| 학회 | 한국재료학회 |
| 학술대회 | 2018년 가을 (11/07 ~ 11/09, 여수 디오션리조트) |
| 권호 | 24권 2호 |
| 발표분야 | E. 환경/센서 재료 분과 |
| 제목 | Au decoration of vertical hematite nanotube arrays for further selective detection of acetone in exhaled breath |
| 초록 | Metal oxide-based gas sensors have attracted enormous attention for various applications such as the detection of air pollutants and gaseous hazards, fuel combustion control, and medical diagnosis owing to simplicity in operation, low cost, flexibility in production and small size, and easy integration with electronic circuits. Over the past decade, the use of metal oxide nanostructures with or without additives such as noble metal has significantly enhanced transducer function, utility factor, and receptor function of metal oxide-based gas sensors for high performances. Recently, numerous studies have been conducted to identify the role of the surface additives and subsequently enhance the gas sensing properties of metal oxide nanostructures. In this study, we report the ultrahigh sensitive and selective gas sensors based on Au-decorated hematite nanotubes. Au-decorated hematite nanotubes have been synthesized using an anodic oxidation and self-agglomeration of Au film. Our results show that the responses of the Au-decorated hematite nanotubes to various gases such as CH3COCH3, C2H5OH are at leat 5 times higher than those of bare hematite nanotubes. The resonse enhancement by Au decoration is dependent on the target gas, which is attributed to an interplay between electronic and chemical sensitizations. Especially, the Au-decorated hematite nanotubes exhibit extremely high sensitivities and selectivities, and ppd-level detection limits to CH3COCH3 at 350 oC. These results suggest that the Au-decorated hematite nanotubes are possible fore application of breath analyzers to diagnose from diabetes mellitus exhaled human breath. |
| 저자 | 김태훈1, 김도홍2, 손운배1, 서준민1, 심영석1, 권기창1, 홍구택1, 최석훈1, 변형기3, 이종흔2, 장호원1 |
| 소속 | 1서울대, 2고려대, 3강원대 |
| 키워드 | <P>hematite nanotubes; acetone sensor; Au catalyst; anodization; diabetes mellitus</P> |
