Polymer-template-assisted growth of gold nanowires using a novel flow-stream technique.
By utilizing a fluidic device, a gold nanoparticle dispersion is cast onto a nanostructured polymer template using solution subjected to hydrodynamic flow. With in situ grazing incidence small-angle X-ray scattering (GISAXS), the progressive gold deposition from a stream of gold solution onto the polymer template of a diblock copolymer with parallel cylinder morphology arranged into powder-like domains is investigated. The continuously flowing solution causes a systematic increase in the X-ray contrast between both of the microphase-separated blocks of the block copolymer film, indicating flow-induced selective gold immobilization on one block. Both in situ GISAXS data and atomic force microscopy of the metal-deposited polymer film prove the 1D coalescence of nanoparticles into continuous nanowires. With additional gold nanoparticle upload by the continuous flow-stream method, the selectivity of the nanoparticle deposition diminishes as a result of the formation of a pseudo uniform gold layer. Consequently, this flow-stream deposition technique introduces an easy alternative method to the vapor deposition technique for surface gold nanopatterning.
Metwalli
E
E
TU München, Physik Department LS E13, James-Franck-Strasse 1, 85747 Garching, Germany.
Moulin
J-F
JF
Perlich
J
J
Wang
W
W
Diethert
A
A
Roth
S V
SV
Müller-Buschbaum
P
P
D000327:Adsorption; D006046:Gold / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D053838:Scattering, Small Angle; D014961:X-Ray Diffraction
D011108:Polymers; D006046:Gold