Nano Archive

Fabrication of ZnO nanorod-based hydrogen gas nanosensor

Lupan, Oleg and Chai, Guangyu and Chow, Lee (2007) Fabrication of ZnO nanorod-based hydrogen gas nanosensor. MICROELECTRONICS JOURNAL, 38 (12). pp. 1211-1216.

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We report a first work on nanofabrication of hydrogen nanosensor from single ZnO branched nanorods (tripod) using in-situ lift-out technique and performed in the chamber of focused ion beam (FIB) system. Self-assembled ZnO branched nanorod has been grown by a cost-effective and fast synthesis route using an aqueous solution method and rapid thermal processing. Their properties were analyzed by X-ray diffraction, scanning electron microscopy, energy dispersion X-ray spectroscopy, transmission electron microscopy, and micro-Raman spectroscopy. These analyses indicate high quality ZnO nanorods. Furthermore, our synthesis technique permits branched nanorods to be easily transferred to other substrates. This flexibility of substrate choice opens the possibility of using FIB system for handling. The main advantage of the proposed in-situ approach is a controllable lift-out procedure which permitted us to obtain a 90% success rate for building nanodevices. The fabricated nanosensor uses only single self-assembled ZnO branched nanorod (tripod) to gauge the 150 ppm H-2 in the air at room temperature. The hydrogen sensitivity is in the range of 0.6-2% depending on which two branches to use. The nanosensor has selectivity against other gases such as O-2, CH4, CO and LPG, which shows sensitivity of < 0.02%. The single ZnO branched nanorod sensor can operate at low power of < 5 mu W. (C) 2007 Elsevier Ltd. All rights reserved.

Item Type:Article
Uncontrolled Keywords:nanoscale materials and structures; nanofabrication; gas sensor; hydrogen; ZnO branched nanorod
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Nanofabrication processes and tools
Physical Science > Nano objects
Analytical Science > Nanotechnology for sensing and actuating
ID Code:2320
Deposited By:Anuj Seth
Deposited On:18 Dec 2008 13:55
Last Modified:20 Jan 2009 10:40

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