title: Two-dimensional colloidal crystal assisted formation of conductive porous gold films with flexible structural controllability.
abstract: Two-dimensional (2D) colloidal crystals of polystyrene (PS) particles were used as a structure-controlling template to fabricate conductive Au films with an ordered array of nanoholes. The fabrication mainly involved the functionalization of the supporting substrate with polyelectrolyte (PE) functional layers, self-assembly of Au nanoparticles, and electroless deposition of gold. The self-assembly of Au nanoparticles and electroless deposition of gold were macroscopically monitored using ultraviolet-visible (UV-vis) spectroscopy based on the changes in both the extinction spectra of Au nanoparticles and the optical responses of ordered arrays of PS particles. By scanning electron microscopy (SEM) characterization, it was found that Au nanoparticles were assembled into a film structure with orderly dispersed nanoholes and the deposition of gold was confined to the preformed Au nanoparticle films. During the formation of Au films, PE layer structure, Au nanoparticle size and heating treatment applied to the PS template could influence the structures of conductive porous Au films such as the hole diameter, film thickness, and hole diameter/wall thickness ratio (D/W). In addition, this paper also described electrochemical cyclic voltammetry (CV) employed to demonstrate the porosity of the ultimate Au films.
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China.
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China.
authors.forename: Chen
authors.initials: C
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, PR China. Electronic address: hyhan@mail.hzau.edu.cn.
authors.forename: Heyou
authors.initials: H
authors.lastname: Han
mesh_terms: D003102:Colloids; D003460:Crystallization; D006046:Gold / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D015394:Molecular Structure; D013056:Spectrophotometry, Ultraviolet
chemical_list: D003102:Colloids; D006046:Gold
keywords: Au nanoparticle; Electroless deposition; Layer by layer assembly; Polyelectrolyte; Polystyrene colloid particle; Two-dimensional colloidal crystal; Two-dimensional conductive porous Au film