Preparation and Chemically Responsive Luminescent Switching of the Flexible Self-supporting TbW10-Agarose Green Emission Thin Films

doi:10.15541/jim20180506

Abstract

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 polyoxometalates TbW₁₀ and good film-forming matrix agarose. Composition and structure of the films were characterized by FT-IR and Raman spectrum. Thir thickness, surface roughness and microstructure were studied by SEM, AFM and TEM, respectively. And effects of different TbW₁₀ contents on the transmittance and luminescence properties were investigated. On this basis, the reversible chemically responsive luminescent switching performance of TbW₁₀-Agarose green luminescent 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. And the fluorescence spectrum detection for HCl gas was extended based on the green luminescent thin film sensor with a detection limit of 0.2731 mmol·L ^-1.

Key words: polyoxometalates, stimuli-responsive, luminescent switch, thin film sensor

CLC Number:

O611

WANG Bin, ZHENG Jin-Hui, WANG Xiao-Hong, ZHAO Bo, XU Liang, LIU Zong-Rui. Preparation and Chemically Responsive Luminescent Switching of the Flexible Self-supporting TbW₁₀-Agarose Green Emission Thin Films[J]. Journal of Inorganic Materials, 2019, 34(8): 844-850.

Figures/Tables 10

Fig. 1 XRD patterns of experimental and calculated powder

Fig. 2 Physical photographs of film preparation process

Fig. 3 FT-IR spectra (a) and Raman spectra (b) of the TbW10-Agarose film

Fig. 4 SEM (a) and AFM (b) images of the TbW10-Agarose films, and TEM images of the Agarose (c) and TbW10-Agarose (d) films

Fig. 5 UV-Vis spectra (a) and luminescence spectra (b) of the TbW10-Agarose film

Fig. 6 UV-Vis spectra (a) and luminescence spectra (b) of the TbW10-Agarose films containing different TbW10 contents

Fig. 7 FT-IR spectra (a) and Raman spectra (b) of the TbW10-Agarose film alternately exposed in HCl and NH3 gas

Fig. 8 Luminescence spectra (a), corresponding photographs (b) and luminescent switch illustration (c) of TbW10-Agarose film in different conditions

Fig. 9 Luminescent intensity at 547 nm with time under the stimulation of HCl and NH3 gases

Fig. 10 Luminescent spectra of TbW10-Agarose film with different HCl gas concentration and the inset shows the logarithm of luminescent intensities at 547 nm as a function of HCl gas concentration

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Preparation and Chemically Responsive Luminescent Switching of the Flexible Self-supporting TbW₁₀-Agarose Green Emission Thin Films

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