title: Label-free and pH-sensitive colorimetric materials for the sensing of urea.
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.
authors: Shaanxi 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.
authors: Lu
authors: L
authors: Li
authors: 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.
authors: Yue
authors: Y
authors: Long
authors: Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Science, Northwest A&F University, Yangling 712100, China.
authors: Jin-Ming
authors: JM
authors: Gao
authors: 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.
authors: Kai
authors: K
authors: Song
authors: Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors: Guoqiang
authors: G
authors: Yang
mesh_terms: D003124:Colorimetry; D006863:Hydrogen-Ion Concentration; D054802:Molecular Imprinting; D017785:Photons; D011108:Polymers / Q000737:chemistry; D014508:Urea / Q000032:analysis*; D014510:Urease / Q000737:chemistry / Q000378:metabolism
chemical_list: D011108:Polymers; D014508:Urea; D014510:Urease