Facile aqueous synthesis of ZnCuInS/ZnS–ZnS QDs with enhanced photoluminescence lifetime for selective detection of Cu(ii) ions

IF 3.8 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Nande Mgedle, O. Aladesuyi, T. C. Lebepe, Vuyelwa Ncapayi, O. Oluwafemi
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引用次数: 0

Abstract

Abstract Quaternary quantum dots (QDs) have recently gained more attention due to their low toxicity, tunable wavelength, reduced or no blueshift emission upon overcoating, improved photoluminescence (PL) quantum yield, and PL lifetime when compared to their binary (II–VI) and ternary (I–III–VI) counterparts. In this work, the aqueous synthesis of ZnCuInS/ZnS–ZnS multi-shell quaternary QDs as a nanosensor for the selective detection of Cu2+ ions was reported. The as-synthesized QDs were spherical, with a particle diameter of 3.66 ± 0.81 nm, and emitted in the first near-infrared window (725 nm) with an average decay PL lifetime of 43.69 ns. The X-ray diffraction analysis showed that the QDs were of the wurtzite structure, while the Fourier transform infrared spectroscopy confirmed GSH capping through the sulphur–metal bond. Furthermore, the fluorometric study shows that the developed multi-shell QDs were selective towards Cu2+ ions compared to other metal ions via fluorescence quenching with a limit of detection of 1.4 µM, which is below the acceptable limit in drinking water.
选择性检测Cu(ii)离子的ZnCuInS/ ZnS-ZnS量子点的水溶合成
与二元(II-VI)和三元(I-III-VI)相比,第四元量子点(QDs)由于其低毒性、可调谐波长、覆盖后减少或没有蓝移发射、提高光致发光(PL)量子产率和PL寿命而受到越来越多的关注。本文报道了水中合成ZnCuInS/ ZnS-ZnS多壳层四元量子点作为选择性检测Cu2+离子的纳米传感器。合成的量子点为球形,粒径为3.66±0.81 nm,发射于第一个近红外窗口(725 nm),平均衰减PL寿命为43.69 ns。x射线衍射分析表明量子点为纤锌矿结构,傅里叶变换红外光谱通过硫-金属键确认GSH封盖。此外,荧光学研究表明,与其他金属离子相比,所开发的多壳量子点通过荧光猝灭对Cu2+离子具有选择性,检测限为1.4µM,低于饮用水的可接受限。
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来源期刊
Green Processing and Synthesis
Green Processing and Synthesis CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
6.70
自引率
9.30%
发文量
78
审稿时长
7 weeks
期刊介绍: Green Processing and Synthesis is a bimonthly, peer-reviewed journal that provides up-to-date research both on fundamental as well as applied aspects of innovative green process development and chemical synthesis, giving an appropriate share to industrial views. The contributions are cutting edge, high-impact, authoritative, and provide both pros and cons of potential technologies. Green Processing and Synthesis provides a platform for scientists and engineers, especially chemists and chemical engineers, but is also open for interdisciplinary research from other areas such as physics, materials science, or catalysis.
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