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02월 23일 15시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
Seed-Mediated Growth of Gold Nanoparticles onto Polyelectrolyte Multilayers Films and Capsules
2009년 2월 16일 16시 01분 12초
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금 09시 : 30분
General Topics on Polymer Science II (일반 회원 발표)
한국과학기술연구원 전북분원 복합소재기술연구소, Korea
The field of organic/inorganic nanoparticles and capsule structures has been widely recognized as one of the most promising and rapidly emerging research areas in materials chemistry. Since nanostructures are often inherently unstable owing to their small constituent sizes and high chemical activity, a challenge is needed to increase the chemical, and structural stability of these materials and the devices made there from, in the harsh environment in which the nanostructures are asked to function. In this study, organic/inorganic hybrid polymer films and capsules embedded with gold nanoparticles based on seed-mediated growth will be explored. Use of polyelectrolyte multilayer as a matrix for gold seed adsorption confers controllability on the loading density of the gold nanoparticle film and size of the resulting gold nanoparticles. If the gold nanoparticles were grown as a flat film, optical response of the resulting films was stable due to the good quality of the film and the relatively uniform distribution of the gold nanoparticles over a large area. As a result, the resulting film could find potential optical, sensing applications. We used the AuNP film as a substrate for surface-enhanced Raman scattering (SERS) for molecular sensing, and the resulting films demonstrated stable and reproducible enhancement in the range from 10
depending on the fabrication condition. In case of the growth of gold nanoparticles onto polyelectrolyte multilayered capsules, novel type of polymer capsules with tunable optical property can be prepared. By seed-mediated growth method with capsules added in the growth solution, the stable embedment of gold nanorods onto the capsules was achievable. The resulting capsules complexed with gold nanorods showed stable optical property; pull up with free gold nanorods dispersed in solution. As free gold nanorods do, the capsules exhibit aspect ratio-dependent longitudinal plasmon band which is a characteristic of gold nanorods. This tunable optical property of the capsules would be useful for many technological applications, especially bioapplications in consideration of the near-IR absorbing property of the capsules.
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