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首页> 外文期刊>Journal of Sol-Gel Science and Technology >Fluorescent nanocrystals grown in sol-gel thin films for generic stable and sensitive sensors
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Fluorescent nanocrystals grown in sol-gel thin films for generic stable and sensitive sensors

机译：溶胶-凝胶薄膜中生长的荧光纳米晶体，用于通用的稳定和敏感传感器

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摘要

Through the sol-gel route, we have well-controlled the preparation of fluorescent organic nanocrystals grown in silicate thin films. This process is based on the confined nucleation and growth of dyes in the pores of wet gels. The resulting nanocomposite sol-gel thin films, coated onto low-cost substrates, exhibit coupled properties: transparency, stability, easy shaping of sol-gel thin films and high fluorescence intensity coming from organic nanocrystals. The sensitivity of the fluorescence intensity of nanocrystals to their environments can be exploited for the development of optical sensors. Indeed, Forster Resonance Energy Transfer can inhibit nanocrystal fluorescence when probe molecules are adsorbed or grafted on the nanocrystal surface after their diffusion through the pores of the sol-gel matrix. We investigated by time-resolved fluorescence spectroscopy the effect of nanocrystal size and probe concentration on the fluorescence quenching in presence of Methylene Blue used in this study as molecular probe. As strong fluorescence quenchings can be achieved, even for low probe concentrations, these hybrid organic-inorganic nanocoposites are promising for the development of sensor devices by increasing their fluorescence contrasts under specific chemical or biological environments.
机译：通过溶胶-凝胶路线，我们已经很好地控制了在硅酸盐薄膜中生长的荧光有机纳米晶体的制备。该过程基于染料在湿凝胶孔中的局限性成核和生长。涂覆在低成本基材上的所得纳米复合溶胶-凝胶薄膜具有耦合的特性：透明，稳定，溶胶-凝胶薄膜易于成型以及来自有机纳米晶体的高荧光强度。纳米晶体的荧光强度对其环境的敏感性可以用于光学传感器的开发。实际上，当探针分子通过溶胶-凝胶基质的孔扩散后吸附或接枝到纳米晶体表面时，福斯特共振能量转移可以抑制纳米晶体荧光。我们通过时间分辨荧光光谱法研究了在本研究中用作分子探针的亚甲基蓝存在下，纳米晶体尺寸和探针浓度对荧光猝灭的影响。由于即使对于低探针浓度也可以实现强荧光猝灭，因此这些杂化有机-无机纳米复合材料有望通过在特定化学或生物环境下增加荧光对比来开发传感器设备。

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