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.
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机译：旋涂静电自组装（SCESA）用于在带相反电荷的表面上制备单层羧酸涂层的Pd纳米颗粒（NP）（D？5 nm）。关于各种参数，包括在颗粒的浓度，pH和溶液的离子强度方面，检查了在旋转的固体基底上形成的NP单层的堆积密度（3000rpm）。最初，堆积密度随着颗粒浓度的增加呈指数增长，最高达到1.2 wt％（最大值8.4）10 11 / cm 2 。还发现，随着pH的降低和溶液离子强度的增加，堆积密度也急剧增加。这些趋势可归因于溶液中和底物上NP之间颗粒间排斥的减少。这项研究的最佳结果是在pH值为8的1.2 wt％溶液中获得的。在这些条件下，获得了密度最高的NP单层（即1.6} 10 12 / cm 2 ）。
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