Optimization of the Pt Nanoparticle Size and Calcination Temperature for Enhanced Sensing Performance of Pt-Decorated In2O3 Nanorods

The surface-to-volume ratio of one-dimensional (1D) semiconductor metal-oxide sensors is an important factor for achieving good gas sensing properties because it offers a wide response area. To exploit this effect, in this study, we determined the optimal calcination temperature to maximize the spec...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2018, 73(10), , pp.1444-1451
Main Authors: Choi, Seung-Bok, Lee, Jae Kyung, Lee, Woo Seok, Ko, Tae Gyung, Lee, Chongmu
Format: Article
Language:English
Subjects:
Decoration
Detection
Gas sensors
Indium oxides
Mathematical and Computational Physics
Metal oxides
Nanoparticles
Nanorods
Nitrogen dioxide
Noble metals
Organic chemistry
Particle and Nuclear Physics
Physics
Physics and Astronomy
Properties (attributes)
Roasting
Sol-gel processes
Temperature
Theoretical
물리학
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Summary:The surface-to-volume ratio of one-dimensional (1D) semiconductor metal-oxide sensors is an important factor for achieving good gas sensing properties because it offers a wide response area. To exploit this effect, in this study, we determined the optimal calcination temperature to maximize the specific surface area and thereby the sensitivity of the sensor. The In 2 O 3 nanorods were synthesized by using vapor-liquid-solid growth of In 2 O 3 powders and were decorated with the Pt nanoparticles by using a sol-gel method. Subsequently, the Pt nanoparticle-decorated In 2 O 3 nanorods were calcined at different temperatures to determine the optimal calcination temperature. The NO 2 gas sensing properties of five different samples (pristine uncalcined In 2 O 3 nanorods, Pt-decorated uncalcined In 2 O 3 nanorods, and Pt-decorated In 2 O 3 nanorods calcined at 400, 600, and 800 °C) were determined and compared. The Pt-decorated In 2 O 3 nanorods calcined at 600 °C showed the highest surface-to-volume ratio and the strongest response to NO 2 gas. Moreover, these nanorods showed the shortest response/recovery times toward NO 2 . These enhanced sensing properties are attributed to a combination of increased surface-to-volume ratio (achieved through the optimal calcination) and increased electrical/chemical sensitization (provided by the noble-metal decoration).
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.73.1444