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

Nano Research 2017年第6期10卷 2056-2069页

作者： Shuangfei Cai Xinghang Jia qiusen han Xiyun Yan Rong Yang Chen Wang CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology University of Chinese Academy of Sciences 8eijing 100190 China Key Laboratory of Protein and Peptide Pharmaceutical National Laboratory of Biomacromolecules Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China

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-Pt-a-gs0 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.

关键词： platinum porous oxygen reduction reaction enzyme mimic antibacterial

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A novel strategy to construct supported Pd nano-composites with synergistically enhanced catalytic performances

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Nano Research 2018年第6期11卷 3272-3281页

作者： Shuangfei Cai Xueliang Liu qiusen han Cui Qi Rong Yang Chen Wang CAS Key Lab for Biomedical Effects of Nanomaterials and Nanosafety CAS center for Excellence in Nanoscience National Center for Nanoscience and Technology University of Chinese Academy of Sciences Beijing 100190 China Sino-Danish College University of Chinese Academy of Sciences Beijing 100190 China

We report a facile protocol for the one-pot preparation of monodisperse Pd nanoparticles （NPs） supported on ultrathin NiCl2 nanosheets （NSs）. The effective protocol can be described as in situ reduction-oxidation-assembly to create Pd/NiCl2 nanocomposites and is applicable for the development of stable yet highly active Pd-based heterogeneous catalysts for organic transformations. The Pd/NiCl2 composite displayed synergistically enhanced catalytic activity, high stability, and good recyclability for the tested model oxidation reaction. The in situ nucleation and growth of NiCl2 NS around Pd NPs guaranteed a clean metal-support interface and greatly facilitated the catalytic reaction. This work provides a novel synthesis method for supported Pd nanocomposites suitable for many important applications.

关键词： Pd nanocomposites one-pot synthesis activity stability

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MoS2-Pt3Au1 Nanocomposites with Enhanced Peroxidase-Like Activities for Selective Colorimetric Detection of Phenol

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Chinese Journal of Chemistry 2017年第5期35卷 605-612页

作者： Shuangfei Cai qiusen han Cui Qi Xinhuan Wang Tian Wang Xinghang Jia Rong Yang Chen Wang CAS center for Excellence in Nanoscience National Center for Nanoscience and Technology University of Chinese Academy of Sciences Beijing 100190 China

MoS2-based nanocomposites are emerging as novel versatile ***,uniform Pt3Au1 nanoparticles （NPs） decorated few-layer MoS2 nanosheets were fabricated as novel enzyme *** to pure MoS2 nanosheets,the as-prepared MoS2-Pt3Au1 nanocomposites displayed enhanced peroxidase-like *** nanocomposites also possessed well dispersibility and high stability in *** these findings,a simple,fast and low-cost colorimetric detection of phenol with high sensitivity and selectivity is developed,which is based on oxidative coupling reaction of phenol and 4-aminoantipyine in the presence of H2O2 as an oxidant to form pink color *** work provides a type of MoS2-NP composites as enzyme mimics for many potential applications in catalysis.

关键词： MoS2 nanosheets enzyme mimic colorimetric detection phenol

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