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| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
PHYS.P-139 |
| Subject |
Possible Chemical Activities of atomic-scale Plasmonic hot-spots |
| Authors |
Hyun-Hang Shin, Gyu Jin Yeon1, Kang Sup Lee1, Gyouil Jeong, JiWon Park2, Zee Hwan Kim1,*
Division of Chemistry, Seoul National University, Korea
1Department of Chemistry, Seoul National University, Korea
2Chemistry, Seoul National University, Korea
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| Abstract |
The existence of atomic-scale plasmonic hot-spots which are activated on fine structures of metallic nanoparticles such as atomic protrusions is recently reported. Now we show the possible chemical activities of atomic-scale plasmonic hot-spots. The individual 80 nm silver nanoparticle (AgNP) – nitrobenzenethiol (NBT) – gold thin film (AuTF, thickness : 10 nm) junction was illuminated by a laser (wavelength of 632.8 nm) to initiate photo-reduction and to monitor the reaction in real-time (30 ms) on both Stokes and anti-Stokes regions. We found that decay profiles of symmetric NO stretching peak (νNO) are different for anti-Stokes and Stokes. In Stokes, slow component and fast component are mixed but only fast component is in anti-Stokes (fast component is 10 times faster than slow component). Fast component, which appears both in anti-Stokes and Stokes may arise from a subset of NBTs experiencing highly localized field with atomic dimensions. This strongly suggests that atomic-scale hot-spots not only locally enhances electromagnetic field, but it also accelerates the transfer of hot-electrons between metallic surface and the adsorbed NBT. |
| E-mail |
sunabc86@nate.com |
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121st General Meeting of the KCS