Ru(II) Bipyridyl Complex and TiO2 Nanocomposite Based Biomolecule-free Photoelectrochemical Sensor for Highly Selective Determination of Ultra-trace Hg2 in Aqueous Systems
Ru(II) Bipyridyl Complex and TiO2 Nanocomposite Based Biomolecule-free Photoelectrochemical Sensor for Highly Selective Determination of Ultra-trace Hg2 in Aqueous Systems
复制标题
基于 Ru(II) 联吡啶配合物和 TiO2 纳米复合材料的无生物分子光电化学传感器，用于高选择性测定水系统中的超痕量 Hg2
DOI：
10.1007/s40242-019-8392-z
复制
发表时间：
2019
影响因子：
3.1
通讯作者：
Zhao Yanqiu
中科院分区：
文献类型：
--
作者：
Wu Shuo;Yang Xinlan;Zhao Yanqiu
A biomolecule-free photoelectrochemical(PEC) probe(denoted as Ru-1) was designed, synthesized and coupled with TiO2nanoparticles(NPs) for the highly sensitive and selective PEC detection of Hg2+, a model analyte with hypertoxicity to both human health and ecosystem. The probe Ru-1 was designed with Ru(II) bipyridyl complex as the chromophore, thiocyanate ligand as the recognition unit, and carboxylate group as the linkage site to connect Ru-1 to TiO2nanoparticles. Under irradiation, Ru-1 shows strong affinity to TiO2and good photophysical properties of strong visible light absorption, slow electron-hole(e-h+) recombination, and fast photoelectron injection to TiO2nanoparticlesviatheπ-bridge of 4-(2,2′-bipyridin)-4-yl-thiophene moiety. However, the specific coordination of Hg2+with Ru-1viathe thiol moiety in the thiocyanate enlarges the band gap of the complex and reduces the photocurrent significantly. The synergistic interaction between TiO2nanoparticles and the Ru-1 complex led to a selective PEC sensing strategy for Hg2+detection. Detectable linear ranges from 10−12g/mL to 10−7g/mL and from 10−7g/mL to 10−3g/mL were obtained without the interference from possibly co-existed metal ions. The good analytical performances indicate the chemical probe based biomolecule-free PEC platform may offer a new route for the detection of biologically and environmentally important small molecules.
