Breath-Figure Approach to Preparing Inverse Opal Gold Nanocrystal Films

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Breath figures formed on a liquid substrate on contact with humid air can serve as templates for mesoporous structures. When the growth of the water droplets is controlled, the resulting pores will have narrow size dispersion and periodic arrays. When water droplets are formed on liquid solution of gold nanocrystals (Au NCs), the final solid product can be Au NC film with periodic arrays of holes. The periodicity is a key requirement for applications such as waveguide. En route to fabrication of 2-dimensional inverse opals with high periodicity, we investigate morphological changes of the resulting Au NC film while changing various parameters, such as size of the Au NCs, the capping ligand, the dispersion concentration, the solvent, and the relative humidity. In this study, we specifically aim to identify the changes derived from the Au NC size differences because the degree of the film formation (E) can be stabilized as the crystal size (R_NC) increases according to the relevant equation, E=πR_NC^2 γ_cw (1-|cosθ_cw | )^2. In addition, we examine morphology of the film at different parts of a substrate to see how the Marangoni convection influences the hole formation. Finally, we study the effect of capping ligands on Au NCs on long-range periodicity on the holey Au NC films by preparing NCs with 2 types of capping ligands: alkylthiol (e.g., 1-dodecanethiol) or fluorinated thiol (e.g., fluorooctyl methacrylate-thiol).
Publisher
한국화학공학회
Issue Date
2012-10-26
Language
KOR
Citation

2012년 한국화학공학회 가을학술대회, pp.336 - 336

URI
http://hdl.handle.net/10203/173217
Appears in Collection
CBE-Conference Papers(학술회의논문)
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