title: Solvent induced formation of an ordered nanorod array of gold/polymer composite by block copolymer film templating.
abstract: We report a novel method to fabricate ordered arrays of gold-polymer composite nanorods with the orientation in the vertical direction using block copolymer (BCP) film. The salt precursor is selectively infiltrated within vertically aligned cylindrical domains of the BCP film by immersing the template in a simple aqueous solution of HAuCl(4). Scanning electron microscopy suggests that the salt might be uniformly positioned along the polymeric cylinders. A subsequent vacuum ultraviolet light irradiation simultaneously reduces the HAuCl(4) into spherical gold nanoparticles with mean diameter around 2 nm and removes the matrix of the BCP template to produce metal-polymer composite nanorods. While the solvent is methanol, the salt might be concentrated at the bottom of the BCP film. As a result, a periodic pattern of gold nanoparticles with average diameter around 11 nm is formed where the BCP film is completely etched away. The solvent can effectively tune the spatial distribution of the salt precursor along the polymeric cylinders, which is responsible for the different morphologies of the photochemically fabricated nanostructures.
authors.affiliation: State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Microelectronics and Solid-state Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zou
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Wang
authors.forename: Aijun
authors.initials: A
authors.lastname: Zhou
authors.forename: Jingze
authors.initials: J
authors.lastname: Li
authors.forename: Aimin
authors.initials: A
authors.lastname: Chang
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Motonori
authors.initials: M
authors.lastname: Komura
authors.forename: Kaori
authors.initials: K
authors.lastname: Ito
authors.forename: Tomokazu
authors.initials: T
authors.lastname: Iyoda