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Large-area Raman enhancement substrates using spontaneous dewetting of gold films and silver nanoparticles deposition |
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| Authors: | Tzu-Yi LiaoAuthor Vitae Ba-Yan LeeAuthor VitaeChia-Wei LeeAuthor Vitae Pei-Kuen WeiAuthor Vitae |
| Affiliation: | a Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan b Department of Materials Sciences and Engineering, National Taiwan University, Taipei, Taiwan c Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan d Institute of Biophotonics, National Yang-Ming University, Taipei, Taiwan |
| Abstract: | We present a cost-effective method for making large-area surface enhanced Raman scattering (SERS) substrates by using spontaneous dewetting of ultrathin gold film. The dewetting of 5-nm-thick gold film formed high-density gold islands ranged from 40 nm to 80 nm. The measured SERS signal was 5 times stronger than synthesised gold nanoparticles. The SERS signals can be further increased by depositing small silver nanoparticles on the dewetted film. The experimental results showed 5-nm-thick silver coating increased SERS signals up to 10 times. The calculations by finite-difference time-domain method verified such SERS enhancement originated from enhanced electric fields between gold islands and silver nanoparticles. In the application, we demonstrated an all-optical measurement of pH values in microfluidic devices by using SERS signals of para-mercaptobenzoic acid. |
| Keywords: | Field enhancement Metallic nanostructures Raman spectroscopy pH meter |
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