Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Synthesis of Ce-doped In2O3 nanoparticles via a microwave-assisted hydrothermal pathway and their application as an ultrafast breath acetone sensor

  • Byeong-Hun Yu (Department of Electronic and Information Materials Engineering, Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Sung Do Yun (Dongnam Division, Korea Institute of Industrial Technology) ;
  • Chan Woong Na (Dongnam Division, Korea Institute of Industrial Technology) ;
  • Ji-Wook Yoon (Department of Electronic and Information Materials Engineering, Division of Advanced Materials Engineering, Jeonbuk National University)
  • Received : 2023.11.07
  • Accepted : 2023.12.21
  • Published : 2023.12.31
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Abstract

Acetone, a metabolite detected from the exhaled breath of people doing a diet, can be used for non-invasive monitoring of diet efficiency. Thus, gas sensors with rapid response and recovery characteristics to acetone need to be developed. Herein, we report ultrafast acetone sensors using Ce-doped In2O3 nanoparticles prepared by the one-pot microwave-assisted hydrothermal method. The pure In2O3 sensor shows a high response and fast response time (τres = 6 s) upon exposure to 2 ppm acetone at 300 ℃, while exhibiting a relatively sluggish recovery speed (τrecov = 1129 s). When 20 wt% Ce is doped, the τrecov of the sensor significantly decreased to 45 s withholding the fast-responding characteristic (τres = 6 s). In addition, the acetone response (resistance ratio, S) of the sensor is as high as 5.8, sufficiently high to detect breath acetone. Moreover, the sensor shows similar acetone sensing characteristics even under a highly humid condition (relative humidity of 60%) in terms of τres (6 s), τrecov (47 s), and S (4.7), demonstrating its high potential in real applications. The excellent acetone sensing characteristics of Ce-doped In2O3 nanoparticles are discussed in terms of their size, composition, phase, and oxygen adsorption on the sensing surface.

Keywords

Acknowledgement

This work was supported by the R&D program for Forest Science Technology (Project No. "FTIS 201382C10-2221-0101) provided by Korea Forest Service (Korea Forestry Promotion Institute), and Korea Institute of Marine Science & Technology Promotion (KIMST) funded by the Ministry of Oceans and Fisheries (RS-2023-00239826). This work was also carried out with the support of "Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ016994)" Rural Development Administration, Republic of Korea.

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