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Article

Synthesis of High-Performance Photonic Crystal Film for SERS Applications via Drop-Coating Method

1
Department of Resource Engineering, National Cheng Kung University, Tainan 701, Taiwan
2
Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
3
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan
4
General Education Center, National Tainan Junior College of Nursing, Tainan 700, Taiwan
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(7), 679; https://doi.org/10.3390/coatings10070679
Received: 16 June 2020 / Revised: 13 July 2020 / Accepted: 14 July 2020 / Published: 15 July 2020
(This article belongs to the Special Issue Nanofabricated Surfaces for Biomedical Applications)
Silica nanospheres with a well-controlled particle size were prepared via a nucleation-to-growth synthesis process. A facile method is proposed for improving the self-assembly behavior of silica colloidal particles in droplet coatings by the simple controlling of the drying temperature. It is shown that a periodically arranged, opal-structured, photonic crystal film with a large area of approximately 4.0 cm2 can be prepared, even when the particle size is up to 840 nm. When the band gap of the silica photonic crystals falls in the visible-light region, the crystals exhibit distinct structural colors. Moreover, the wavelength of the reflected light increases with an increasing particle size of silica. When the photonic band gap overlaps the wavelength of the laser source, the overall Raman spectrum intensity is significantly enhanced. Accordingly, the proposed nucleation-to-growth process and drop-coating method provides a cheap and simple approach for the manufacture of uniform sized silica and surface-enhanced Raman scattering substrates, respectively. View Full-Text
Keywords: drop-coating; colloidal crystal; SERS substrate; photonic crystal; structural color drop-coating; colloidal crystal; SERS substrate; photonic crystal; structural color
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MDPI and ACS Style

Wei, M.-X.; Liu, C.-H.; Lee, H.; Lee, B.-W.; Hsu, C.-H.; Lin, H.-P.; Wu, Y.-C. Synthesis of High-Performance Photonic Crystal Film for SERS Applications via Drop-Coating Method. Coatings 2020, 10, 679. https://doi.org/10.3390/coatings10070679

AMA Style

Wei M-X, Liu C-H, Lee H, Lee B-W, Hsu C-H, Lin H-P, Wu Y-C. Synthesis of High-Performance Photonic Crystal Film for SERS Applications via Drop-Coating Method. Coatings. 2020; 10(7):679. https://doi.org/10.3390/coatings10070679

Chicago/Turabian Style

Wei, Ming-Xue, Chao-Hui Liu, Han Lee, Bo-Wei Lee, Chun-Han Hsu, Hong-Ping Lin, and Yu-Chun Wu. 2020. "Synthesis of High-Performance Photonic Crystal Film for SERS Applications via Drop-Coating Method" Coatings 10, no. 7: 679. https://doi.org/10.3390/coatings10070679

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