Extremely sensitive ethanol sensor using Pt-doped SnO2 hollow nanospheres prepared by Kirkendall diffusion

Bo Young Kim; Jung Sang Cho; Ji Wook Yoon; Chan Woong Na; Chul Soon Lee; Jee Hyun Ahn; Yun Chan Kang; Jong Heun Lee

doi:10.1016/j.snb.2016.05.002

Extremely sensitive ethanol sensor using Pt-doped SnO₂ hollow nanospheres prepared by Kirkendall diffusion

Bo Young Kim, Jung Sang Cho, Ji Wook Yoon, Chan Woong Na, Chul Soon Lee, Jee Hyun Ahn, Yun Chan Kang, Jong Heun Lee

Research output: Contribution to journal › Article

56 Citations (Scopus)

Abstract

The pure and 0.3 wt% Pt-doped SnO₂ hollow nanospheres were prepared by the oxidation of pure and Pt-doped Sn nanoscrystals embedded in carbon matrix and their gas sensing characteristics were investigated. The formation of hollow morphology was attributed to the nanoscale Kirkendall effect due to rapid outward diffusion of Sn ions and relatively slow inward diffusion of oxygen. Pure SnO₂ hollow nanospheres showed a high response (resistance ratio) of 93.3 when exposed to 5 ppm ethanol. The response to 5 ppm ethanol was significantly increased to 1399.9 with doping 0.3 wt% Pt. In addition, selectivity to ethanol was also enhanced by Pt doping. Ultrasensitive and selective detection of ethanol in pure and Pt-doped SnO₂ nanospheres is explained by the effective electron depletion in hollow structures and catalytic promotion of gas sensing reaction.

Original language	English
Pages (from-to)	353-360
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	234
DOIs	https://doi.org/10.1016/j.snb.2016.05.002
Publication status	Published - 2016 Oct 29

Keywords

Gas sensor
Hollow spheres
Kirkendall diffusion
Sensitivity
SnO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry
Electrical and Electronic Engineering

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Kim, B. Y., Cho, J. S., Yoon, J. W., Na, C. W., Lee, C. S., Ahn, J. H., Kang, Y. C., & Lee, J. H. (2016). Extremely sensitive ethanol sensor using Pt-doped SnO₂ hollow nanospheres prepared by Kirkendall diffusion. Sensors and Actuators, B: Chemical, 234, 353-360. https://doi.org/10.1016/j.snb.2016.05.002

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abstract = "The pure and 0.3 wt% Pt-doped SnO2 hollow nanospheres were prepared by the oxidation of pure and Pt-doped Sn nanoscrystals embedded in carbon matrix and their gas sensing characteristics were investigated. The formation of hollow morphology was attributed to the nanoscale Kirkendall effect due to rapid outward diffusion of Sn ions and relatively slow inward diffusion of oxygen. Pure SnO2 hollow nanospheres showed a high response (resistance ratio) of 93.3 when exposed to 5 ppm ethanol. The response to 5 ppm ethanol was significantly increased to 1399.9 with doping 0.3 wt% Pt. In addition, selectivity to ethanol was also enhanced by Pt doping. Ultrasensitive and selective detection of ethanol in pure and Pt-doped SnO2 nanospheres is explained by the effective electron depletion in hollow structures and catalytic promotion of gas sensing reaction.",

keywords = "Gas sensor, Hollow spheres, Kirkendall diffusion, Sensitivity, SnO",

author = "Kim, {Bo Young} and Cho, {Jung Sang} and Yoon, {Ji Wook} and Na, {Chan Woong} and Lee, {Chul Soon} and Ahn, {Jee Hyun} and Kang, {Yun Chan} and Lee, {Jong Heun}",

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AU - Kim, Bo Young

AU - Cho, Jung Sang

AU - Yoon, Ji Wook

AU - Na, Chan Woong

AU - Lee, Chul Soon

AU - Ahn, Jee Hyun

AU - Kang, Yun Chan

AU - Lee, Jong Heun

PY - 2016/10/29

Y1 - 2016/10/29

N2 - The pure and 0.3 wt% Pt-doped SnO2 hollow nanospheres were prepared by the oxidation of pure and Pt-doped Sn nanoscrystals embedded in carbon matrix and their gas sensing characteristics were investigated. The formation of hollow morphology was attributed to the nanoscale Kirkendall effect due to rapid outward diffusion of Sn ions and relatively slow inward diffusion of oxygen. Pure SnO2 hollow nanospheres showed a high response (resistance ratio) of 93.3 when exposed to 5 ppm ethanol. The response to 5 ppm ethanol was significantly increased to 1399.9 with doping 0.3 wt% Pt. In addition, selectivity to ethanol was also enhanced by Pt doping. Ultrasensitive and selective detection of ethanol in pure and Pt-doped SnO2 nanospheres is explained by the effective electron depletion in hollow structures and catalytic promotion of gas sensing reaction.

AB - The pure and 0.3 wt% Pt-doped SnO2 hollow nanospheres were prepared by the oxidation of pure and Pt-doped Sn nanoscrystals embedded in carbon matrix and their gas sensing characteristics were investigated. The formation of hollow morphology was attributed to the nanoscale Kirkendall effect due to rapid outward diffusion of Sn ions and relatively slow inward diffusion of oxygen. Pure SnO2 hollow nanospheres showed a high response (resistance ratio) of 93.3 when exposed to 5 ppm ethanol. The response to 5 ppm ethanol was significantly increased to 1399.9 with doping 0.3 wt% Pt. In addition, selectivity to ethanol was also enhanced by Pt doping. Ultrasensitive and selective detection of ethanol in pure and Pt-doped SnO2 nanospheres is explained by the effective electron depletion in hollow structures and catalytic promotion of gas sensing reaction.

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KW - Kirkendall diffusion

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