Packing Density Parameters of Palladium Nanoparticle Monolayers Fabricated via Spin-Coating Electrostatic Self-Assembly

Bulletin of the Korean chemical society

Kyung-Sang Cho¹  Jae-Young Choi¹  Jong-Dal Hong¹  Eun-Sung Lee¹  Minshi An¹ 

关键词: Pd nanoparticle;    Monolayer;    Packing density;    Spin-coating electrostatic self-assembly;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Spin-coating electrostatic self-assembly (SCESA) is utilized to fabricate a single layer of carboxylic-acidcoated Pd nanoparticles (NPs) (D ? 5 nm) on an oppositely charged surface. The packing density of a NP monolayer formed on a rotating solid substrate (3000 rpm) was examined with regards to various parameters, including the particle concentration, the pH, and the ionic strength of the solution. Initially, the packing density grew exponentially with increases in the particle concentration, up to a maximum value (of 8.4 �? 10¹¹/cm²) at 1.2 wt%. The packing density was also found to increase drastically as the pH decreased and the ionic strength of the solution increased; these trends can be attributed to a reduction in the interparticle repulsions among the NPs in the solution and on the substrate. The best result of this study was achieved in a 1.2 wt% solution at pH 8; under these conditions, an NP monolayer with the highest density (namely, 1.6 �? 10¹²/cm²) was obtained.

【 授权许可】

Unknown