College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
Talanta. 2020 Aug 15;216:121009. doi: 10.1016/j.talanta.2020.121009. Epub 2020 Apr 10.
As one of the transition metal dichalcogenide, CoSe has received much attention because of its superior physicochemical properties. In this work, a self-templated approach was proposed for constructing CoSe hollow microspheres by utilizing ZIF-67 hollow sphere as a template. In the followed selenylation process, selenium vapor reacts with cobalt ion in ZIF-67 to form CoSe microspheres. The obtained CoSe microspheres retain the cavity of the ZIF-67 and massive uniformly dispersed CoSe nanoparticles are embedded throughout carbon walls. The hollow interior and porous structure of CoSe microspheres provide an enhanced surface-volume ratio and short charge/mass transfer distance. The CoSe microspheres show a typical oxidase-like property able to promote 3,3',5,5'-tetramethylbenzidine (TMB) oxidation by dissolved oxygen to produce an intensive color reaction. Reactive oxygen species trials demonstrate that ·OH, O and O radicals coexist in the TMB-CoSe system. Based on its inhibitive role, a rapid and ultrasensitive determination of glutathione was reached, showing four orders of magnitude linear range from 0.005 to 10 μM and a limit of detection of 4.62 nM (S/N = 3). The assay has been successfully used to glutathione determination in practical samples.
作为过渡金属二硫属化物之一，CoSe 因其优异的物理化学性质而受到广泛关注。在这项工作中，我们提出了一种自模板法，通过利用 ZIF-67 空心球作为模板来构建 CoSe 空心微球。在随后的硒化过程中，硒蒸气与 ZIF-67 中的钴离子反应，形成 CoSe 微球。所得到的 CoSe 微球保留了 ZIF-67 的空腔，并且大量均匀分散的 CoSe 纳米颗粒嵌入到碳壁中。CoSe 微球的空心内部和多孔结构提供了增强的表面积-体积比和短的电荷/质量转移距离。CoSe 微球表现出典型的氧化酶样性质，能够促进溶解氧氧化 3,3',5,5'-四甲基联苯胺（TMB），产生强烈的颜色反应。活性氧物种试验表明，在 TMB-CoSe 体系中存在·OH、O 和 O自由基。基于其抑制作用，实现了对谷胱甘肽的快速和超灵敏测定，其线性范围从 0.005 到 10 μM，检测限为 4.62 nM（S/N = 3）。该测定法已成功用于实际样品中谷胱甘肽的测定。
