nanotube arrays [J].
Chakrabarti, Supriya ;
Pan, Lujun ;
Tanaka, Hiroyoshi ;
Hokushin, Shogo ;
Nakayama, Yoshikazu .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 2007, 46 (7A) :4364-4369
[6]   Fabrication of iridium field emitter arrays [J].
Chalamala, BR ;
Wei, Y ;
Rossi, G ;
Smith, BG ;
Reuss, RH .
APPLIED PHYSICS LETTERS, 2000, 77 (20) :3284-3286
[7]   Effect of growth conditions on surface morphology and photoelectric work function characteristics of iridium oxide thin films [J].
Chalamala, BR ;
Wei, Y ;
Reuss, RH ;
Aggarwal, S ;
Gnade, BE ;
Ramesh, R ;
Bernhard, JM ;
Sosa, ED ;
Golden, DE .
APPLIED PHYSICS LETTERS, 1999, 74 (10) :1394-1396
[8]   Field emission from vertically aligned conductive IrO2 nanorods [J].
Chen, RS ;
Huang, YS ;
Liang, YM ;
Hsieh, CS ;
Tsai, DS ;
Tiong, KK .
APPLIED PHYSICS LETTERS, 2004, 84 (09) :1552-1554
[9]   Electron field emission from carbon nanotubes [J].
Cheng, Y ;
Zhou, O .
COMPTES RENDUS PHYSIQUE, 2003, 4 (09) :1021-1033
[10]   Carbon nanotubes [J].
Ebbesen, TW .
PHYSICS TODAY, 1996, 49 (06) :26-32