| Effect of surfactant concentration and aggregation on the growth kinetics of nickel nanoparticles | |
| Abstract ID | 5 |
| Presenter | Bridget Ingham |
| Presentation Type | Poster |
| Full Author List | Bridget Ingham, Alec P. LaGrow, Michael F. Toney and Richard D. Tilley |
| Affiliations | Callaghan Innovation Research Ltd. |
| Category | |
| Abstract | The effect of trioctylphosphine (TOP) concentration on the growth of nickel nanoparticles during solution synthesis was studied using in situ synchrotron small-angle X-ray scattering (SAXS). The particle size distribution, total volume of particles, and aggregation behaviour were extracted and followed as a function of time. Increasing the TOP concentration results in smaller nanoparticles being formed. Aggregation occurs once there is a critical concentration of particles above a certain size. This leads to a broadening of the particle size distribution at later times, as particles on the outside of the aggregates continue to grow, while interior particles cease growing when the nickel precursor is locally depleted. The volume-versus-time plots were fitted using a two-step autocatalytic growth model, giving insight into the particle growth mechanism and the role of TOP as a nucleation and/or diffusion limiting agent. |
| Footnotes | |
| Funding Acknowledgement | |