Biopolymer-Based Optoelectronic Device Using Melanin Nanoparticles in a Silk-Elastomer Hybrid : 실크 엘라스토머 하이브리드에서 멜라닌 나노 입자를 사용하는 바이오 폴리머 기반 광전자 장치
- 주제(키워드) Melanin nanoparticle , photoconductivity , silk protein , artificial skin , sensors , optoelectronics
- 발행기관 아주대학교
- 지도교수 Sunghwan Kim
- 발행년도 2019
- 학위수여년월 2020. 2
- 학위명 석사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000029565
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Melanin is a broad class of dark polymeric pigmentary macromolecules found through nature that perform a wide range of activities such as photo-protection and free radical scavenging, UV-Vis light absorption and mixed electronic-ionic conductivity. Owing to their broad visible absorption, melanin particles are photoprotective agents for human against solar radiation. Melanin’s can also participate in charge transfer reaction, as evidenced by their ability of redox process in the water. From the electron spin resonance (ESR) analysis, it was assumed that ionic conduction in the melanin is being by the proton in the hydrated state. The most common approach of using this material as a humidity sensor and pH detector depending on its hydration condition. Moreover, the electrical devices made by using melanin nanoparticles (MNPs) exhibited an electrical switching behavior, which indicated its potentiality to use an active material for electronics. In this dissertation, I will present a biopolymer-based optoelectronic using melanin nanoparticle (MNP) dispersion in a silk hydrogel– PDMS elastomer hybrid and demonstrate its application as a dopamine sensor and a UV-index meter. MNPs dispersed in water were placed in the elastomer reservoir with integrated silver nanowire electrodes and a transparent silk hydrogel window cover; they exhibited semiconducting behavior with increased conductivities compared with those of dehydrated MNPs. Enhanced generation of free radicals by light illumination resulted in an increase of the electrical conductivity. In addition, the artificial optoelectronic skin interacted with its environment through the silk hydrogel window.
more목차
1. INTRODUCTION 1
2. MATERIALS PROPERTY 3
2.1. Properties of Melanin 3
2.2. Properties of Polydimethylsiloxane (PDMS) 5
2.2.1 Cross-linking 5
2.2.2 Oxidation 6
2.3. Structure and properties of silk 7
2.4 Crystallization of silk 9
2.4.1. Methanol (MeOH) treatment 9
2.4.2 Water vapor annealing 9
2.4.3 Glycerol addition 9
3. METHODS 12
3.1. Synthetic MNPs preparation 12
3.2. PDMS reservoir and silk hydrogel layer 12
3.3. Fabrication of optoelectronic device 13
3.4. Optical analysis process 15
3.5. Electrical measurement method 15
4. RESULTS 16
4.1. Morphological and optical Properties 16
4.2. Electrical Properties of optoelectronic device 20
4.3 Photo-current behaviors of optoelectronic device 24
4.4. Application of Optoelectronic Device 30
5. CONCLUSION 33
REFERENCE 34
