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Updated: May 16, 2025
Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
Detection of isomers based on silica colloidal crystals doped with noble metals
Chunyang Zhang1, Jie Liu1, Chengjia Xiong2
1School of Building and Materials Engineering, Hubei University of Education, Wuhan 430205, PR China.
Abstract:
Structural colors (or stopbands) of different photonic crystals (PCs) could be changed by doping different concentrations of noble metals. The maximum stopband shift of PCs is about 61 nm when Pd colloid nanoparticles are doped into the PCs. Varied of PCs have been used for detecting chemicals, but it is uncommon for detection of isomers based on the simple PCs from SiO2 spheres and noble metals. Although difference of refractive indices of m-xylene and p-xylene is only 0.002, after noble metals as intermedium are doped into PCs, difference of the total average stopband shifts is about 37 nm. The total stopband shifts are related to diameters of SiO2 spheres, species of analytes, doping amounts and kinds of noble metal nanoparticles. The proposed strategy provides a convenient, cheap, trace detection method to distinguish isomers. These PCs have potential applications in display, isomer recognition and anti-counterfeiting.
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