title: Nanoplasmonic modification of the local morphology, shape, and wetting properties of nanoflake microparticles.
abstract: Inducing a phase transition of a self-organized object may trigger its structural transformation. Here, we demonstrate local control of the morphology and shape of self-organized microparticles with a nanoflake outer surface by nanoplasmonic heating. To increase the photothermal efficiency of the microparticles, gold nanoparticles (AuNPs) or single-walled carbon nanotubes (SWCNTs) were incorporated. AuNPs and SWCNTs, which have excellent photothermal activity, acts as photoresponsive heat converters. Because they have distinct absorption characteristics, visible or near-infrared lasers can be used to induce local heating. The photothermal effect was used to spatially confine the melting to the space within the particle and the aggregate; as a result, microparticles with various shapes and morphologies have been fabricated. Such morphological changes lead to a superhydrophobic-hydrophobic wetting transition, which was confirmed by the films constituting the microparticles. The work presented is seen useful for anisotropic particle synthesis, local wetting control, lithography, and morphological control of functional materials.
authors.affiliation: Department of Interfaces, Max Planck Institute of Colloids and Interfaces, Potsdam 14424, Germany.
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Asanuma
authors.forename: Prabal
authors.initials: P
authors.lastname: Subedi
authors.forename: Jürgen
authors.initials: J
authors.lastname: Hartmann
authors.forename: Yanfei
authors.initials: Y
authors.lastname: Shen
authors.forename: Helmuth
authors.initials: H
authors.lastname: Möhwald
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakanishi
authors.forename: Andre
authors.initials: A
authors.lastname: Skirtach
mesh_terms: D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures; D037742:Nanotubes, Carbon; D017155:Wettability
chemical_list: D037742:Nanotubes, Carbon