Research on optimization of composite materials and sensor devices for hydrogen detection
- 주제(키워드) Composite materials , Sensor devices , Hydrogen detection , Hydrogen sensor
- 주제(DDC) 621.042
- 발행기관 아주대학교
- 지도교수 서형탁
- 발행년도 2023
- 학위수여년월 2023. 2
- 학위명 박사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000032764
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
The most important thing in the hydrogen supply chain is the production and supply of hydrogen that supports fuel. However, there is a risk of a hydrogen explosion accident in producing, storing, supplying, and using such hydrogen. Since hydrogen is a colorless and odorless combustible gas, there is no way to confirm that the gas is leaking compared to other combustible gases such as LPG. Therefore, it is necessary to develop a hydrogen sensor that can detect and confirm that hydrogen is leaking. Currently developed hydrogen sensors have a problem in that their performance is poor because they have a simple material structure. In this study, we developed a hydrogen sensor that can solve safety problems by supplementing the problems of currently developed sensors. For the development of the proposed sensor, various composite materials were developed and applied to devices through technology transfer, and the results are presented here. The hydrogen sensor of the WO3 -Pd combination introduced here is a type using an electrical resistance signal with a simple structure. The change in the thickness of tungsten according to the change in deposition time affects the deposited Pd film, and the changing hydrogen reaction mechanism was studied. Herein, we suggest the highly reversible gasochromic hydrogen sensor with a MoO3 active layer with the multilayered Pt-Ni catalysts. The hybrid consisting of mixed-phase MoO3, and multi-layered Pt-Ni revealed a fast responsibility against H2 gas exposure. The focus of this study is to describe a chemochromic reversibility of MoO3, which is challenging to achieve in a typical approach, through the design of a layered Pt-Ni alloy catalyst and the structural change in mixed-phase MoO3. Also, this study introduced our simple route for producing hydrogen-sensitive ink based on MoS2 nanosheets. The sensing performance of the printed MoS2 -Pd sensor was demonstrated and discussed concerning the gap between Cr/Au electrodes (i.e., channel length). A study was also conducted to increase the metal wire and change the structure to a zigzag structure. The resistance of the hydrogen detection layer increased and the area in contact with hydrogen increased, resulting in improved sensitivity characteristics. A hydrogen detection device and system capable of detecting a wide range of hydrogen concentrations were studied using the resulting sensor.
more목차
Chapter 1. Introduction 1
Chapter 2. Research backgrounds 7
2.1. Composite materials 7
2.1.1 Tungsten trioxide (WO3) 7
2.1.2 Molybdenum trioxide (MoO3) 9
2.1.3 Molybdenum disulfide (MoS2) 11
2.1.4 Palladium (Pd) 12
2.1.5 Platinum (Pt) 14
2.2. Electro signal sensor & Devices 15
2.3. Gasochromic sensor 17
Chapter 3. WO3 -Pd Combination & electro sensing 19
3.1 Introduction 19
3.2 Experimental procedure 21
3.2.1 WO3 -Pd thin film deposition 21
3.2.2 Materials characterization 22
3.3 Results 23
3.3.1 Electro-sensing 23
3.3.2 Packaging & Sensor device 33
3.4 Conclusion 40
Chapter 4. Mixed-Phase MoO3 with multi-layered Pt/ Ni/ Pt catalyst & Dual mode detection 41
4.1 Introduction 41
4.2 Experimental procedure 46
4.2.1 Deposition of Pt-Ni on MoO3 thin film 46
4.2.2 Hydrogen sensing test 48
4.2.2.1 Optical sensing test 48
4.2.2.2 Electrical sensing test 49
4.2.3 Materials characterization 52
4.3 Results 53
4.4 Conclusion 81
Chapter 5. Inkjet printing MoS2 nanosheets decorated Pd for hydrogen sensing application 82
5.1 Introduction 82
5.2 Experimental procedure 85
5.2.1 Production of MoS2 nanosheets 85
5.2.2 Deposition of MoS2-Pd thin film 86
5.2.3 Electrical sensing test 86
5.2.4 Materials characterization 87
5.3 Results 88
5.3.1 Characterization of MoS2 -Pd 88
5.3.2 Gas sensing measurements 95
5.4 Conclusion 104
Chapter 6. Alloying of Pd -Ni Nano catalyst for check the purity of hydrogen 105
6.1 Introduction 105
6.2 Experimental procedure 112
6.2.1 Deposition of hydrogen purity sensor chip 112
6.2.2 Electrical sensing test 115
6.2.3 Fabrication of the sensor device 116
6.3 Results 117
6.3.1 Optimization of the sensor chip 117
6.3.2 Application to sensor device 131
6.4 Conclusion 136
Conclusion 137
Reference 140
