Room temperature ammonia sensing properties of W18O49 nanowires
2009; Elsevier BV; Volume: 137; Issue: 1 Linguagem: Inglês
10.1016/j.snb.2009.01.004
ISSN1873-3077
Autores Tópico(s)Analytical Chemistry and Sensors
ResumoThis paper describes the room temperature ammonia sensing properties of ultra-thin W18O49 nanowire (diameter less than 5 nm) 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.
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