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Research Article

Porous Pt/Ag nanoparticles with excellent multifunctional enzyme mimic activities and antibacterial effects

Shuangfei Cai1Xinghang Jia1Qiusen Han1Xiyun Yan2Rong Yang1( )Chen Wang1( )
CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyUniversity of Chinese Academy of SciencesBeijing100190China
Key Laboratory of Protein and Peptide PharmaceuticalNational Laboratory of BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing100101China
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Abstract

Enhancing the activity of Pt-based nanocatalysts is of great significance yet a challenge for the oxygen reduction reaction (ORR). In this work, a series of porous Pt/Ag nanoparticles (NPs) were fabricated from regular PtxAg100–x (x = 25, 50, 75) octahedra by a facile and economical dealloying process. Remarkable enhancement in multiple enzyme-mimic activities related to ORR was observed for the dealloyed Pt50Ag50 (D-Pt50Ag50) NPs. This effect can be attributed to the resulting Pt-rich surface structure, increased surface area, and a synergistic effect of Pt and Ag atoms in the D-Pt50Ag50 NPs. Furthermore, the D-Pt50Ag50 NPs exerted excellent antibacterial effects on two model bacteria (gram-negative Escherichia coli and gram-positive Staphylococcus aureus). The present work represents a significant advance in the exploration of the relation between controllable synthesis of high-quality nanoalloys and their novel catalytic properties for various promising applications, including catalysts, biosensors, and biomedicine.

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Nano Research
Pages 2056-2069
Cite this article:
Cai S, Jia X, Han Q, et al. Porous Pt/Ag nanoparticles with excellent multifunctional enzyme mimic activities and antibacterial effects. Nano Research, 2017, 10(6): 2056-2069. https://doi.org/10.1007/s12274-016-1395-0

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Received: 30 September 2016
Revised: 24 November 2016
Accepted: 28 November 2016
Published: 21 January 2017
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016
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