Two-Dye Core/Shell Zeolite Nanoparticles: A New Tool for Ratiometric pH Measurements

Tristan Doussineau; Monique Smaiehi; Gerhard J. Mohr

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Two-Dye Core/Shell Zeolite Nanoparticles: A New Tool for Ratiometric pH Measurements

机译：双染料核/壳沸石纳米颗粒：用于比率式pH测量的新工具

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The preparation of core/shell nanoparticles that enable ratiometric pH measurement is described. The core of the nanoparticles consists of a zeolite-β matrix that exhibits a 3-hydroxyflavone reference dye within the porous network. Coating an amorphous silica shell containing a fluorosensor around the zeolite through the Stoeber process provides pH sensitivity to the nanoparticles. Morphological characterization (dynamic light scattering, transmission electronic microscopy) demonstrates the control of the sensing silica shell around the zeolite cores, leading to highly monodisperse spherical nanoparticles, while structural characterization (wide-angle X-ray diffraction, nitrogen adsorption) shows the amorphous character of the shell. Spectral characterization via UV/Vis absorption and steady-state fluorescence shows good pH sensitivity of the resulting nanosensors with a pK_a suitable for bioanalytical applications.

机译：描述了能够进行比例式pH测量的核/壳纳米颗粒的制备。纳米颗粒的核心由沸石-β基质组成，该沸石在多孔网络中具有3-羟基黄酮参考染料。通过Stoeber工艺在沸石周围涂覆包含氟传感器的无定形二氧化硅壳，可为纳米颗粒提供pH敏感性。形态表征（动态光散射，透射电子显微镜）证明了对沸石核周围传感硅壳的控制，从而导致了高度单分散的球形纳米颗粒，而结构表征（广角X射线衍射，氮吸附）则显示出无定形特征的外壳。通过UV / Vis吸收和稳态荧光的光谱表征显示，所得到的纳米传感器具有适合生物分析应用的pK_a，具有良好的pH敏感性。

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《Advanced Functional Materials》 |2009年第1期|117-122|共6页
作者
Tristan Doussineau; Monique Smaiehi; Gerhard J. Mohr;
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Institut fuer Physikalische Chemie Friedrich Schiller University of Jena Lessingstrasse 10, 07743 Jena (Germany);

Institut Europeen des Membranes UMR 5635, University of Montpellier 2 1919 Route de Mende, 34293 Montpellier (France);

Institut fuer Physikalische Chemie Friedrich Schiller University of Jena Lessingstrasse 10, 07743 Jena (Germany);

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Two-Dye Core/Shell Zeolite Nanoparticles: A New Tool for Ratiometric pH Measurements

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