| Budget Amount *help |
¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
A gold particle dimer shows huge electromagnetic enhancement when particle connection direction is matched to polarization direction of incident light. In this study the dimers were arrayed by the nanotrench-guided self-assembly for generating huge total Raman enhancement. The fabricated structures were characterized for Surface-Enhanced Raman Spectroscopy (SERS) depending on polarization angle to particle connection direction. The Raman intensity increased with decreasing the angle. Since electromagnetic interaction between dimers has large effect on Raman enhancement, the distance between dimers were optimized. The distance of 100 nm between dimers showed the highest Raman intensity. The optimized structure detected 4,4'-bipyridine molecules at the concentration of 10 pM. The detection for 100 nM solution was possible at the integration time of 0.2 s. This developed SERS substrate is expected to be applied to various trace analysis with high sensitivity and short detection time.
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