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

Coatings

Chao-Hui Liu¹  Hong-Ping Lin¹  Han Lee²  Ming-Xue Wei³  Bo-Wei Lee³  Yu-Chun Wu³  Chun-Han Hsu⁴ 

[1] Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan;Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan;Department of Resource Engineering, National Cheng Kung University, Tainan 701, Taiwan;General Education Center, National Tainan Junior College of Nursing, Tainan 700, Taiwan;

关键词: drop-coating;    colloidal crystal;    SERS substrate;    photonic crystal;    structural color;   

DOI  :  10.3390/coatings10070679

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown