期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 137, 期 1, 页码 27-31出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.01.004
关键词
Gas sensor; Tungsten oxide nanowire; Ammonia
This paper describes the room temperature ammonia sensing properties of ultra-thin W18O49 nanowire (diameter less than 5nm) bundles prepared by a solvothermal technique. The W18O49 nanowires of high Surface areas exhibit a concentration-dependent response when exposed to ammonia. An abnormal behavior of resistance increases first and followed by a decrease was observed when ammonia concentration is above 1 ppm. The response of W18O49 nanowires to ammonia transited from n-type to p-type when the concentration decreased to sub-ppm level. The W18O49 nanowires are highly sensitive to sub-ppm and ppb level ammonia at room temperature, which is attributed to the small diameters, high surface areas and non-stoichiometric crystal Structure. (C) 2009 Elsevier B.V. All rights reserved.
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