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.
| Original language | English |
|---|---|
| Pages (from-to) | 314-321 |
| Number of pages | 8 |
| Journal | Sensors and Actuators, B: Chemical |
| Volume | 213 |
| DOIs | |
| Publication status | Published - 2015 Jul 5 |
| Externally published | Yes |
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Keywords
- Gas sensor
- Metal decoration
- Nanodome arrays
- Soft-templating
- Ultrasensitive
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
- Metals and Alloys
- Surfaces, Coatings and Films
- Materials Chemistry
- Instrumentation
Cite this
Utilization of both-side metal decoration in close-packed SnO2 nanodome arrays for ultrasensitive gas sensing. / Shim, Young Seok; Kim, Do Hong; Jeong, Hu Young; Kim, Yeon Hoo; Nahm, Seung Hoon; Kang, Chong-Yun; Kim, Jin Sang; Lee, Wooyoung; Jang, Ho Won.
In: Sensors and Actuators, B: Chemical, Vol. 213, 05.07.2015, p. 314-321.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Utilization of both-side metal decoration in close-packed SnO2 nanodome arrays for ultrasensitive gas sensing
AU - Shim, Young Seok
AU - Kim, Do Hong
AU - Jeong, Hu Young
AU - Kim, Yeon Hoo
AU - Nahm, Seung Hoon
AU - Kang, Chong-Yun
AU - Kim, Jin Sang
AU - Lee, Wooyoung
AU - Jang, Ho Won
PY - 2015/7/5
Y1 - 2015/7/5
N2 - 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.
AB - 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.
KW - Gas sensor
KW - Metal decoration
KW - Nanodome arrays
KW - Soft-templating
KW - Ultrasensitive
UR - http://www.scopus.com/inward/record.url?scp=84924778235&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84924778235&partnerID=8YFLogxK
U2 - 10.1016/j.snb.2015.02.103
DO - 10.1016/j.snb.2015.02.103
M3 - Article
AN - SCOPUS:84924778235
VL - 213
SP - 314
EP - 321
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
ER -