标题：Intrinsic peroxidase-like activity of Cu2ZnSn(SxSe1-x)(4) nanocrystals, and their application to the colorimetric detection of H2O2
作者：Ju, Peng; Ding, Jinfeng; Wang, Bing; Li, Wen; Jiang, Fenghua; Han, Xiuxun; Sun, Chengjun; Wu, Chi
作者机构：[Ju, Peng; Wu, Chi] Shandong Univ, Inst Marine Sci & Technol, 72 Binhai Rd, Qingdao 266237, Peoples R China.; [Ju, Peng; Ding, Jinfeng; Wang, Bing; 更多
通讯作者：Wu, C;Sun, CJ;Sun, CJ
通讯作者地址：[Wu, C]Shandong Univ, Inst Marine Sci & Technol, 72 Binhai Rd, Qingdao 266237, Peoples R China;[Sun, CJ]SOA, Inst Oceanog 1, Marine Ecol Ctr, Key Lab 更多
关键词：Nanomaterials; Peroxidase mimetic; Catalytic activity; Optical; determination; Sensor; Kinetics; XRD; TEM; TMB; Hydrogen peroxide
摘要：Nanocrystals (NCs) of type Cu2ZnSn(SxSe1-x)(4) (CZTSSe) were prepared via a solvothermal approach. They are shown to be highly efficient peroxidase (POx) mimics for colorimetric detection of H2O2. By varying the molar ratio of S and Se during preparation, the NCs showed different crystal structures, morphologies, surface properties, and POx-like activities. Among them, the type CZTSSe-0.25 NCs exhibit the strongest POx-like activities towards the catalytic oxidation of 3,3,5,5-tetramethylbenzidine in the presence of H2O2 to generate a blue product. The enhanced activity is attributed to its more negative potential and larger specific surface of the NCs. Based on these findings, a rapid and ultrasensitive method was developed for the visual and colorimetric determination of H2O2. The method is selective, and the NCs are reusable and long-term stable. The detection limit of H2O2 is 50nM. Kinetic and active species trapping experiments were performed to elucidate the POx-like mechanism of the NCs.