Colloidal Photonic Crystals of Reusable Hydrogel Microparticles for Sensor and Laser Applications.

Content Provider	Europe PMC
Author	Iwata, Naoto Koike, Takeru Tokuhiro, Kaya Sato, Ryu Furumi, Seiichi
Copyright Year	2021
Abstract	Although a wide varietyof techniques have been developed to datefor the fabrication of high-quality colloidal photonic crystals (CPCs)using monodisperse silica and polystyrene microparticles, poly(N-isopropylacrylamide) (PNIPA) hydrogel microparticles haverarely been utilized for the preparation of active CPCs despite theintriguing feature of temperature-responsive volume changes. Thisreport describes the promising potential abilities of PNIPA hydrogelmicroparticles for sensor and laser applications. Monodisperse PNIPAhydrogel microparticles were synthesized by emulsion polymerization,and the microparticle diameter was finely controlled by adjustingthe surfactant concentration. Such hydrogel microparticles spontaneouslyformed uniform CPCs with visible Bragg reflection even in fluid suspensions.The addition of small amounts of ionic substances into the centrifugedand deionized CPC suspensions enabled the on-demand color switchingbetween Bragg reflection and white turbidity with temperature, leadingto temperature- and ion-sensing applications. Moreover, our expandingexperiments successfully demonstrated the optically excited laseraction with a single and narrow peak from CPC suspensions with light-emittingdyes by the photonic band gap effect. After the light-emitting dyeswere simply removed from the CPC suspensions by centrifugation, thepurified PNIPA hydrogel microparticles were permanently reusable asthe CPC laser microcavities to generate the laser action at otherwavelengths using different dyes. This study contributes the circulareconomy concept using reusable hydrogel microparticles for the realizationof a sustainable society.
ISSN	19448244
Journal	ACS Applied Materials & Interfaces
Volume Number	13
PubMed Central reference number	PMC8662631
Issue Number	48
PubMed reference number	34821501
e-ISSN	19448252
DOI	10.1021/acsami.1c16500
Language	English
Publisher	American Chemical Society
Publisher Date	2021-11-25
Access Restriction	Open
Rights License	Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). © 2021 The Authors. Published by American Chemical Society
Subject Keyword	photonic crystal hydrogel microparticle reflection temperature response sensor laser photonic band gap reusability
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Medicine Materials Science