Title: Voltage Tunable Nanoparticles Array
Abstract: It has been established that local electromagnetic field enhancements due to optical excitation at the plasmon resonance increases when the electromagnetic field of individual metals or nanoparticles couple through nanoscale inter-particle spacing. Nanoparticles array made from closely spaced gold nanoparticles have enhanced electromagnetic fields with useful applications in plasmonics, medical diagnosis, optical sensing, electro-voltaic devices and catalysis leading to a worldwide interest in the development of these next-generation materials.
Numerous assembling processes based on electrostatics, hydrogen bonding or biological recognition, among others, have been proposed in the past decade for the manufacture of closely spaced nanoparticles. The initial starting materials and conditions dictate and control the final structure of the clusters. For example, the spacing between neighboring nanoparticles in the array can be fixed by the length of molecular linkers or ligands attached to the nanoparticles’ surface. These techniques generally produce fixed spacing between the nanoparticles. Nevertheless, there are advantages to assembling arrays whose inter-particle spacing can be varied. For example, this would allow the plasmon resonance properties to be tuned or switched on and off.
We have demonstrated the formation and voltage-tunability of a nanoparticle array at the liquid-liquid interface between water and 1,2-dichloroethane .Each element in the array was a single nanoparticle. We characterized the array structure with x-ray reflectivity and grazing-incidence small angle scattering (GISAXS).
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