The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimers
We experimentally investigated the practical electromagnetic effects in surface-enhanced Raman scattering (SERS), using the precisely fabricated array of gold nanosquare dimers. The array of gold nanosquare dimers was fabricated by electron-beam exposure and the lift-off process. The Raman spectra o...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2020-02-01
|
| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.5126981 |
| _version_ | 1828835818813259776 |
|---|---|
| author | Satoshi Kaneko Shuhei Watanabe Shintaro Fujii Tomoaki Nishino Manabu Kiguchi |
| author_facet | Satoshi Kaneko Shuhei Watanabe Shintaro Fujii Tomoaki Nishino Manabu Kiguchi |
| author_sort | Satoshi Kaneko |
| collection | DOAJ |
| description | We experimentally investigated the practical electromagnetic effects in surface-enhanced Raman scattering (SERS), using the precisely fabricated array of gold nanosquare dimers. The array of gold nanosquare dimers was fabricated by electron-beam exposure and the lift-off process. The Raman spectra of 1,4-benzenedithiol and 4-aminothiophenol were obtained at room temperature by exciting the longitudinal mode of the plasmon of gold nanodimers. The gap-size dependency of the enhancement factor of the complete symmetric mode clearly exhibited exponential decay with an increase in the gap size. The exponential decay behavior of each mode and molecule did not show a critical difference in the decay constant. The exponential decay of the enhancement factor was explained by the discrete dipole approximation. The pre-exponential factor obtained by the ν7a modes of ATP was much larger than that of BDT; however, the gap-size dependency of the enhancement factor of the ν8a mode did not exhibit a significant difference in the pre-exponential factors between BDT and ATP that reflects the difference in the chemical effects in SERS between vibration modes. By estimating the gap size dependency of the SERS intensity, we were able to compare the intrinsic chemical effects on the SERS enhancement between two molecules. |
| first_indexed | 2024-12-12T18:10:22Z |
| format | Article |
| id | doaj.art-b5409a199c38435d83113bdf460fec55 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-12T18:10:22Z |
| publishDate | 2020-02-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-b5409a199c38435d83113bdf460fec552022-12-22T00:16:24ZengAIP Publishing LLCAIP Advances2158-32262020-02-01102025301025301-510.1063/1.5126981The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimersSatoshi Kaneko0Shuhei Watanabe1Shintaro Fujii2Tomoaki Nishino3Manabu Kiguchi4Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, JapanDepartment of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, JapanDepartment of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, JapanDepartment of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, JapanDepartment of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1 W4-10 Ookayama, Meguro-ku, Tokyo 152-8551, JapanWe experimentally investigated the practical electromagnetic effects in surface-enhanced Raman scattering (SERS), using the precisely fabricated array of gold nanosquare dimers. The array of gold nanosquare dimers was fabricated by electron-beam exposure and the lift-off process. The Raman spectra of 1,4-benzenedithiol and 4-aminothiophenol were obtained at room temperature by exciting the longitudinal mode of the plasmon of gold nanodimers. The gap-size dependency of the enhancement factor of the complete symmetric mode clearly exhibited exponential decay with an increase in the gap size. The exponential decay behavior of each mode and molecule did not show a critical difference in the decay constant. The exponential decay of the enhancement factor was explained by the discrete dipole approximation. The pre-exponential factor obtained by the ν7a modes of ATP was much larger than that of BDT; however, the gap-size dependency of the enhancement factor of the ν8a mode did not exhibit a significant difference in the pre-exponential factors between BDT and ATP that reflects the difference in the chemical effects in SERS between vibration modes. By estimating the gap size dependency of the SERS intensity, we were able to compare the intrinsic chemical effects on the SERS enhancement between two molecules.http://dx.doi.org/10.1063/1.5126981 |
| spellingShingle | Satoshi Kaneko Shuhei Watanabe Shintaro Fujii Tomoaki Nishino Manabu Kiguchi The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimers AIP Advances |
| title | The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimers |
| title_full | The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimers |
| title_fullStr | The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimers |
| title_full_unstemmed | The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimers |
| title_short | The practical electromagnetic effect in surface-enhanced Raman scattering observed by the lithographically fabricated gold nanosquare dimers |
| title_sort | practical electromagnetic effect in surface enhanced raman scattering observed by the lithographically fabricated gold nanosquare dimers |
| url | http://dx.doi.org/10.1063/1.5126981 |
| work_keys_str_mv | AT satoshikaneko thepracticalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT shuheiwatanabe thepracticalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT shintarofujii thepracticalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT tomoakinishino thepracticalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT manabukiguchi thepracticalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT satoshikaneko practicalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT shuheiwatanabe practicalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT shintarofujii practicalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT tomoakinishino practicalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers AT manabukiguchi practicalelectromagneticeffectinsurfaceenhancedramanscatteringobservedbythelithographicallyfabricatedgoldnanosquaredimers |