School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu, China.
Department of Applied Biology and Chemical Technology, and the State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, 999077, Hong Kong.
Anal Bioanal Chem. 2019 Mar;411(8):1561-1568. doi: 10.1007/s00216-019-01597-5. Epub 2019 Feb 14.
We present a new "off-on" fluorescence probe for detecting hypochlorite (ClO) based on silicon quantum dots coupled with silver nanoparticles (SiQDs/AgNPs) as nanocomplexes. Via introducing N-[3-(trimethoxysilyl)propyl]ethylenediamine and catechol as initial reactants, silicon quantum dots (SiQDs) with excellent properties were synthesized through a simple hydrothermal method. Transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the morphology and structure of quantum dots. The fluorescence of SiQDs could be quenched by the silver nanoparticles (AgNPs) by surface plasmon-enhanced energy transfer (SPEET) from SiQDs (donor) to AgNPs (acceptor). The AgNPs could be etched by adding ClO, thus freeing the SiQDs from the AgNP surfaces and restoring the SiQDs' fluorescence. The sensing system exhibits many advantages, such as wide linear response range, high sensitivity, and excellent selectivity. Under optimized conditions, wide linear ranges (from 0.1 to 100.0 μM) and low detection limits (0.08 μM) were obtained for ClO. Graphical Abstract.
我们提出了一种新的基于硅量子点与银纳米粒子（SiQDs/AgNPs）作为纳米复合物的“关-开”型荧光探针来检测次氯酸根（ClO）。通过引入 N-[3-(三甲氧基硅基)丙基]乙二胺和儿茶酚作为初始反应物，我们通过简单的水热法合成了具有优异性能的硅量子点（SiQDs）。透射电子显微镜、傅里叶变换红外光谱和 X 射线光电子能谱用于表征量子点的形态和结构。银纳米粒子（AgNPs）可以通过表面等离激元增强能量转移（SPEET）从 SiQDs（供体）到 AgNPs（受体）来猝灭 SiQDs 的荧光。加入 ClO 可以蚀刻 AgNPs，从而使 SiQDs 从 AgNP 表面释放出来并恢复 SiQDs 的荧光。该传感系统具有许多优点，例如宽线性响应范围、高灵敏度和优异的选择性。在优化条件下，ClO 的线性范围（0.1-100.0 μM）很宽，检测限（0.08 μM）很低。
J Colloid Interface Sci. 2014-7-15
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