Pd鈥揑r Core鈥揝hell Nanocubes: A Type of Highly Efficient and Versatile Peroxidase Mimic

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• 作者：Xiaohu Xia ; Jingtuo Zhang ; Ning Lu ; Moon J. Kim ; Kushal Ghale ; Ye Xu ; Erin McKenzie ; Jiabin Liu ; Haihang Ye
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：October 27, 2015
• 年：2015
• 卷：9
• 期：10
• 页码：9994-10004
• 全文大小：697K
• ISSN：1936-086X

文摘

Peroxidase mimics with dimensions on the nanoscale have received great interest as emerging artificial enzymes for biomedicine and environmental protection. While a variety of peroxidase mimics have been actively developed recently, limited progress has been made toward improving their catalytic efficiency. In this study, we report a type of highly efficient peroxidase mimic that was engineered by depositing Ir atoms as ultrathin skins (a few atomic layers) on Pd nanocubes (i.e., Pd鈥揑r cubes). The Pd鈥揑r cubes exhibited significantly enhanced efficiency, with catalytic constants more than 20- and 400-fold higher than those of the initial Pd cubes and horseradish peroxidase (HRP), respectively. As a proof-of-concept demonstration, the Pd鈥揑r cubes were applied to the colorimetric enzyme-linked immunosorbent assay (ELISA) of human prostate surface antigen (PSA) with a detection limit of 0.67 pg/mL, which is 鈭?10-fold lower than that of the conventional HRP-based ELISA using the same set of antibodies and the same procedure.