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Proceedings Paper

Three-dimensional photonic crystal sensors
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Paper Abstract

Photonic crystal templating of optically active hydrogel sensors is a topic of growing interest in materials chemistry. When interactions between a mesostructured hydrogel and the analyte molecules cause a reversible dimensional change of the hydrogel, the corresponding change in optical diffraction can be detected either spectroscopically or visually. Using poly(styrene) photonic crystals as templates, we synthesized inverse opal hydrogels through photopolymerization of 2-hydroxyethylmethacrylate and various functional monomers, and demonstrated the ability to sense pH and glucose at different ionic strengths and other experimental conditions. The diffraction of the pH sensitive hydrogel shifted from 544 nm to 850 nm when the pH was increased from 4 to 7, while the diffraction of the glucose sensitive hydrogel changed from 599 nm to 719 nm when the glucose concentration was raised from 0 mM to 100 mM. Diffraction response kinetics on the order of ~30 minutes were observed, which may be attributed to diffusion of analyte molecules through thin (12 - 24 μm) hydrogel samples. These mechanically robust inverse opal hydrogel sensors may form a starting point for chemical and biological sensing using diffractive three-dimensional mesostructures.

Paper Details

Date Published: 24 November 2003
PDF: 8 pages
Proc. SPIE 5224, Nanomaterials and Their Optical Applications, (24 November 2003); doi: 10.1117/12.509365
Show Author Affiliations
Yun-Ju Lee, Univ. of Illinois/Urbana-Champaign (United States)
Paul V. Braun, Univ. of Illinois/Urbana-Champaign (United States)

Published in SPIE Proceedings Vol. 5224:
Nanomaterials and Their Optical Applications
Guozhong Cao; Younan Xia; Paul V. Braun, Editor(s)

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