|
|
| Type |
Poster Presentation |
| Area |
물리화학 |
| Room No. |
포스터발표장 |
| Time |
4월 20일 (목요일) 11:00~12:30 |
| Code |
PHYS.P-17 |
| Subject |
Metal-enhanced photoluminescence of
Au25 on Ag@SiO2 nanoparticles
|
| Authors |
김준기, 장두전*
서울대학교 화학부, Korea
|
| Abstract |
Plasmonic noble metal nanoparticles can significantly interact with closed fluorophores, resulting in fluorescence enhancement. The enhancement relies on near-field enhancement due to SPR induced by metal nanoparticles and is dependent upon the distance between the fluorophore and the plasmonic surface. We report on the metal-enhanced fluorescence of hybrid nanoparticles composed of silver nanoparticles and a promising fluorophore, gold nanoclusters. The photoluminescence spectra of gold nanoclusters-adsorbed to Ag@SiO2 nanoparticles have been investigated systematically with a variation of spatial distances, metal sizes, and excitation wavelengths. The strongest enhancement is observed when the silica shell of the Ag@SiO2 nanoparticle is 6 nm, resulting in an approximately 7-fold increase in emission intensity and a 10-fold increase in quantum yield with a 2-fold reduce in decay time compared to free gold nanoclusters. We have tried to correlate the radiative, metal-modified radiative, nonradiative decay rate with distance-dependence metal-enhanced fluorescence effect. We have also investigated that gold nanoclusters-adsorbed Ag@SiO2 nanoparticles are able to detect heavy metal ions with better sensitive more than free gold nanoclusters. |
| E-mail |
kimj117@snu.ac.kr |
|
119th General Meeting of the KCS