Open Access Nano Express

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

Floriana Vitale12, Rosa Vitaliano2, Chiara Battocchio3, Ilaria Fratoddi2*, Cinzia Giannini4, Emanuela Piscopiello1, Antonella Guagliardi4, Antonio Cervellino5, Giovanni Polzonetti3, MariaVittoria Russo2 and Leander Tapfer1

Author affiliations

1 Department of Advanced Physics Technology & New Materials (FIM), Brindisi Research Center, ENEA, S.S. Appia, km.713, Brindisi, 72100, Italy

2 Department of Chemistry, University of Roma “La Sapienza”, P.le A.Moro, Roma, 5 - 00185, Italy

3 Department of Physics, INSTM and CISDiC Unit, University “Roma Tre”, Via della Vasca Navale, Rome, 84 - 00146, Italy

4 Institute of Crystallography, CNR, via Amendola 122/O, Bari, 70126, Italy

5 Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, Villigen PSI, CH-5232, Switzerland

For all author emails, please log on.

Citation and License

Nanoscale Research Letters 2008, 3:461-467  doi:10.1007/s11671-008-9181-x

Published: 10 October 2008

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 NOxwith the aim to evaluate the suitability for applications in sensor devices; XPS measurements permitted to ascertain and investigate the hybrid –gas interaction.

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