Iridescent Colloidal Crystals Composed of SiO2Porous Hollow Sphere for SERS Application

Chao Hui Liu, Ming Xue Wei, Chun-Han Hsu, Hong-Ping Lin, Yu Chun Wu

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

In recent years, the application of low-refractive-index materials in the optical field has attracted considerable attention due to it high transmittance and high optical sensitivity. In this study, we synthesized SiO2 porous hollow spheres (SPHS) with an ultralow refractive index (n = 1.05) by using a templating method. Their refractive indices could be easily controlled from 1.05 to 1.08 by tuning the thickness of shell. In addition, a droplet coatings method is proposed for SPHS colloidal crystal (CC) by controlling the temperature and humidity. The SPHS CCs displayed distinct structural colors when the incident angle was adjusted and demonstrated high angular resolution. Moreover, the iridescent color changes could be observed with the naked eye. For surface-enhanced Raman scattering application, more analyte could be absorbed by the porous shells, and metal nanoparticles were coated on the SPHSs surface to increase the hot spot density for improving the SERS intensity.

原文English
期刊Langmuir
DOIs
出版狀態Accepted/In press - 2022

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 表面和介面
  • 光譜
  • 電化學

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