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Tang, Yinjun; Chen, Yanjun; Wu, Yu; Xu, Weiqing; Luo, Zhen; Ye, Hua-Rong; Gu, Wenling; Song, Weiyu; Guo, Shaojun; Zhu, Chengzhou
Nano letters, 01/2023, Letnik: 23, Številka: 1Journal Article
Great efforts have been made to expand the application fields of nanozymes, which puts forward requirements for nanozymes with both superior catalytic activity and specificity. Herein, we reported the high-indexed intermetallic Pt3Sn (H–Pt3Sn) with high peroxidase-like activity and specificity. The resultant H–Pt3Sn exhibits a specific activity of 345.3 U/mg, which is 1.82 times higher than Pt. Moreover, H–Pt3Sn possesses negligible oxidase-like and catalase-like activities, achieving superior catalytic specificity toward H2O2 activation. Experimental and theoretical calculations reveal both the splitting energy for adsorbed H2O2 and the energy barrier for the rate-determining step of H–Pt3Sn are significantly decreased compared with Pt3Sn and Pt. Finally, a nanozyme-linked immunosorbent assay is successfully developed, achieving the sensitive and accurate colorimetric detection for carcinoembryonic antigen with a low detection limit of 0.49 pg/mL and showing practical feasibility in serum sample detection.
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