Engineering Nano-aggregates: β-Cyclodextrin Facilitates the Thiol-Gold Nanoparticle Self-Assembly

Exploring nanoparticle porosity using nano-impacts: platinum nanoparticle aggregates.

The porosity of platinum nanoparticles (PtNPs) is explored for the first time using tag-redox coulometry (TRC). This is achieved by monitoring the reduction of the 4-nitrobenzenethiol (NTP)-tagged PtNPs on carbon electrodes via both immobilisation and nanoimpacts. The average charge per impact is measured and attributed to the reduction of NTP adsorbed on individual PtNPs. The number of NTP mol...

Light-assisted, templated self-assembly of gold nanoparticle chains.

We experimentally demonstrate the technique of light-assisted, templated self-assembly (LATS) to trap and assemble 200 nm diameter gold nanoparticles. We excite a guided-resonance mode of a photonic-crystal slab with 1.55 μm laser light to create an array of optical traps. Unlike our previous demonstration of LATS with polystyrene particles, we find that the interparticle interactions play a si...

Gold nanoparticle self-assembly moderated by a cholesteric liquid crystal

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Colloidal gold nanoparticle formation derived from self-assembled supramolecular structure of cyclodextrin/Au salt complex.

We present a novel procedure for the formation of colloidal gold nanoparticles (AuNPs) derived from the supramolecular self-assembled structure of a cyclodextrin (CD)/Au salt complex (SCA) without the necessity for additional reducing or stabilizing agents. The SCA served as a solid template for the formation of gold seeds by solid-state thermal treatment within the confining environment of the...

Gold Nanoparticle Super Assembly by Dielectrophoresis

Dielectrophoretic assembly of nanoparticles has great utility in creating intricate designer nanoscale structures. Dielectrophoresis of gold nanoparticles has been used to create nanowires for electronics, high surface area electrodes for sensors, and nanoelectrode nanogaps for molecular electronics. Despite the utility of this technique, little is known about the mechanisms governing different...

Investigation of thiol derivatized gold nanoparticle sensors for gas analysis