Kinetic Rate Constants of Gold Nanoparticle Deposition
on Silicon
Valentina Onesto
Francesco Gentile
Mario Russo
Marco Villani
Patrizio Candeloro
Gerardo Perozziello
Natalia Malara
Enzo Di Fabrizio
M. Laura Coluccio
10.1021/acs.langmuir.9b02074.s001
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.
2019-10-23 16:04:16
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