An interacting metal-insulator-metal resonator by nanoporous silver and silk protein membranes and its water sensing application : 나노 다공성 은막과 실크 단백질 막으로 이루어진 금속-절연체-금속 공진기를 이용한 물 감지 센서
- 주제(키워드) Silk Polymer , Interacting with environment , Metal-insulator- Metal , optical resonator , Water sensor
- 발행기관 아주대학교
- 지도교수 Sunghwan Kim
- 발행년도 2020
- 학위수여년월 2020. 2
- 학위명 석사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000029584
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Planar and lithography-free metal–insulator–metal (MIM) resonators based on the Fabry–Pérot etalon are attractive for biochemical sensing applications due to acceptable optical performance and cost-effectiveness. However, to injecting analytes into the insulating layer where the optical field is localized (high light–matter interaction) is difficult. Here, planar and lithography-free MIM resonators interacting with their environment are reported. In the MIM, molecules of a liquid can infiltrate the inherent nanopores in the deposited silver nanomembrane and be absorbed into the silk protein hydrogel membrane. The silk layer is swollen when water molecules are absorbed, inducing a large shift in the resonance wavelength. Thus, in this study, the proposed MIM resonator was applied as a highly sensitive water sensor, and a water content as low as 0.008% in organic solvents could be determined by reading the shift in the transmission peak. This limit can be lowered further by using a high-resolution spectrometer and a thicker silk layer. In addition, the area of interaction can be artificially selected by applying an elastomer stamp and a patterned photoresist window.
more목차
1. Introduction 1
2. Properties of silk & Theory 3
2.1. Properties of silk 3
2.2. Crystallized silk 5
2.2.1. Methanol (MeOH) treatment 5
2.2.2. Water vapor annealing 5
2.3. Fabry-Perot resonator 7
3. Methods 8
3.1. Preparation of silk aqueous solution. 8
3.2 Fabrication of MIM resonators. 9
3.3. Photoresist window using photolithography. 11
3.4. Selective wetting by PDMS molds. 13
3.5. FDTD Simulation. 14
4. Results 15
4.1. Optical response of color filter in air and water 15
4.2. Diffusion of water through nanoporous Ag layer with different thicknesses 18
4.3. Effect of the nanopore size on the FP etalon 21
4.4. Effect of the numbers of nanopores on the FP etalon 23
4.5. Large nanopores on the MIM cavity 25
4.6. Sensing of water in Acetone and IPA 27
4.7. Selective wetting through PDMS 30
4.8. Selective wetting through PR MIM 32
5. Conclusion 34
References 35
