NO2 gas sensing properties of amorphous InGaZnO4 submicron-tubes prepared by polymeric fiber templating route

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One-dimensional (1D) amorphous InGaZnO4 (a-IGZO) submicron-tubes were synthesized in a method involving an electrospun polymeric fiber template and the direct RF-sputter-coating of a-IGZO films combined with subsequent calcination at 450 degrees C. The a-IGZO hollow fibers with a diameter of 300 nm and a shell thickness of 20-30 nm showed an amorphous structure, as confirmed by XRD and HR-TEM analyses. Gas sensors using semiconducting a-IGZO tube networks exhibited n-type gas sensing characteristics and a 3.7-fold higher gas response (R-gas/R-air = 109.5 at 2 ppm NO2) compared to (R-gas/R-air = 29.4) planar a-IGZO thin films at an operating temperature of 300 degrees C. The enhanced gas response of a-IGZO tubes is attributed to the greater space charge modulation depth associated with the thin shell structures and the porous networks which are readily accessible by gas. (C) 2011 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2011-12
Language
English
Article Type
Article
Keywords

SENSORS; NANOFIBERS; OXIDE; MICROSTRUCTURE

Citation

SENSORS AND ACTUATORS B-CHEMICAL, v.160, no.1, pp.499 - 504

ISSN
0925-4005
URI
http://hdl.handle.net/10203/100817
Appears in Collection
MS-Journal Papers(저널논문)
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