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Updated: Mar 26, 2026

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Published on: September 17, 2016
Label-free and pH-sensitive colorimetric materials for the sensing of urea
Lu Li1, Yue Long2, Jin-Ming Gao3
1Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Science, Northwest A&F University, Yangling 712100, China and Laboratory of Bio-Inspired Smart Interface Sciences, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China. songkai@mail.ipc.ac.cn.
Abstract:
This communication demonstrates a facile method for naked-eye detection of urea based on the structure color change of pH-sensitive photonic crystals. The insertion of urease provides excellent selectivity over other molecules. The detection of urea in different concentration ranges could be realized by changing the molar ratio between the functional monomer and cross-linker.
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