Size-Dependent Vacancy Concentration in Nickel, Copper, Gold, and Platinum Nanoparticles

作者：Gao, Panpan; Ma, Hongxin; Wu, Quan; Qiao, Lijie; Volinsky, Alex A.; Su, Yanjing^*

来源：Journal of Physical Chemistry C, 2016, 120(31): 17613-17619.

DOI：10.1021/acs.jpcc.6b05712

• FORMATION ENERGY
• METALLIC NANOPARTICLES
• SOLUTE CONCENTRATIONS
• SURFACE-CHEMISTRY
• HIGH-TEMPERATURE
• NANOPOROUS GOLD
• COHESIVE ENERGY
• SMALL PARTICLES
• INTERFACE
• NANOCRYSTALS

Size-dependent thermodynamic model is presented to simultaneously analyze stress and vacancy concentration, along with their coupling behavior ill spherical metal nanoparticles. A nanoparticle is treated as a composite with a core lattice and a surface shell, which both have their corresponding thermodynamic properties. Thermodynamic analysis of Ni, Cu, Au, and Pt particles shows: that the vacancy concentration in the core and the surface shell could be significantly decreased for smaller particles. The apparent vacancy concentration in the whole nanoparticle reaches the maximum at the critical particle size of about 100 nm and is lower for larger or smaller particles. This result provides comprehensive understanding of the vacancy concentration in nanomaterials, which had been represented by two opposite views in the past decades.

• 出版日期2016-8-11
• 单位北京科技大学