Formation of Interstitial Hot-Spots Using the Reduced Gap-Size between Plasmonic Microbeads Pattern for Surface-Enhanced Raman Scattering Analysis
- Authors
- Lee, Taeksu; Jung, Sanghee; Kwon, Soongeun; Kim, Woochang; Park, Jinsung; Lim, Hyungjun; Lee, JaeJong
- Issue Date
- 1-3월-2019
- Publisher
- MDPI
- Keywords
- nano-imprint lithography; SERS; electrodeposition; nano patterning; gold; silver; nano-gap
- Citation
- SENSORS, v.19, no.5
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS
- Volume
- 19
- Number
- 5
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/67034
- DOI
- 10.3390/s19051046
- ISSN
- 1424-8220
- Abstract
- To achieve an effective surface-enhanced Raman scattering (SERS) sensor with periodically distributed hot spots on wafer-scale substrates, we propose a hybrid approach combining physical nano-imprint lithography and a chemical deposition method to form a silver microbead array. Nano-imprint lithography (NIL) can lead to mass-production and high throughput, but is not appropriate for generating strong hot-spots. However, when we apply electrochemical deposition to an NIL substrate and the reaction time was increased to 45 s, periodical hot-spots between the microbeads were generated on the substrates. It contributed to increasing the enhancement factor (EF) and lowering the detection limit of the substrates to 4.40 x 10(6) and 1.0 x 10(-11) M, respectively. In addition, this synthetic method exhibited good substrate-to-substrate reproducibility (RSD < 9.4%). Our research suggests a new opportunity for expanding the SERS application.
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Collections - Graduate School > Department of Control and Instrumentation Engineering > 1. Journal Articles
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