Size dependent active effect of CdTe quantum dots on pyrogallol-H2O2 chemiluminescence system for chromium(III) detection
Size dependent active effect of CdTe quantum dots on pyrogallol-H2O2 chemiluminescence system for chromium(III) detection
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DOI：
10.1007/s00604-010-0334-0
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发表时间：
2010-03
影响因子：
5.7
通讯作者：
S. Kanwal;Xiaohong Fu;X. Su
中科院分区：
文献类型：
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作者：
S. Kanwal;Xiaohong Fu;X. Su
采用微波辐射法制备了巯基丁二酸封端的不同尺寸的水溶性CdTe量子点。量子点能显著增强邻苯三酚-H2O2体系的化学发光。直径为3.8 nm的那些产生最强的CL。获得了紫外-可见光谱、光致发光光谱和化学发光光谱，以探索这种效应。结果表明，Cr（III）离子在20~30 μ M范围内对化学发光有增强作用，可用于痕量Cr（III）的测定，检出限（3 σ）为6pM，相对标准偏差（n = 11）为1.7%。建立了连续流动注射化学发光法测定自来水和湖水中痕量铬的方法。
Water-soluble CdTe quantum-dots (QDs) of different sizes and capped with mercaptosuccinic acid were prepared by the microwave irradiation method. The QDs can significantly enhance the chemiluminescence (CL) of the pyrogallol-H2O2system. Those with a diameter of 3.8 nm produce the most intense CL. UV-vis, photoluminescence, and CL spectra were acquired in order to explore the effect. The results showed that the chromium(III) ion in the concentration range from 20 pM to 30 µM enhances CL, and this is exploited for its trace determination.The limit of detection (3σ) is 6 pM, with a relative standard deviation (n= 11) of 1.7%. A continuous flow injection CL method was developed and applied to the determination of chromium(III) in tap water and lake water samples with satisfactory results.