Meng Leixia, Wu Qianqian, Wang Jinlong, Zhang Yu, Zhou Bingxin, Shi Jianjun, Xiao Ke
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454000, People's Republic of China.
Anqiu Ecological Environment Monitoring Center, Anqiu Branch of Weifang Ecological Environment Bureau, Weifang, 261000, People's Republic of China.
Mikrochim Acta. 2025 May 26;192(6):373. doi: 10.1007/s00604-025-07180-3.
An indirect Z-scheme heterostructure of TiO nanoparticles (NPs)/Au/3D tremella-like ZnInS as a photoelectrochemical (PEC) substrate was utilized to construct a highly sensitive and selective PEC sensor for the detection of Hg(II) by combining an ion exchange reaction-mediated signal amplification strategy. After assembling TiO NPs, Au NPs, and 3D tremella-like ZnInS step by step on the indium tin oxide (ITO) electrode, the indirect Z-scheme heterostructure was built, in which ZnInS works as Hg(II)-recognition probe. Importantly, this heterostructure could effectively restrict the rapid recombination of photoinduced carriers to generate an enhanced initial photocurrent for upgrading the sensitivity. With the introduction of Hg(II), the selective Zn-to-Hg ion exchange reaction was activated, and it could in situ form HgS, leading to the quenching of the PEC signal. The designed PEC device presented good performance for Hg(II) assay, with a broad linear range from 0.0005 to 10,000 nM and a detection limit of 0.32 pM. Thus, this protocol is expected to be utilized for elevating food supervision and environmental assessment via Hg(II) determination.
通过结合离子交换反应介导的信号放大策略，利用TiO纳米颗粒（NPs）/Au/3D银耳状ZnInS的间接Z型异质结构作为光电化学（PEC）基底，构建了一种用于检测Hg(II)的高灵敏度和选择性PEC传感器。在铟锡氧化物（ITO）电极上逐步组装TiO NPs、Au NPs和3D银耳状ZnInS后，构建了间接Z型异质结构，其中ZnInS作为Hg(II)识别探针。重要的是，这种异质结构可以有效地限制光生载流子的快速复合，以产生增强的初始光电流来提高灵敏度。随着Hg(II)的引入，选择性的Zn-Hg离子交换反应被激活，并且它可以原位形成HgS，导致PEC信号猝灭。所设计的PEC装置对Hg(II)检测表现出良好的性能，线性范围宽，从0.0005到10,000 nM，检测限为0.32 pM。因此，该方案有望通过Hg(II)测定用于加强食品监管和环境评估。
