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    Enhanced Ordering in Gold Nanoparticles Self-Assembly through Excess Free Ligands

    Year: 2011

    Journal: Langmuir, 2011, 27 (7), 3355–3360, 20131009

    Authors: Cindy Y. Lau, Huigao Duan, Fuke Wang, Chao Bin He, Hong Yee Low, Joel K. W. Yang

    Organizations: Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States; Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602

    Self-assembly of nanometer-sized particles is an elegant and economical approach to achieve dense patterns over large areas beyond the resolution and throughput capabilities of electron-beam lithography. In this paper, we present results of self-assembly of oleylamine-capped gold nanoparticles with 8.0 ± 0.3 nm diameter into densely packed and well-ordered monolayers with center-to-center distance of 11 nm. Self-assembly was done in a Langmuir−Blodgett trough and picked up onto Si substrates. The nanoparticles undesirably assembled within micrometer-sized “droplets” that were organic in nature. However, within these droplets, we observed that the addition of the excess ligand, oleylamine, drastically enhanced the self-assembly of the nanoparticles into monolayers with near-perfect ordering. This approach has the potential use in templated self-assembly of nanoparticles for rearranging poorly ordered assembly into a commensurate prepatterned substrate.