Title of Paper:CuO-In2O3 Core-Shell Nanowire Based Chemical Gas Sensors

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Date of Publication:2014-01-01

Journal:JOURNAL OF NANOMATERIALS

Included Journals:SCIE、EI

Volume:2014

ISSN No.:1687-4110

Abstract:The CuO-In2O3 core-shell nanowire was fabricated by a two-step method. The CuO nanowire core (NWs) was firstly grown by the conventional thermal oxidation of Cu meshes at 500 degrees C for 5 hours. Then, the CuO nanowires were immersed into the suspension of amorphous indium hydroxide deposited from the In(AC)(3) solution by ammonia. The CuO nanowires coated with In(OH)(3) were subsequently heated at 600 degrees C to form the crystalline CuO-In2O3 core-shell structure, with In2O3 nanocrystals uniformly anchored on the CuO nanowires. The gas sensing properties of the formed CuO-In2O3 core-shell nanowires were investigated by various reducing gases such as hydrogen, carbon monoxide, and propane at elevated temperature. The sensors using the CuO-In2O3 nanowires show improved sensing performance to hydrogen and propane but a suppressed response to carbon monoxide, which could be attributed to the enhanced catalytic properties of CuO with the coated porous In2O3 shell and the p-n junction formed at the core-shell interface.