期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 15, 页码 4234-4242出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc00242h
关键词
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资金
- Fundamental Research Funds for the Central Universities [201564001]
- NSFC [51172218, 51372234, 21301187]
- China Postdoctoral Science Foundation [2015M582132, 2016T90652]
- Qingdao Science and Technology Plan [15-9-1-60-jch]
Responsive photonic hydrogels functionalized with crown ether molecules containing the smallest cavities are designed for the detection of the smallest metal ion - beryllium ion (Be2+) - in seawater systems through the exploitation of the volume induced structural color change of non-close packed colloidal photonic crystals (CPCs), which are immobilized in the hydrogels. A new two-step versatile polymerization process has been developed to fabricate these intelligent hydrogel sensing materials. The CPCs in suspension are firstly embedded within a polyvinyl alcohol (PVA) hydrogel scaffold by a cryotropic gelation process, and then the ion-recognition functional groups are covalently bonded to an additional polyacrylamide hydrogel over the PVA via a photochemical reaction. After the removal of the PVA scaffold, the remaining hydrogel exhibits a vivid structural color on account of the diffraction of the photonic crystals in the visible spectral range, while the grafted benzo-9-crown-3 can strongly and selectively chelate with Be2+ ions in solution. The hydrogel sensor enables the detection of Be2+ ions quantitatively and achieves a detection of limit of 10(-11) M in seawater. Through this design and fabrication method, a simple and low-cost sensor for the in situ monitoring of toxic ions or compounds in seawater has been demonstrated.
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