Highly Durable, Flexible, and Conductive Silver Nanowire Film for Transparent Electromagnetic Interference Shielding
Highly Durable, Flexible, and Conductive Silver Nanowire Film for Transparent Electromagnetic Interference Shielding
- 주제(키워드) silver nanowire
- 발행기관 고려대학교 대학원
- 지도교수 이관영, 김상우
- 발행년도 2019
- 학위수여년월 2019. 2
- 학위구분 석사
- 학과 대학원 화공생명공학과
- 원문페이지 61 p
- 실제URI http://www.dcollection.net/handler/korea/000000083301
- UCI I804:11009-000000083301
- DOI 10.23186/korea.000000083301.11009.0000825
- 본문언어 영어
- 제출원본 000045978702
초록/요약
The flexible and foldable devices released electromagnetic wave and are exposed to cyclic fatigue with repeated bending. Electromagnetic wave emissions can cause product malfunction and human health hazards. Therefore, flexible electromagnetic shielding and durability strategies for repeated fatigue are becoming increasingly necessary. In this study, we fabricated a transparent silver nanowire (SNW) electromagnetic interference (EMI) shielding film by wet sintering process, which can enhance NW networking structure. We also improved durability of that film using hexadecyltrimethoxysilane (HDTMS) and polyurethane elastomer (PE). The wet-sintered silver nanowire (SSN) shielding film had a threshold radius of curvature (ROC) of 0.8 mm at a film thickness of 100 μm, which indicated high flexibility, whereas a threshold ROC of the conventional indium tin oxide (ITO) shielding film is more than 6 mm. the threshold ROC of graphene (G) /PE/SSN film decreases by half time from 0.8 to 0.43 mm than as compared to SSN film. The variation of the resistance changes (ΔR/R0) of hydrophobic coating (HC)/PE/SSN film on 25 μm PET is no changed and that film maintains constant contact angle after 300,000 cycles of bending test at 2 mm ROC. The electromagnetic interference (EMI) shielding effectiveness (SE) of the PE/SSN film was approximately twice that of the ITO film at a similar relative transmittance 85%. The HC/PE/SSN film showed high temperature and humidity durability with little change in the resistance over 300 h at 85 °C and 85% relative humidity due to the hydrophobic coating layer. The multilayer film exhibited high flexibility, durability, high shielding performance 24.22 dB at a relative transmittance of 85.5%, making it highly applicable for use as a transparent shielding material for future foldable and flexible devices.
more목차
Chapter 1. Introduction 1
1.1. Research background 1
1.2. Characteristics of conventional transparent EMI shielding materials 2
1.3. Properties of transparent silver nanowire EMI shielding film 4
1.4. Transparent EMI shielding film with high flexibility and durability 7
Chapter 2. Experiment 8
2.1. Materials 8
2.2. Synthesis of hydrophobic coating solution 9
2.3. Preparation of transparent EMI silver nanowire films 10
2.4. Characterizations and analysis 11
Chapter 3. Results and Discussion 13
3.1. Electrical and EMI shielding properties 13
3.2. Bending properties and durability 18
3.3. Humidity durability 31
3.4. Water repellency and surface analysis 33
3.5. Adhesion properties 40
Chapter 4. Conclusions 43
References 44
