Nano Archive

Individual Bi2S3 nanowire-based room-temperature H-2 sensor

Yao, Kun and Gong, W. W. and Hu, Y. F. and Liang, Xuelei and Chen, Qing and Peng, Lian-Mao (2008) Individual Bi2S3 nanowire-based room-temperature H-2 sensor. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (23). pp. 8721-8724.

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Single Bi2S3 nanowire devices were fabricated using the focused ion beam technique to deposit Pt electrodes. Repeatable and reliable ohmic contacts were obtained. The devices exhibit outstanding H-2 sensing performance that can detect H2 (in N-2) at room temperature with a sensitivity of 22% at 10 ppm (corresponds to 4.0 x 10(-7) mol/L). Decorating Pd nanoparticles on the surface of the nanowire does not improve the sensing performance, contrary to most of the existing nanowire (or nanotube) H-2 sensors. The sensing mechanism of Bi2S3 nanowire devices is found to be different from that of other sensors based on nanowires or nanotubes. Experiments on different H-2 concentrations and gas pressures suggest that the sensing response is determined mainly by the amount of H-2 molecules instead of the proportion of H-2 in the mixed gas.

Item Type:Article
Subjects:Physical Science > Nano objects
Analytical Science > Nanotechnology for sensing and actuating
Material Science > Nanochemistry
ID Code:1232
Deposited By:Anuj Seth
Deposited On:16 Dec 2008 10:15
Last Modified:19 Feb 2009 09:44

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