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Biosens Bioelectron. 2019 Oct 15;143:111596. doi: 10.1016/j.bios.2019.111596. Epub 2019 Aug 14.

Plasmonic-3D photonic crystals microchip for surface enhanced Raman spectroscopy.

Author information

1
Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China.
2
Instrumental Analysis and Research Center, Sun Yat-sen University, Guangzhou, 510275, China.
3
Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China. Electronic address: hongwei9@mail.sysu.edu.cn.
4
Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China. Electronic address: cescxd@mail.sysu.edu.cn.

Abstract

Plasmonic-dielectic hybrid substrates of Ag-islands on three-dimensional photonic crystals are fabricated through magnetron sputtering of silver onto hydrophobized silica photonic crystals, free from etching process. Without typical "hot-spots" such as nanogaps, significant Raman enhancements can be achieved, attributed to the enhanced electromagnetic field and scattering of the plasmonic nanoparticles as well as the enhanced light-matter interaction by the slow photon effects. The detection limit for adenine by the hybrid substrates reaches nM level, with a calculated enhancement factor of 1.13 × 107, which is three orders of magnitude higher than the conventional noble metal film over nanosphere (FON) control group. Furthermore, microchips based on the hybrid substrates are facilely achieved, enabling micro-detection through super hydrophobic concentration. The facile fabrication and effective Raman enhancements make the Ag-islands on 3D photonic crystals promising candidates in the field of chemical sensors, Raman mapping and bioassays.

KEYWORDS:

Biosensor; Microchips; Plasmonic particles; Slow-photon effect; Surface enhanced-Raman scattering; Three dimensional photonic crystals

PMID:
31442754
DOI:
10.1016/j.bios.2019.111596

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