Fabrication of tin dioxide nanowires with ultrahigh gas sensitivity by atomic layer deposition of platinum

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Title:	Fabrication of tin dioxide nanowires with ultrahigh gas sensitivity by atomic layer deposition of platinum
Authors:	Lin, YH (Lin, Yu-Hung) Hsueh, YC (Hsueh, Yang-Chih) Lee, PS (Lee, Po-Sheng) Wang, CC (Wang, Chih-Chieh) Wu, JM (Wu, Jyh Ming) Perng, TP (Perng, Tsong-Pyng) Shih, HC (Shih, Han C.)
Contributors:	Inst Mat Sci & Nanotechnol
Keywords:	DOPED SNO2 NANOWIRES PHOTON-SENSING PROPERTIES ROOM-TEMPERATURE THIN-FILMS SENSORS OXIDE SURFACE NANOPARTICLES TIO2 H2S
Date:	2011
Issue Date:	2013-02-18 13:56:12 (UTC+8)
Abstract:	Gas-sensing properties of SnO(2) nanowires were investigated before and after their surface functionalization by the atomic layer deposition (ALD) of Pt nanoparticles. The morphology, size, and concentration of Pt particles on SnO(2) nanowires can be controlled by varying the number of ALD reaction cycles, and therefore, the gas-sensing properties of the nanowires can be altered via the Pt catalyst effect and the modification of Schottky barrier junctions on the nanowire surface in the vicinity of Pt nanoparticles. The Pt-decorated SnO(2) nanowires obtained after 200 ALD reaction cycles exhibited an ultrahigh gas sensitivity (S = I(g)/I(a)) of similar to 8400 to 500 ppm ethanol vapor at 200 degrees C. This provides an efficient route for strongly enhancing the gas sensitivity of semiconducting nanostructures and fabricating gas sensors that are highly sensitive and responsive.
Relation:	JOURNAL OF MATERIALS CHEMISTRY 卷: 21 期: 28 頁數: 10552-10558
Appears in Collections:	[Department of Chemical & Materials Engineering] journal articles

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