Optical nanosensor design with uniform pore geometry and large particle morphology.
Optical nanosensor design with uniform pore geometry and large particle morphology.
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DOI：
10.1002/chem.200700499
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发表时间：
2007-11
期刊：
影响因子：
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通讯作者：
S. El‐Safty;A. Ismail;H. Matsunaga;F. Mizukami
中科院分区：
文献类型：
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作者：
S. El‐Safty;A. Ismail;H. Matsunaga;F. Mizukami
为了实现对环境中有毒重金属离子的净化，需要设计合适的光学选择性、灵敏传感系统的纳米传感器。具有二维或三维（2D或3D）几何形状和大颗粒形态的介观结构材料显示出作为探针载体的希望，因此可以用于可重复地制造均匀包装的纳米传感器。这是第一篇关于介观结构载体的重要关键特性（如形态、几何形状和孔形状）对光学纳米传感器设计功能影响的报告。这种介观结构传感器具有优越的物理特性，可以作为传感系统的元件，具有优异的稳定性和灵敏度，并且具有快速的检测响应。纳米传感器的设计即使在低浓度的污染物目标离子（纳摩尔水平）下也能提高选择性。在这里开发的纳米传感器中，高度有序的3D单体（HOM）的大孔表面颗粒表现出对邻苯三酚红探针的高吸附能力和对分析物离子运输的高可及性，从而可以在低至10(-9)mol dm（-3）的浓度和0.5 ppb至3 ppm的宽检测范围内裸眼检测Sb（III）离子。我们研究的一个关键发现是，尽管探针官能团的电子受体/供体强度在几次再生/重复使用循环后略有下降，但我们的介观结构纳米传感器设计保留了高效的灵敏度，而没有显著增加运动障碍。结果表明，光学纳米传感器的大规模可逆性在金属离子传感系统中是可行的。
Appropriate design of nanosensors for optically selective, sensitive sensing systems is needed for naked-eye detection of pollutants for environmental cleanup of toxic heavy-metal ions. Mesostructured materials with two- or three-dimensional (2D or 3D) geometries and large particle morphologies show promise as probe carriers, and can therefore be used to reproducibly fabricate uniformly packed nanosensors. This is the first report on the effects of significant key properties of the mesostructured carriers, such as morphology, geometry, and pore shape, on the functionality of optical nanosensor designs. Such mesostructured sensors with superior physical characteristics can be used as components in sensing systems with excellent stability and sensitivity, and with rapid detection response. The nanosensor design can enhance the selectivity even at low concentrations of the pollutant target ions (nanomolar level). Among the nanosensors developed here, the large pore-surface grains of highly ordered 3D monoliths (HOM) exhibited a high adsorption capability of the Pyrogallol Red probe and high accessibility to analyte ion transport, leading to possible naked-eye detection of Sb(III) ions at concentrations as low as 10(-9) mol dm(-3) and at a wide detection range of 0.5 ppb to 3 ppm. A key finding in our study was that our mesostructured nanosensor designs retained highly efficient sensitivity without a significant increase in kinetic hindrance, despite the slight decrease of the specific activity of the electron acceptor/donor strength of the probe functional group after several regeneration/reuse cycles. The results, in general, indicate that large-scale reversibility of optical nanosensors is feasible in such metal-ion sensing systems.