Preparation and Chemically Responsive Luminescent Switching of the Flexible Self-supporting TbW10-Agarose Green-emission Thin Films
(2.School of Chemistry & Environment Engineering, Changchun University of Science and Technology, Changchun, China 130022)
【Abstract】Flexible self-supporting TbW10-Agarose composite thin films were prepared by combination of sol-gel and casting technique based on the functional complementarity between excellent green luminescence polyoxometalate TbW10 and good film-forming matrix agarose. Composition and structure of the films were characterized by FT-IR and Raman spectra. Their thickness, surface roughness and microstructure were studied by SEM, AFM and TEM, respectively. The effects of TbW10 content on the transmittance and luminescence properties were investigated. On this basis, the reversible chemically responsive luminescent switching performance of TbW10-Agarose green-emission thin film was realized under stimulation of HCl and NH3. The response time and reversibility of chemically responsive luminescent switching performance were studied by fluorescence kinetics curves. The fluorescence spectrum detection for HCl gas was achieved based on the green-emission thin film sensor with a detection limit of 0.273 1 mmol·L–1.
【Keywords】 polyoxometalates; stimuli-responsive; luminescent switch; thin film sensor;
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