Synthesis and Microstructural Investigations of Organometallic Pd(II) Thiol-Gold Nanoparticles Hybrids
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
Nanoscale Research Letters 2008, 3:461-467 doi:10.1007/s11671-008-9181-xPublished: 10 October 2008
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.