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Synthesis and Microstructural Investigations of Organometallic Pd(II) Thiol-Gold Nanoparticles Hybrids

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Author(s): Vitale Floriana | Vitaliano Rosa | Battocchio Chiara | Fratoddi Ilaria | Giannini Cinzia | Piscopiello Emanuela | Guagliardi Antonella | Cervellino Antonio | Polzonetti Giovanni | Russo MariaVittoria | Tapfer Leander

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 3;
Issue: 11;
Start page: 461;
Date: 2008;
Original page

Keywords: Gold nanoparticles | Thiol complexes | Organometallic complexes | Nanoparticle synthesis

ABSTRACT
Abstract In this work the synthesis and characterization of gold nanoparticles functionalized by a novel thiol-organometallic complex containing Pd(II) centers is presented. Pd(II) thiol,trans, trans-[dithiolate-dibis(tributylphosphine)dipalladium(II)-4,4′-diethynylbiphenyl] was synthesized and linked to Au nanoparticles by the chemical reduction of a metal salt precursor. The new hybrid made of organometallic Pd(II) thiol-gold nanoparticles, shows through a single S bridge a direct link between Pd(II) and Au nanoparticles. The size-control of the Au nanoparticles (diameter range 2–10 nm) was achieved by choosing the suitable AuCl4 −/thiol molar ratio. The size, strain, shape, and crystalline structure of these functionalized nanoparticles were determined by a full-pattern X-ray powder diffraction analysis, high-resolution TEM, and X-ray photoelectron spectroscopy. Photoluminescence spectroscopy measurements of the hybrid system show emission peaks at 418 and 440 nm. The hybrid was exposed to gaseous NO x with the aim to evaluate the suitability for applications in sensor devices; XPS measurements permitted to ascertain and investigate the hybrid –gas interaction.
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