中文摘要：本研究利用水溶性半胱胺包被的ZnS量子点（QDs）设计了一种可用于检测致癌物物质黄曲霉毒素的光电探测器。ZnS QDs 是利用沉淀法由聚乙烯醇基质培养合成的。并利用X射线衍射法（XRD）、傅里叶变换红外光谱学（FT-IR）和透射电子显微镜（SEM）法分析了制备的QDs。该方法的检测限是0.05ppb，这远远低于国际上最低的食品污染容许量。
外文摘要：Water-soluble cysteamine-capped ZnS quantum dots (QDs) are designed to serve as a photodetector for a dangerous group of carcinogens called aflatoxins. ZnS QDs are synthesized by growth in a poly(vinyl alcohol) matrix using the precipitation method. The prepared QDs are characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Our characterization shows that these ZnS QDs have a 1.77 nm crystalline size, cubic zinc blende structure and spherical morphology with a diameter less than 10 nm. Photoluminescence spectroscopy (PL) is performed in the presence of a standard solution of aflatoxins (B1, B2, G1 and G2 with a ratio of 5:1:5:1) at various concentrations, in order to determine the efficacy of a ZnS QD-based aflatoxin detection method. Two PL emission peaks located at 440 nm and 467 nm are observed whose intensities are enhanced by increasing the concentration of total aflatoxin. PL variations in the range of aflatoxin concentrations studied here (2.4 ppb–48 ppb) are best described by a Langmuir-type equation. The limit of detection is calculated to be 0.05 ppb, well below the lowest international contamination allowance in food products.
外文关键词：ZnS QDs;Aflatoxin;Cysteamine;Photoluminescence;Synthesis
作者：Yaraki, Mohammad Tavakkoli; Tayebi, Mahnoush; Ahmadieh, Mahnaz; Tahriri,Mohammadreza; Vashaee, Daryoosh; Tayebi, Lobat
作者单位：Amirkabir Univ Technol, USA.
期刊名称：JOURNAL OF ALLOYS AND COMPOUNDS
期刊影响因子：3.014
出版年份：2017
出版刊次：1
点击下载：用于量化黄曲霉毒素的半胱胺包被的ZnS量子点的合成和光学性能