Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, UK.
Phys Chem Chem Phys. 2019 Feb 20;21(8):4444-4451. doi: 10.1039/c9cp00056a.
We report the key role of the capping agent in the detection of metal cations using tannic acid (TA) capped gold nanoparticles at both ensembles (using cyclic voltammetry) and with individual particles (using oxidative and reductive nanoimpacts). The results show that the capping agent complexes with Zn2+ and Hg2+ in a reversible and Langmuirian manner in both cases. The sensitivity of detection is determined by the amount of capping agent present on the nanoparticles with similar values seen for both oxidation and reduction reactions. The optimisation of the capping agent loading is therefore key to metal ion detection.
我们报告了封端剂在使用单宁酸（TA）封端金纳米粒子进行金属阳离子检测中的关键作用，包括在集合体（使用循环伏安法）和单个粒子（使用氧化和还原纳米冲击）中的作用。结果表明，在这两种情况下，封端剂都以可逆和朗缪尔方式与 Zn2+和 Hg2+ 络合。检测灵敏度取决于纳米粒子上存在的封端剂的量，氧化和还原反应的灵敏度相似。因此，封端剂负载的优化是金属离子检测的关键。
