Research on Multi-Modal Hydrogen Detecting Materials and Sensors
Research on Multi-Modal Hydrogen Detecting Materials and Sensors
- 주제(키워드) hydorgen sensor , gasochromic , WO3 , CuS , Palladium
- 발행기관 아주대학교
- 지도교수 서형탁
- 발행년도 2019
- 학위수여년월 2019. 2
- 학위명 박사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000028809
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Hydrogen has been widely attracted as a renewable energy carrier to replace fossil fuel that causes the greenhouse effect. Fuel cell system to convert H2 to electricity is intensively studied because a process in the energy circulation is carbon free. Hydrogen has been widely attracted as a renewable energy carrier to replace fossil fuel that causes the greenhouse effect. Fuel cell system to convert H2 to electricity has been studied because of minimization of the use in carbon. For the extensive use of the upcoming future energy, infrastructures must be achieved such as storage, transportation, and supply before commercial use. Moreover, hydrogen has nervous issues that involve a characteristic in odorless, colorless and flammable. Among their properties, the explosive characteristic is most nervous consideration, and the problem must be solved for the safety of the worker and ordinary people. For the safety issues, we developed a gasochromic hydrogen sensor. The coloration sensor is divided by reversible and irreversible type. The behavior of each sensor depends on their recovery, and active layer that plays a vital role for the coloration with the reduction and oxidation. In here, the coloration sensor has its own goal, one is for real-time response, and another is for the permanent record of H2 leakage without recovery even after a long time. For the achievement of the goal, various active materials are used such as oxides and chalcogenides with the catalyst that dissociates H2 molecules to a hydrogen atom. In contrast to the coloration sensor for safety, an electrical hydrogen calibration sensor is designed for accurate wide-range hydrogen concentration, which is fabricated with the standard semiconductor fabrication process. In this study, the sensors are fabricated with the various method and analyzed with that electrical, optical and chemical characterization. High performable coloration and electrical sensors show remarkable H2 response in their detecting method. This kind hydrogen sensors will contribute future hydrogen economy.
more목차
Chapter Ⅰ. Introduction 1
Chapter Ⅱ. Research background 5
Ⅱ.1. Tungsten trioxide 5
Ⅱ.2. Palladium 12
Ⅲ.3. Surface Plasmon 20
Ⅳ.4. Gasochromism 27
Chapter Ⅲ. Reversible gasochromic sensor 32
Ⅲ.1. Introduction 32
Ⅲ.2. Experimental procedure 34
Ⅲ.2.1. Material fabrication 34
Ⅲ.2.2. Material characterization 34
Ⅲ.2.3. Coloration measurement 35
Ⅲ.3. Results 36
Ⅲ.4. Conclusion 61
Chapter Ⅳ. Irreversible gasochromic sensor 62
Ⅳ.1. Introduction 62
Ⅳ.2. Experimental procedure 63
Ⅳ.2.1. Material fabrication 63
Ⅳ.2.2. Material characterization 63
Ⅳ.3. Results 65
Ⅳ.4. Conclusion 74
Chapter Ⅴ. Polaron dynamics of the colored WO3 by UV light 75
Ⅴ.1. Introduction 75
Ⅴ.2. Experimental procedure 77
Ⅴ.2.1. Material fabrication 77
Ⅴ.2.2. Material characterization 77
Ⅴ.3. Results 79
Ⅴ.4. Conclusion 101
Chapter Ⅵ. Electrical hydrogen calibrating sensor 102
Ⅵ.1. Introduction 102
Ⅵ.2. Experiment procedure 104
Ⅵ.2.1. Material fabrication 104
Ⅵ.2.2. Material characterization 104
Ⅵ.3. Results 105
Ⅵ.4. Conclusion 124
Chapter Ⅶ. Conclusions 126
References 129
