NDLI: Biochemical-to-optical signal transduction by pH sensitive organic–inorganic hybrid Bragg stacks with a full color display

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Biochemical-to-optical signal transduction by pH sensitive organic–inorganic hybrid Bragg stacks with a full color display

Content Provider	Royal Society of Chemistry (RSC)
Author	Xie, Jing Li, Yunfeng Wang, Zhanhua Wang, Zhaoyi Zhang, Junhu Shen, Huaizhong Lin, Li Yang, Bai
Copyright Year	2013
Abstract	A synthetic route to attain environment-sensitive thin-film Bragg stacks (BSs) that behave as a kind of visual signal transducer is shown. Herein, organic–inorganic hybrid BSs are fabricated by alternating thin layers of poly(N,N′-dimethylaminoethyl methacrylate) (PDMAEMA) and titanium dioxide through spin-coating, a facile, reproducible and cost-efficient approach. The BSs display bright non-bleaching structural color over the entire visible region, which arises from periodic modulation of the refractive index. Tailoring of optical properties is achieved by regulation of slab periodicity and/or introduction of planar defects. Since alteration of hydrogen ion concentration can cause the swelling transition of the responsive polymeric layer, PDMAEMA, color changes of the as-prepared BSs could be initiated by different pH values of aqueous media. Therefore, transformation of chemical signals into optical effects is obtained for analytical applications. The platform furnishes us an opportunity to realize biochemical-to-optical signal transduction by coupling it with a highly specific enzymatic reaction, glucose oxidation reaction catalyzed by the enzyme glucose oxidase. A dramatic photonic bandgap shift, more than 200 nm, makes it direct and convenient to differentiate the reflective color using the naked eyes. Besides, the intriguing characteristics make the Bragg stacks eminently suitable for other applications, such as environmental monitoring and medical diagnostics.
Starting Page	977
Ending Page	983
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	1
Issue Number	5
Journal	Journal of Materials Chemistry C
DOI	10.1039/c2tc00164k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	PDMAEMA Chromism Transducer Titanium dioxide Structural coloration Ion PH Signal transduction Glycolysis Enzyme Glucose oxidase Photonic crystal Naked Eyes
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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