Solution and surfactant-free growth of supported high index facet SERS active nanoparticles of rhenium by phase demixing

Valenzuela, Carlos Díaz; Valenzuela, María Luisa; Caceres, S.; O'Dwyer, Colm

Solution and surfactant-free growth of supported high index facet SERS active nanoparticles of rhenium by phase demixing

Files

Re_paper_RSC.pdf(4.45 MB)

Accepted version

Date

2012-11-21

Authors

Valenzuela, Carlos Díaz

Valenzuela, María Luisa

Caceres, S.

O'Dwyer, Colm

Publisher

Royal Society of Chemistry (RSC)

Published Version

10.1039/C2TA00262K

Abstract

Stable, high-index facet Re nanoparticles have been grown by a solid state synthetic method, negating the need for solutions or surfactants to control seeding, supracrystallization and NP shape. By using mixtures of K[ReO4] and the cyclic triphosphazene [NP(O2C12H8)]3, high-index facet nanoparticles and nanocrystals [similar]3 nm in size can be seeded and grown from drop-cast films and powders due to phase demixing of the metallopolymer. NP dispersions are formed directly within a carbon support that liquefies, allowing NP coarsening and ripening, and the eventual formation of a solidified graphitic support filled with crystals. Successful growth of mesoscale supracrystals of Re also occurs from ripening of nucleated NP seeds, incubated within a solidified and partially dewetted solid support that patterns the surface. The supported Re NP dispersions also exhibit surface enhanced Raman scattering within a graphitic matrix.

Keywords

Nanoparticles , Dispersions , Raman spectroscopy , Surface scattering , High-index facets , Nanoparticles and nanocrystals , Re nanoparticles , Solid supports , Supra crystals , Surface enhanced , Raman Scattering (SERS) , Surfactant-free , Synthetic methods

Citation

Valenzuela, C. D., Valenzuela, M. L., Caceres, S. and O'Dwyer, C. (2013) 'Solution and surfactant-free growth of supported high index facet SERS active nanoparticles of rhenium by phase demixing', Journal of Materials Chemistry A, 1(5), pp. 1566-1572.