10.1021/acs.langmuir.9b02074.s001 Valentina Onesto Valentina Onesto Francesco Gentile Francesco Gentile Mario Russo Mario Russo Marco Villani Marco Villani Patrizio Candeloro Patrizio Candeloro Gerardo Perozziello Gerardo Perozziello Natalia Malara Natalia Malara Enzo Di Fabrizio Enzo Di Fabrizio M. Laura Coluccio M. Laura Coluccio Kinetic Rate Constants of Gold Nanoparticle Deposition on Silicon American Chemical Society 2019 UV spectrometer data Scanning electron microscope hydrofluoric acid solution DLA Gold Nanoparticle Deposition Kinetic Rate Constants SEM UV spectrometer analysis nanoporous silicon microparticles gold nanoparticles concentration electroless deposition drug delivery systems 2019-10-23 16:04:16 Journal contribution https://acs.figshare.com/articles/journal_contribution/Kinetic_Rate_Constants_of_Gold_Nanoparticle_Deposition_on_Silicon/10029533 We fabricated gold nanoparticles on nanoporous silicon microparticles using electroless deposition in a hydrofluoric acid solution containing gold chloride. The reaction was followed by UV spectrometer analysis of the absorbance of the solution (proportional to the nanoparticle concentration) for two temperatures (20 and 50 °C). The results indicate that the process is autocatalytic, described by a pseudo-first-order reaction, the apparent rate constant <i>k</i><sub>obs</sub> of which was determined by utilizing UV spectrometer data. We found that the reaction rate constant at 20 °C is 7 × 10<sup>–3</sup> s<sup>–1</sup> and that at 50 °C is 2.9 × 10<sup>–2</sup> s<sup>–1</sup>. Scanning electron microscope (SEM) analysis of samples and diffusion-limited aggregation (DLA) simulations were used to validate the results. This study aims to resolve the kinetics of the electroless deposition of gold on silicon at the nanoscale, in the present state of art missing a quantitative characterization, for certain conditions of growth and given values of temperature and concentration of the reagents. Results may have applications to the synthesis of gold nanoparticles and their use as nanosensors, drug delivery systems, or metal nanometa­materials with advanced optical properties.