Ultra-thin particulate films prepared from capped and uncapped reverse-micelle-entrapped silver particles

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Abstract
The formation of thin particulate films from silver nanoparticles, generated by the sodium borohydride reduction of aqueous silver nitrate within aerosol-OT [AOT; sodium bis(2-ethyl-1-hexyl) sulfosuccinate] reverse micelles in 2,2,4-trimethylpentane(isooctane), is described. The silver nanoparticles were dispersed on a water subphase in a Langmuir trough and the structure of the ultra-thin films formed was investigated by using Brewster-angle microscopy (BAM), transmission electron microscopy (TEM) and reflectivity measurements. Silver nanoparticles were also successfully ‘capped’ by octadecanethiol and, after isolation, could be readily redispersed in chloroform. The ultra-thin particulate films of the capped silver nanoparticles were highly uniform and displayed excellent reproducibility, while the films formed from the reverse-micelle solutions were somewhat less reproducible.

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