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合成了高质量的半胱氨酸修饰Zn0.15Cd0.85S量子点复合材料.利用Cu2+对量子点荧光的猝灭作用,实现了Cu2+的定量检测.所合成的Zn0.15Cd0.85S量子点对其他常见的金属离子几乎没有响应,表明该方法具有较好的选择性.在优化条件下,Zn0.15Cd0.85S量子点荧光的猝灭程度与Cu2+浓度呈良好的线性关系,线性范围为6.0nM～1.0μM,检出限为1.0nM.对0.5μM标准溶液平行测定11次,相对标准偏差为2.0%.利用标准加入法对水样中Cu2+含量进行了测定,结果令人满意.
High-quality cysteine-modified Zn0.15Cd0.85S quantum dot composites were synthesized.The quantitative detection of Cu2 + was achieved by the quenching effect of Cu2 + on quantum dot fluorescence.The synthesized Zn0.15Cd0.85S QD The common metal ions showed almost no response, indicating that this method has good selectivity.Under the optimal conditions, the quenching degree of Zn0.15Cd0.85S quantum dots fluorescence has a good linear relationship with Cu2 + concentration, the linear range of 6.0nM ~ 1.0μM, the detection limit was 1.0nM.The standard deviation of 0.5μM standard solution was 11 and the relative standard deviation was 2.0% .The content of Cu2 + in water sample was determined by standard addition method, and the results were satisfactory.