Rapid fabrication of Au nanoparticle films with the aid of centrifugal force

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Abstract
In this work, rapid fabrication of Au nanoparticle (Au NP) films has been simply achieved by alternate adsorption of citrate-stabilized Au NPs and poly(diallyldimethylammonium chloride) with the aid of centrifugal force. In contrast to conventional electrostatic assembly, we carried out the assembly process in a centrifuge with a rotating speed of 4000 rpm, where centrifugal force can be imposed on Au NPs. Scanning electron microscopy and cyclic voltammetry were employed to characterize the assembly procedure and the thus-prepared thin solid films. Our results demonstrate that centrifugal force can promote the assembly of Au NPs and therefore enable the rapid fabrication of functional Au NP films. The thus-prepared Au NP films can serve as surface enhanced Raman scatting (SERS) substrates with tunable SERS signal intensity. This method is simple, rapid, and can be used as a general method to rapidly assemble other charged nanoparticles.