Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Role of TiO2 Decoration on SnO2 Nanorods for Highly Sensitive and Selective Acetone Detection

TiO2장식을 통한 SnO2 nanorods의 CH3COCH3 감지 특성 개선

  • Ji-Hyeong Lee (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education) ;
  • Woon-Hyun Jo (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education) ;
  • Heewon Lim (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education) ;
  • Jae-Hwan So (School of Electrical, Electron and Communication Engineering, Korea University of Technology and Education) ;
  • Ha-gyeong Bae (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education) ;
  • Jae Han Chung (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education) ;
  • Young-Seok Shim (School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education)
  • 이지형 (한국기술교육대학교 에너지신소재화학공학부) ;
  • 조운현 (한국기술교육대학교 에너지신소재화학공학부) ;
  • 임희원 (한국기술교육대학교 에너지신소재화학공학부) ;
  • 소재환 (한국기술교육대학교 전기전자통신공학부) ;
  • 배하경 (한국기술교육대학교 에너지신소재화학공학부) ;
  • 정재한 (한국기술교육대학교 에너지신소재화학공학부) ;
  • 심영석 (한국기술교육대학교 에너지신소재화학공학부)
  • Received : 2024.09.02
  • Accepted : 2024.09.11
  • Published : 2024.09.30
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Abstract

In this study, we fabricated TiO2-decorated SnO2 nanorods (TSNRs) via glancing-angle deposition to achieve highly sensitive and selective CH3COCH3 detection. The gas-sensing properties of the TSNRs were systematically investigated, and the optimal sensing performance was achieved at 350℃ by 2-nm-thick TSNRs. When the sensors were exposed to 50 ppm of various gases (CH3COCH3, C2H5OH, C5H8, CH4, and CO), the 2-nm-thick TSNRs demonstrated a 4.6-fold increase in response (Ra/Rg-1=134) to CH3COCH3 compared with bare SnO2 nanorods (Ra/Rg-1=29.5) and exhibited excellent selectivity. In a high-humid environment (relative humidity = 80%), the 2-nm-thick TSNRs indicated a low theoretical detection limit of ≈5.31 ppb for CH3COCH3. These results suggest the significant potential of the proposed sensor for use in Internet-of-Things applications, particularly under extreme environmental conditions.

Keywords

Acknowledgement

본 논문은 2024년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 지자체-대학 협력기반 지역혁신 사업의 결과입니다(2021RIS-004). 이 논문은 한국기술교육대학교 산학협력단 공용장비센터의 지원으로 연구되었음.

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