Singh Pooja Dharni Dhar, Murthy Z V P, Kailasa Suresh Kumar
Department of Chemistry, Sardar Vallabhbhai National Institute of Technology, Surat, 395007, Gujarat, India.
Department of Chemical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, 395007, Gujarat, India.
Mikrochim Acta. 2024 Feb 27;191(3):161. doi: 10.1007/s00604-024-06247-x.
The exceptional ascending heights of graphene (carbon) and boron nitride nanostructures have invited scientists to explore metal nitride nanomaterials. Herein, ZnN quantum dots (QDs) were prepared via a simple hydrothermal route from the reaction between zinc nitrate hexahydrate and ammonia solution that possess efficient strength towards sensing applications of metal ions (Cu and Mn). The as-prepared ZnN QDs show bright fluorescence, displaying an emission peak at 408 nm upon excitation at 320 nm, with a quantum yield (QY) of 29.56%. It was noticed that the fluorescence intensity of ZnN QDs linearly decreases with the independent addition of Cu and Mn ions, displaying good linearity in the ranges 2.5-50 µM and 0.05-5 µM with detection limits of 21.77 nM and of 63.82 nM for Cu and Mn ions, respectively. The probe was successfully tested for quantifying Cu and Mn in real samples including river, canal, and tap water, providing good recoveries with a relative standard deviation < 2%. Furthermore, the masking proposition can successfully eliminate the interference if the two metal ions exist together. It was found that thiourea is efficiently able to mask Cu and selectively quenches Mn, and L-cysteine is able to halt the quenching potential of Mn and is selectively able to sense Cu. The ZnN QDs provide a simple way for the simultaneous detection of both Cu and Mn ions in environmental samples at low sample preparations requirements.
石墨烯（碳）和氮化硼纳米结构的非凡生长高度促使科学家探索金属氮化物纳米材料。在此，通过六水合硝酸锌与氨溶液之间的简单水热反应制备了ZnN量子点（QDs），其对金属离子（Cu和Mn）的传感应用具有高效性能。所制备的ZnN量子点呈现出明亮的荧光，在320nm激发下于408nm处显示发射峰，量子产率（QY）为29.56%。值得注意的是，ZnN量子点的荧光强度随着Cu和Mn离子的单独添加而线性降低，在2.5 - 50µM和0.05 - 5µM范围内分别对Cu和Mn离子显示出良好的线性关系，检测限分别为21.77nM和63.82nM。该探针已成功用于定量分析包括河水、运河水和自来水在内的实际样品中的Cu和Mn，回收率良好，相对标准偏差<2%。此外，如果两种金属离子同时存在，掩蔽方案能够成功消除干扰。结果发现，硫脲能够有效掩蔽Cu并选择性猝灭Mn，而L - 半胱氨酸能够抑制Mn的猝灭电位并选择性地传感Cu。ZnN量子点为在低样品制备要求下同时检测环境样品中的Cu和Mn离子提供了一种简单方法。
