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http://dx.doi.org/10.5012/bkcs.2013.34.6.1632

UV Enhanced NO2 Sensing Properties of Pt Functionalized Ga2O3 Nanorods  

An, Soyeon (Department of Materials Science and Engineering, Inha University)
Park, Sunghoon (Department of Materials Science and Engineering, Inha University)
Mun, Youngho (Department of Materials Science and Engineering, Inha University)
Lee, Chongmu (Department of Materials Science and Engineering, Inha University)
Publication Information
Bulletin of the Korean Chemical Society / v.34, no.6, 2013 , pp. 1632-1636 More about this Journal
Abstract
$Ga_2O_3$ one-dimensional (1D) nanostructures were synthesized by using a thermal evaporation technique. The morphology, crystal structure, and sensing properties of the $Ga_2O_3$ nanostructures functionalized with Pt to $NO_2$ gas at room temperature under UV irradiation were examined. The diameters of the 1D nanostructures ranged from a few tens to a few hundreds of nanometers and the lengths ranged up to a few hundreds of micrometers. Pt nanoparticles with diameters of a few tens of nanometers were distributed around a $Ga_2O_3$ nanorod. The responses of the nanorods gas sensors fabricated from multiple networked $Ga_2O_3$ nanorods were improved 3-4 fold at $NO_2$ concentrations ranging from 1 to 5 ppm by Pt functionalization. The Pt-functionalized $Ga_2O_3$ nanorod gas sensors showed a remarkably enhanced response at room temperature under ultraviolet (UV) light illumination. In addition, the mechanisms via which the gas sensing properties of $Ga_2O_3$ nanorods are enhanced by Pt functionalization and UV irradiation are discussed.
Keywords
$Ga_2O_3$; Nanorod; Gas sensor; UV; Functionalization;
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