Abstract
Nanoparticles composed of multiple silver cores and a plasma polymer shell (multicore@shell) were prepared in a single step with a gas aggregation cluster source operating with Ar/hexamethyldisiloxane mixtures and optionally oxygen. The size distribution of the metal inclusions as well as the chemical composition and the thickness of the shells were found to be controlled by the composition of the working gas mixture. Shell matrices ranging from organosilicon plasma polymer to nearly stoichiometric SiO2 were obtained. The method allows facile fabrication of multicore@shell nanoparticles with tailored functional properties, as demonstrated here with the optical response.
Highlights
Production of metal nanoparticles (NP) by gas aggregation sources (GAS) that utilize magnetron sputtering and buffer-gas condensation has become a fast-growing field in nanoscience[1,2,3,4,5]
We present a method for the production of metal core@plasma polymer shell NPs that combines buffer-gas induced condensation of magnetron-sputtered silver and plasma-enhanced chemical vapor deposition (PECVD) of hexamethyldisiloxane (HMDSO)
Plasma polymerization of organic precursors often leads to the formation of nano- and micro-scale particles in the gas phase
Summary
Production of metal nanoparticles (NP) by gas aggregation sources (GAS) that utilize magnetron sputtering and buffer-gas condensation has become a fast-growing field in nanoscience[1,2,3,4,5]. By adjusting the parameters of the discharge, the partial pressure of metal vapors can be deliberately increased above the target surface to create the conditions of supersaturation Such far-from-equilibrium conditions can be further enhanced by using a cool buffer gas which may trigger spontaneous condensation of metal vapors and the formation of NPs. Typically, a buffer gas flow is created in the aggregation zone to transport NPs away from the magnetron and deposit them onto solid supports. These, usually need multiple production steps and typically suffer from the use of toxic precursors, the elimination of the residuals of which represents a substantial challenge From this viewpoint, gas phase methods of fabrication of composite NPs may prove advantageous albeit they have been studied much less[25]. We present a method for the production of metal core@plasma polymer shell NPs that combines buffer-gas induced condensation of magnetron-sputtered silver and plasma-enhanced chemical vapor deposition (PECVD) of hexamethyldisiloxane (HMDSO).
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