Selective Detection of Trimethylamine Using Cr2O3-decorated ZnO Nanowire Network Sensors
- 주제(키워드) Nanowire , Trimethylamine , Cr2O3 , Gas Sensors
- 발행기관 고려대학교 대학원
- 지도교수 이종흔
- 발행년도 2012
- 학위수여년월 2012. 2
- 학위구분 석사
- 학과 일반대학원 신소재공학과
- 원문페이지 41 p
- 실제URI http://www.dcollection.net/handler/korea/000000032665
- 본문언어 영어
- 제출원본 000045697004
초록/요약
Highly selective and sensitive detection of trimethylamine (TMA) was achieved by the decoration of discrete Cr2O3 nanoclusters on ZnO nanowire (NW) networks. The Cr2O3 nanoclusters with the size of ~ 5 nm were deposited on ZnO NWs by the thermal reaction of CrCl2 at 630 ？aC, while a continuous Cr2O3 shell layer with thickness of ~20 nm were uniformly coated on ZnO NWs at 670 ？aC. The response to 5 ppm TMA of Cr2O3-decorated ZnO NWs was 17.8 at 400 ？aC, which was 2.4 times higher than that to 5 ppm C2H5OH and 4.3 ？V 8.4 times higher than those to 5 ppm p-xylene, NH3, benzene, C3H8, toluene, CO and H2. In contrast, both of pristine ZnO and ZnO-Cr2O3 core-shell nanocables (NCs) showed the comparable responses to the gases. Highly selective and sensitive detection of TMA by the deposition of Cr2O3 nanoislands on ZnO NW networkswere explained by the catalytic effect of Cr2O3 and the extension of the electron depletion layer via the formation of p-n junctions.
more목차
Abstract
Contents
List of Figures
1. Introduction
2. Experimental
2-1. Preparation
2-2. Characterization
2-3. Gas sensing characteristics
3. Result & Discussion
3-1. SEM and TEM analysis
3-2. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS)
3-3. Gas sensing characteristics
4. Conclusions
References
