Utilization of both-side metal decoration in close-packed SnO 2 nanodome arrays for ultrasensitive gas sensing

Title
Utilization of both-side metal decoration in close-packed SnO 2 nanodome arrays for ultrasensitive gas sensing
Authors
심영석김도홍정후영김연후남승훈강종윤김진상이우영장호원
Keywords
Nanodome arrays; Metal decoration; Soft-templating; templatingGas sensor; Ultrasensitive
Issue Date
2015-07
Publisher
Sensors and actuators. B, Chemical
Citation
VOL 213, 314-321
Abstract
tMetal decoration on hollow metal oxide nanostructures is an attractive route to enhance gas sensingproperties. Herein, we present a facile method for the utilization of metal decoration on both the inner andouter surfaces of hollow metal oxide nanostructure for the first time. Close-packed SnO2nanodome arraysdecorated with Au nanoparticles are fabricated by soft-template method and self-agglomeration of an Aufilm. The position of Au decoration for SnO2nanodome arrays is controlled by changing the depositionsequence of Au and SnO2films. While inside, outside, and both-side Au-decorated SnO2nanodome arraysshow much higher responses to various gases than a bare SnO2nanodome, it is shown that the responseof both-side Au-decorated SnO2nanodome arrays to C2H5OH at 300◦C is 18 times higher than that ofthe bare SnO2nanodome arrays and the theoretical detection limit is below 1 ppb. These are attributedto the catalytic effect of Au nanoparticles on the modulation of barrier potentials in links between theindividual SnO2nanodomes. Our results demonstrate that the utilization of both-side metal decorationis an effective strategy for enhancing the gas sensing performance of hollow metal oxide nanostructures.
URI
http://pubs.kist.re.kr/handle/201004/50404
ISSN
09254005
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KIST Publication > Article
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