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首页> 外文期刊>Journal of porous materials >Study on the preparation of CdTe nanocrystals on the surface of mesoporous silica and evaluation as modifier of carbon paste electrodes
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Study on the preparation of CdTe nanocrystals on the surface of mesoporous silica and evaluation as modifier of carbon paste electrodes

机译：中孔二氧化硅表面CdTe纳米晶体的制备及碳浆电极改性剂的制备

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摘要

Here CdTe nanocrystals were grown onto mesoporous silicas. The influence of the surface areas, volumes and pore diameters of the silica matrices on the spectroscopic properties of CdTe was evaluated. Emission properties of the CdTe were found to depend on the textural properties of silicas. Electrochemical characterization of different electrodes (unmodified carbon paste, and carbon paste modified with the mesoporous silica and with CdTe anchored onto mesoporous silica) evidenced that the presence of CdTe nanocrystals lead to a significant increase of the anodic peak referring to Cu2+ detection. The electrode with optimal characteristics responded to Cu2+ in the linear range from 5.0x10(-8) to 2.3x10(-6) mol L-1 and the calculated limit of detection was 6.4x10(-8) mol L-1. The method developed here proved to be efficient for monitoring Cu2+ in sugar cane spirit (cachaca), with quantitative results comparable to those obtained from Flame Atomic Absorbtion Spectroscopy.
机译：此处CDTE纳米晶体生长在中孔的二氧化硅上。评价了二氧化硅基质的表面积，体积和孔径对CDTE的光谱性能的影响。发现CDTE的排放性能取决于二氧化硅的纹理性质。不同电极的电化学表征（未改性的碳糊和用介孔二氧化硅改性的碳浆料和锚固在中孔二氧化硅上的CdTe）证明了CdTe纳米晶体的存在导致Cu2 +检测的阳极峰的显着增加。具有最佳特性的电极从5.0×10（-8）至2.3×10（-6）mol L-1的线性范围内的Cu2 +响应于Cu2 +，并且计算的检测限为6.4×10（-8）摩尔L-1。此处开发的方法证明是为了监测甘蔗精神（Cachaca）中的Cu2 +，定量结果与来自火焰原子吸收光谱的量相当。

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