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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM
  • Insitu-TEM characterization of carbon-based materials using nanofactory STM holder for Li-ion battery application
  • Structural characterization of mesoporous materials using SEM & TEM
  • Interface analysis between various oxides and metals through Cs-corrected (S)TEM
  • Resistive switching mechanism of graphene oxide thin films for RRAM application

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Utilization of both-side metal decoration in close-packed SnO2 nanodome arrays for ultrasensitive gas sensing

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Title
Utilization of both-side metal decoration in close-packed SnO2 nanodome arrays for ultrasensitive gas sensing
Author
Shim, Young-SeokKim, Do HongJeong, Hu YoungKim, Yeon HooNahm, Seung HoonKang, Chong YunKim, Jin-SangLee, WoowoungJang, Ho Won
Issue Date
2015-07
Publisher
ELSEVIER SCIENCE SA
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.213, pp.314 - 321
Abstract
Metal decoration on hollow metal oxide nanostructures is an attractive route to enhance gas sensing properties. Herein, we present a facile method for the utilization of metal decoration on both the inner and outer surfaces of hollow metal oxide nanostructure for the first time. Close-packed SnO2 nanodome arrays decorated with Au nanoparticles are fabricated by soft-template method and self-agglomeration of an Au film. The position of Au decoration for SnO2 nanodome arrays is controlled by changing the deposition sequence of Au and SnO2 films. While inside, outside, and both-side Au-decorated SnO2 nanodome arrays show much higher responses to various gases than a bare SnO2 nanodome, it is shown that the response of both-side Au-decorated SnO2 nanodome arrays to C2H5OH at 300 °C is 18 times higher than that of the bare SnO2 nanodome arrays and the theoretical detection limit is below 1 ppb. These are attributed to the catalytic effect of Au nanoparticles on the modulation of barrier potentials in links between the individual SnO2 nanodomes. Our results demonstrate that the utilization of both-side metal decoration is an effective strategy for enhancing the gas sensing performance of hollow metal oxide nanostructures. © 2015 Elsevier B.V.. All rights reserved
URI
https://scholarworks.unist.ac.kr/handle/201301/11133
URL
http://www.sciencedirect.com/science/article/pii/S0925400515002889
DOI
10.1016/j.snb.2015.02.103
ISSN
0925-4005
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