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Patterned self-assembly of gold nanoparticles on chemical templates fabricated by soft UV nanoimprint lithography

Article appeared in: Nanotechnology 22 (2011) 295301 (7pp); doi:10.1088/0957-4484/22/29/295301

S. Gilles, C. Kaulen, M. Pabst, U. Simon, A. Offenhäusser, and D. Mayer 


Published: September 2011

Nanoparticles guided by surface bound Charges Nanoparticles guided by surface bound Charges Left: schematic representation of electrostatic interaction between an amino modified area (positive charges) and citrate stabilized gold nanoparticles (negative charges). (2x2) µm SEM image of rectangular (right, 1D) template structures decorated with low density of gold nanoparticles.

Abstract:

Chemical templates for the patterned immobilization of gold nanoparticles were fabricated by soft UV nanoimprint lithography. These chemical templates were successfully used for the self-assembly of citrate stabilized gold nanoparticles based on electrostatic template – particle interactions. By reducing the ionic strength of the solution, one- and zero-dimensional particle assemblies were generated on sub-100-nm template structures. In this way, we found a rather simple method for the fabrication of high resolution gold nanoparticle assemblies, by combining a bottom-up and a top-down approach. The nanoparticle assemblies may represent precursor structures for local chemical surface modifications, for instance by exchanging the ligands of the gold nanoparticles.


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