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Recently, Gao Linhui, a researcher of the Institute of Advanced Technology of the Chinese Academy of Sciences Shenzhen Institute of Advanced Technology, instructed Master Xie Xiaobin and others to successfully synthesize a multi-heterostructure noble metal nano-alloy with special morphology. The relevant results were published online at Advanced Materials. Site-Selective Trimetallic Heterogeneous Nanostructures for Enhanced Electrocatalytic Performance.
The research team has conducted in-depth studies on the controllable synthesis of precious metal nanoparticles, such as the preparation of high-index crystal cubic concave-grain nanopalladium in one step. The nanoparticles contain high-density step atoms and kink atoms, and thus show more Superior high catalytic activity and long cycle stability. The relevant research was published in the journal Nature Science (Scientific Reports, 2015, 5, doi:10.1038/srep08515). Based on the study of the preparation mechanism and properties of noble metal nanomaterials, the design and synthesis of trimetal isomers were developed to increase their catalytic activity and stability.
It is well known that the unique properties and excellent properties of precious metal nanomaterials are closely related to their topography composition and internal structure. The three-component noble metal nanomaterials with complex structure not only have the characteristics of nano-particles, but also have electronic coupling and lattice strain effects caused by the internal structure, and regulate the morphology structure of the three-component noble metal nano-materials, and it is expected to achieve its performance. The control further realizes the multifunctionality of nanomaterials. In addition, the selection of suitable surfactants to effectively control the anisotropic growth of crystals is the key to the preparation of nanomaterials with different morphologies and sizes. At present, the mechanism of action of different surfactants is not yet fully determined, and charged surface stabilizers will generally Complexes with metal salt precursors affect the reduction kinetics. The use of cetyltrimethylammonium bromide (CTAB) in this study not only acts as a stabilizer to prevent the aggregation of nanocrystallites, but also has a strong adsorption on specific metal facets to regulate the morphology growth of the crystals.
Three tri-metal Au/Ag/Pt hetero-nanostructures (AAPHNs) are competitively grown on the top grain boundary of the polycrystalline Ag/Au core-shell nano-octahedron to form multiple Catalytic active site. The nanocrystalline structure has various structures and various crystal phases. Through precise design, the surface of the active center is enriched during the crystal growth stage, and the catalytic performance and long-term performance are improved. Nanomaterials contain a large number of highly active Pt step and corner atoms and highly active crystal planes. They also possess adjustable electronic coupling effects between Au and Ag core-shell octahedrons and the top Pt. And the common influence of the physical effects of different components makes this material show good catalytic activity in the catalytic methanol oxidation reaction.
Based on the structural design and preparation process upgrade of precious metal nanocrystals, this research is expected to develop synthesis routes for different noble metal alloy heterostructures and more active crystal planes and sites, and to use the interface confinement effect of multiple heterogeneous metal nano-alloys. Expands its role in catalysis, Localized Surface Plasmon Resonance (LSPR), enhanced Raman scattering, and its visual and near-infrared-adjustable optical properties make it useful in bioimaging, tumor photothermal The therapeutic field shows its application value.
The project research and achievements were independently completed by Shenzhen Advanced Institute. The project was supported by the National Natural Science Foundation of China (21401211), the Guangdong Provincial Low-Cost Health Innovation Team, the Shenzhen Advanced Institute Outstanding Youth Innovation Fund (201309), and the Shenzhen Branch Commission for Innovation (JCYJ20130401170306832).
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