Robust Organometallic Gold Nanoparticles
journal contributionposted on 2014-01-27, 00:00 authored by Samuel A. Orefuwa, Mahsa Ravanbakhsh, Sabine N. Neal, Julie B. King, Ahmed A. Mohamed
Robust gold–carbon nanoparticles were synthesized by the sodium borohydride reduction of the diazonium tetrachloroaurate(III) complex [C8F17-4-C6H4NN]AuCl4. FT-IR, 1H NMR, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS) of the ruby red gold nanoparticles indicated the absence of the diazonium nitrogen and the presence of the organic shell C8F17-4-C6H4. Temperature-dependent X-ray powder diffraction (TD-XRD) measurements showed intense cubic gold nanoparticle diffraction patterns in the temperature range 300–500 °C. The effective hydrodynamic size measured by a nanoparticle track analyzer (NTA) in ethanol is 45 nm, and the average core size estimated by transmission electron microscopy (TEM) is 3.2 ± 0.2 nm. The core–shell bonding is strong and is able to withstand prolonged sonication in ethanol and acetonitrile and indefinite exposure to ambient conditions in the solid state.