Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Optimization of the Pt Nanoparticle Size and Calcination Temperature for Enhanced Sensing Performance of Pt-Decorated In2O3 Nanorods

  • Choi, Seung-Bok (Department of Mechanical Engineering, Inha University) ;
  • Lee, Jae Kyung (Department of Materials Science and Engineering, Inha University) ;
  • Lee, Woo Seok (Department of Materials Science and Engineering, Inha University) ;
  • Ko, Tae Gyung (Department of Materials Science and Engineering, Inha University) ;
  • Lee, Chongmu (Department of Materials Science and Engineering, Inha University)
  • Received : 2018.07.05
  • Accepted : 2018.07.25
  • Published : 2018.11.30
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Abstract

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 $In_2O_3$ nanorods were synthesized by using vapor-liquid-solid growth of $In_2O_3$ powders and were decorated with the Pt nanoparticles by using a sol-gel method. Subsequently, the Pt nanoparticle-decorated $In_2O_3$ nanorods were calcined at different temperatures to determine the optimal calcination temperature. The $NO_2$ gas sensing properties of five different samples (pristine uncalcined $In_2O_3$ nanorods, Pt-decorated uncalcined $In_2O_3$ nanorods, and Pt-decorated $In_2O_3$ nanorods calcined at 400, 600, and $800^{\circ}C$) were determined and compared. The Pt-decorated $In_2O_3$ nanorods calcined at $600^{\circ}C$ 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).

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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