Hydrothermal synthesis of ZnO nanowire arrays for gas sensor application
- 주제(키워드) ZnO , nanowire , hydrothermal , gas sensor
- 발행기관 고려대학교 대학원
- 지도교수 김영근
- 발행년도 2014
- 학위수여년월 2014. 8
- 학위구분 석사
- 학과 일반대학원 신소재공학과
- 원문페이지 56 p
- 실제URI http://www.dcollection.net/handler/korea/000000052286
- 본문언어 영어
- 제출원본 000045808735
초록/요약
We report the hydrothermal synthesis of highly crystallized ZnO nanowire arrays for gas sensor applications. Seven types of samples including pure ZnO, 1 at.% Fe-doped ZnO, 3 at.% Fe-doped ZnO, 5 at.% Fe-doped ZnO, 7 at.% Fe-doped ZnO, 1 at.% Sn-doped ZnO, 3 at.% Sn-doped ZnO were prepared via hydrothermal method. The morphological and microstructural properties of the ZnO nanowire arrays were analyzed by field emission scanning electron microscope, transmission electron microscope, X-ray diffraction and X-ray photoelectron spectroscopy. The 5 at.% Fe-doped ZnO nanowire array sensor showed high response of 96.7 at 350℃ and short response time and recovery time as well under 100 ppm of formaldehyde (HCHO) gas. 3 at.% Fe-doped ZnO were 5.0 times sensitive to formaldehyde (HCHO) than ammonia (NH3).
more목차
Chapter 1. Introduction --- 1
Chapter 2. Theoertical Background --- 4
2.1. ZnO nanowires --- 4
2.2. Hydrothermal synthesis of ZnO nanowires --- 8
2.3. Gas sensing mechanism of metal oxide gas sensor --- 12
Chapter 3. Experimental Section --- 17
3.1. Preperation of seed layer --- 17
3.2. Synthesis ZnO nanowires --- 18
3.3. Organization of sensor measurement system --- 21
Chapter 4. Results and discussion --- 23
4.1. Morphological and structural analysis --- 23
4.2. Gas sensing property analysis --- 32
Chapter 5. Conclusions --- 44
References --- 45
