TiO2장식을 통한 SnO2 nanorods의 CH3COCH3 감지 특성 개선
Role of TiO2 Decoration on SnO2 Nanorods for Highly Sensitive and Selective Acetone Detection
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In this study, we fabricated TiO2-decorated SnO2 nanorods (TSNRs) via glancing-angle deposition to achieve highly sensitive andselective CH3COCH3 detection. The gas-sensing properties of the TSNRs were systematically investigated, and the optimal sensing performance was achieved at 350oC 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.
Abstract
In this study, we fabricated TiO2-decorated SnO2 nanorods (TSNRs) via glancing-angle deposition to achieve highly sensitive andselective CH3COCH3 detection. The gas-sensing properties of the TSNRs were systematically investigated, and the optimal sensing performance was achieved at 350oC 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.
참고문헌 (23)
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