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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 3
BKCSDE 29(3)
March 20, 2008 

Packing Density Parameters of Palladium Nanoparticle Monolayers Fabricated via Spin-Coating Electrostatic Self-Assembly
Minshi An, Jong-Dal Hong*, Kyung-Sang Cho, Eun-Sung Lee, Jae-Young Choi
Pd nanoparticle, Monolayer, Packing density, Spin-coating electrostatic self-assembly
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.
623 - 626
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