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Cold Welding of au nanostructures at Room Temperature

Transactions of Nanjing University of Aeronautics and Astronautics 2021年第3期38卷 492-500页

作者： XU Haiying NI Yuan MIAO Changzong KAN Caixia SHI Daning College of Science Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China Department of Mathematics and Physics Nanjing Institute of TechnologyNanjing 211167P.R.China Department of Mathematics and Physics Jinling Institute of TechnologyNanjing 211169P.R.China

The common au nanostructures(nanospheres,nanorods and nanosheets)were prepared by the seed growth method to explore the cold welding phenomenon of these non-single crystal nanostructures at room *** studies show that the concentration of surfactant cetyltrimethylammonium bromide(CTAB)and drying conditions are important factors to determine the evolution and final configuration of nanostructures during *** key factor of cold welding is the concentration of surfactant as low as 0.3 mm/L,and the welding should be carried out under the condition of slow evaporation and sufficient relaxation time,rather than rapid drying *** the same time,the structural evolution during the welding process of gold rod head and tail is simulated by combining the electronic microscope characterization and density functional theory,which reveals that the stability of the welding nanostructure is better than that of the dispersed *** the slow evaporation process of au nanostructures with the same crystal structure,the low surfactant attached to the surface of the nanoparticles increases the attraction between the nanoparticles,which makes the nanoparticles close to each other adhere due to the interaction,and improves the physical properties of the intersection due to the diffusion,epitaxy and surface relaxation of the metal surface *** results provide a research basis for the physical property analysis of nanostructures and the construction of defect devices.

关键词： cold welding au nanostructures oriented-attachment room temperature density function theory

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Engineering versatile au-based catalysts for solar-to-fuel conversion

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Journal of Energy Chemistry 2023年第8期83卷 341-362,I0010页

作者： Chunhua Wang Hongwen Zhang Feili Lai Zhirun Xie Yun Hau Ng Bo Weng Xuejiao Wu Yuhe Liao Department of Chemistry KU LeuvenCelestijinenlaan 200F3001 LeuvenBelgium cMACS Department of Microbial and Molecular SystemsKU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium School of Energy and Environment City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong 999077China Centre for Sustainable Catalysis and Engineering Faculty of Bioscience EngineeringKU Leuven3001 LeuvenBelgium Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640GuangdongChina

Gold(au) nanostructures(NSs) have been widely employed as cocatalysts to improve the photoactivity of semiconductor materials, while a systematic summary of the engineering approaches of au NSs to maximize the solar-to-fuel conversion efficiency is still lacking. In this review, the recently developed strategies for elevating the overall photocatalytic performance of au-based catalysts and the deep physical chemistry mechanisms are highlighted. Firstly, the synthetic approaches of au NSs are summarized, followed by an elaboration on their multiple functions in improving photoactivity. Afterward, modification strategies of au NSs used to enhance the photocatalytic efficiency of au-semiconductor composites,including controlling the au NSs morphology, size, crystal phase, defect engineering, alloying with different metals, modulating interfacial interaction, and introducing an external field, are summarized and discussed independently. Additionally, advanced characterization techniques that can provide insights into the charge dynamics of the photocatalysts are introduced. Finally, we share our opinion on the challenges and outline potentially promising opportunities and directions for efficient au-based photocatalysis research moving forward. We sincerely look forward to this review can deliver insightful views to design efficient au-based photocatalysts and spur certain innovations to other metal-based catalysts.

关键词： au nanostructures Modification strategies Semiconductor Photocatalysis Solar-to-fuel conversion

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