Mono- and bi-functional arenethiols as surfactants for gold nanoparticles: synthesis and characterization
1 ENEA (Italian National Agency for New Technologies, Energy and the Sustainable Economic Development), UTTMATB (Technical Unit of Materials Technologies - Brindisi), Brindisi Research Centre, S.S. 7 Appia km. 706, 72100 Brindisi, Italy
2 Dept. of Chemistry, University of Rome "La Sapienza", P.le A. Moro n. 5, 00185 Roma, Italy
3 Dept. of Physics, INFM, INSTM and CISDiC Unit, University "Roma Tre", Via della Vasca Navale n. 84, 00146 Roma, Italy
4 Istituto di Cristallografia (IC), CNR, via Amendola 122/O, 70126 Bari, Italy
Nanoscale Research Letters 2011, 6:103 doi:10.1186/1556-276X-6-103Published: 27 January 2011
Stable gold nanoparticles stabilized by different mono and bi-functional arenethiols, namely, benzylthiol and 1,4-benzenedimethanethiol, have been prepared by using a modified Brust's two-phase synthesis. The size, shape, and crystalline structure of the gold nanoparticles have been determined by high-resolution electron microscopy and full-pattern X-ray powder diffraction analyses. Nanocrystals diameters have been tuned in the range 2 ÷ 9 nm by a proper variation of Au/S molar ratio. The chemical composition of gold nanoparticles and their interaction with thiols have been investigated by X-ray photoelectron spectroscopy. In particular, the formation of networks has been observed with interconnected gold nanoparticles containing 1,4-benzenedimethanethiol as ligand.