Abstract
Fabrication of Inverse Opal Photonic Crystals with Mesopores Using Binary Colloidal Co-assembly Method for Signal Enhancement of Formaldehyde Detection
Highlights
Photonic crystal (PC)-based sensors for the detection of chemical substances have been proposed.[1,2,3] photonic crystal (PC) are structures having a periodic distribution of the refractive index, and a photonic bandgap, in which a certain wavelength range of light cannot exist, appears in the structure
A fabrication method for inverse opal photonic crystals (IOPCs), i.e., the co-assembly method, proposed by Hatton et al makes it easy to fabricate IOPCs with high porosity, which have been used for gas sensing.[5]. Because PCs do not have specific reactivity to chemical substances, to realize specificity, they must be formed with a functional material that reacts with a target substance
We investigated whether introducing mesopores into an IOPC was effective in proving its performance in formaldehyde detection. 1.0 mL of 2.5% PS 0.5 mm microspheres was used for the fabrication of a 500 nm IOPC (500IOPC) in the same manner as in the case of 350IOPC. 100 μL of 1.0 wt% Fluoral-P in methanol solution was added dropwise to 50 nm-350IOPC, Fig. 2. (Color online) Experimental setup for spectral measurement on IOPCs
Summary
Photonic crystal (PC)-based sensors for the detection of chemical substances have been proposed.[1,2,3] PCs are structures having a periodic distribution of the refractive index, and a photonic bandgap, in which a certain wavelength range of light cannot exist, appears in the structure. A fabrication method for inverse opal photonic crystals (IOPCs), i.e., the co-assembly method, proposed by Hatton et al makes it easy to fabricate IOPCs with high porosity, which have been used for gas sensing.[5] Because PCs do not have specific reactivity to chemical substances, to realize specificity, they must be formed with a functional material that reacts with a target substance. The surface of an IOPC modified with a reagent can interact with the target substance
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