| 학회 | 한국재료학회 |
| 학술대회 | 2018년 가을 (11/07 ~ 11/09, 여수 디오션리조트) |
| 권호 | 24권 2호 |
| 발표분야 | 6. 의료기기 핵심 뿌리기술 심포지엄(Symposium on material science for biomedical device)-오거나이저: 김현종 박사(KITECH) |
| 제목 | Development of Novel Nanocomposite Materials for Advanced Bioelectronics and Sensors |
| 초록 | Novel nanocomposite materials with excellent electronic and optical performance are crucial for the development of next-generation biomedical products. We developed a novel method for fabricating the micropatterning of conductive materials such as metal nanowires and conductive polymers on hydrogels via poly(ethylene glycol) (PEG) photolithography. At first, conducting polymer film was prepared on a glass by a simple method. After UV induced PEG gelation at the conductive material surface through photo-mask, cross-linked PEG hydrogel was peeled off at PEDOT or AgNWs/PEG hydrogel interface to cause detachment of PEDOT or AgNW film from a glass substrate. As a result, the remaining region of PEDOT or AgNW film showed clear conductive polymer micropatterns which exhibit a high conductivity. Furthermore, we also demonstrated the direct transfer process of PEDOT patterns from a glass to various hydrogel substrates such as PEG, agarose, and polyacrylamide via second gelation process. The electrical performance of PEDOT or AgNW didn’t show significant difference between a glass and hydrogel substrates. PEDOT or AgNW micropatterns on biocompatible hydrogels revealed great mechanical flexibility and superior stability under wet conditions. We also developed a transparent and flexible surface enhanced Raman scattering (SERS) substrate based on gold nanoparticles (AuNPs) and 2,2,6,6-tetramethylpiperidine-1-oxy (TEMPO)-oxidized cellulose nanofiber (TEMPO-CNF) nanocomposites via a simple vacuum-assisted filtration. TEMPO-CNFs have good physical properties such as high elastic modulus and low thermal expansion as well as optical transparency (＞ 85 % at 550 nm). The filtration process allows us to control the number density and size ratio of AuNPs, which are strongly associated with signal intensity. The resultant AgNW deposited nanopaper high sensitivity with good reproducibility and stability. Importantly, the transparent nanopaper enables back excitation and collection through the substrate with well-defined SERS signal, allowing for in-situ detection of target hazardous molecules. Furthermore, paper-based swab provide rapid and sensitive detection of pesticide residues on real-world surfaces by taking advantage of highly flexible nanopaper. We envision that the AuNPs/TEMPO-CNF nanocomposite could be an inexpensive and effective SERS platform for rapid in situ detection of hazardous chemicals. |
| 저자 | 김다범, 고영상, 권구민, 유정목 |
| 소속 | 경희대 |
| 키워드 | <P>바이오일렉트로닉스; 마이크로 전극; SERS; 나노셀룰로오스</P> |
