| 학회 |
한국재료학회 |
| 학술대회 |
2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 |
27권 2호 |
| 발표분야 |
특별심포지엄 2. 환경 센서 소자 및 소재 연구 동향 심포지엄-오거나이저: 류학기(아주대) |
| 제목 |
Cost-effective Plasmonic Black Metal Nanostructures for Surface-enhanced Raman Spectroscopy |
| 초록 |
When metals are evaporated in relatively high pressure like a few Torr, highly porous nanostructures can be formed instead of dense metal films. These metal nanostructures induces multiple scattering of the incoming light resulting in low reflectance. The reflectance varies depending on the pressure that affects the homogeneous nucleation and growth of the evaporated metals and is close to zero at optimum process condition. Due to the black appearance these nanostructures are so called black metals or metal smokes. As spherical nanoparticles are connected inside the nanostructures, there exist lots of nano-gaps between the nanoparticles, which causes plasmonic effect for the electromagnetic wave around the nanostructure. As these metal nanostructures were applied to surface-enhanced Raman spectroscopy (SERS), highly enhanced SERS activity could be obtained compared to commercial SERS substrates. FDTD simulations showed that electric field were quite enhanced around the nano-gaps between nanoparticles, which causes the plasmonic effect. These plasmonic nanostructures of metals have higher enhancement factor rather than the sensitivity compared to SERS substrates. The simple thermal evaporation of metals under high pressure demonstrated in this presentation enables a large scale production, the formation of the nanostructures onto any kind of substrates, and it does not require complex steps such as lithograph and chemical etching. These advantages can open up a new cost-effective route for chemical sensors that need highly porous structures as well as SERS substrates. |
| 저자 |
Sangwoo Ryu |
| 소속 |
Department of Advanced Materials Engineering |
| 키워드 |
surface-enhanced Raman spectroscopy; high pressure thermal evaporation; homogeneous nucleation and growth; plasmonic metal nanostructures
|
| E-Mail |
|
