Two-Dye Core/Shell Zeolite Nanoparticles: A New Tool for Ratiometric pH Measurements
Two-Dye Core/Shell Zeolite Nanoparticles: A New Tool for Ratiometric pH Measurements
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DOI：
10.1002/adfm.200800718
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发表时间：
2009-01-09
影响因子：
19
通讯作者：
Mohr, Gerhard J.
中科院分区：
文献类型：
--
作者：
Doussineau, Tristan;Smaihi, Monique;Mohr, Gerhard J.
描述了核/壳纳米粒子的制备，使比值pH测量。纳米颗粒的核心由偶氮石- β基质组成，在多孔网络中表现出3-羟基黄酮参考染料。通过Stober工艺在沸石周围涂覆含有氟传感器的无定形二氧化硅外壳，可提供对纳米颗粒的pH灵敏度。形态学表征（动态光散射透射电镜）表明，沸石芯周围的传感二氧化硅壳受到控制，形成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）表明，壳具有非晶态特征。通过紫外/可见吸收和稳态荧光的光谱表征表明，所得到的纳米传感器具有良好的pH敏感性，其pK(a)适合生物分析应用。
The preparation of core/shell nanoparticles that enable ratiometric pH measurement is described. The core of the nanoparticles consists of azeolite-beta 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 Stober 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.