论文部分内容阅读
汞的灵敏选择性检测对于人类的公共安全至关重要.本文成功制备了单层二硫化钼修饰的Cu_7S_4-Au纳米结构(Cu_7S_4-Au@S-MoS_2),通过阳极溶出伏安法实现了对汞的灵敏选择性分析检测.基于超小(<10 nm)单层MoS_2丰富的活性位点及金对汞的良好亲和性,该方法灵敏度高(检出限为190nmol L~(-1))、选择性好(常见Cd~(2+)、Pb~(2+)、Cu~(2+)等均无干扰),并成功用于实际样品中汞的灵敏分析.研究发现Cu_7S_4-Au与Cu_7S_4@S-MoS_2对Hg(Ⅱ)(1.0μmolL~(-1))无响应,而多层MoS_2修饰的Cu_7S_4-Au(Cu_7S_4-Au@M-MoS_2)对Hg(Ⅱ)(1.0μmol L~(-1))有弱响应,结果表明超小单层MoS_2丰富的活性位点及金对汞的良好亲和性对分析检测起到了协同催化作用.
The sensitive and selective detection of mercury is of great importance to the public safety of human beings.In this paper, a single layer of molybdenum disulfide modified Cu_7S_4-Au nanostructures (Cu_7S_4-Au @ S-MoS_2) was successfully prepared by anodic stripping voltammetry Sensitive Selective Detection of Mercury Based on the abundant active sites of MoS2 with very small size (<10 nm) and the good affinity of gold for mercury, this method has high sensitivity (the detection limit is 190 nmol L ~ (-1) ), Good selectivity (common Cd 2+, Pb 2+, Cu 2+, etc.), and successfully used in the sensitive analysis of mercury in real samples.It is found that Cu_7S_4-Au And Cu_7S_4 @ S-MoS_2 did not respond to Hg (Ⅱ) (1.0μmolL -1), while the effect of Cu_7S_4-Au (Cu_7S_4-Au @ M-MoS_2) ~ (-1)). The results showed that the abundant active sites of ultra-small monolayer MoS_2 and the good affinity of gold for mercury played a synergistic catalytic role in the analysis and detection.