It was found, that the addition of ions during laser-based synthesis of noble metal nanoparticles (laser ablation, laser fragmentation and laser melting) can be used to tune the colloidal stability as well as the particle size distribution of the resulting colloidal particles. In this context, particularly the in situ additions of chaotropic (soft) anions at low salinities in the micromolar concentration regime worked most efficiently during ablation.
Our main research goals and interests are:
- Understanding the influence of salts on the nanoparticle formation process
- Specific ion effects (Hofmeister series)
- Evaluation and tuning of colloidal stability and particle size
- Synergies between ion and pH effects
Publications:
[1] Ziefuss, A. R.; Haxhiaj, I.; Muller, S.; Gharib, M.; Gridina, O.; Rehbock, C.; Chakraborty, I.; Peng, B. X.; Muhler, M.; Parak, W. J.; Barcikowski, S.; Reichenberger, S. Origin of Laser-Induced Colloidal Gold Surface Oxidation and Charge Density, and Its Role in Oxidation Catalysis. Journal of Physical Chemistry C (2020), 124, 20981-20990
[2] Ziefuss, A. R.; Barcikowski, S.; Rehbock, C. Synergism between Specific Halide Anions and pH Effects during Nanosecond Laser Fragmentation of Ligand-Free Gold Nanoparticles. Langmuir (2019), 35, 6630-6639.
[3] C. Pfeiffer, C. Rehbock, D. Huhn, C. Carrillo-Carrion, D.J. de Aberasturi, V. Merk, S. Barcikowski, W.J. Parak, Interaction of colloidal nanoparticles with their local environment: the (ionic) nanoenvironment around nanoparticles is different from bulk and determines the physico-chemical properties of the nanoparticles, Journal of the Royal Society Interface, 11 (2014).
[4] C. Rehbock, J. Zwartscholten, S. Barcikowski, Biocompatible Gold Submicrometer Spheres with Variable Surface Texture Fabricated by Pulsed Laser Melting in Liquid, Chem. Lett., 43 (2014) 1502-1504.
[5] V. Merk, C. Rehbock, F. Becker, U. Hagemann, H. Nienhaus, S. Barcikowski, In Situ Non-DLVO Stabilization of Surfactant-Free, Plasmonic Gold Nanoparticles: Effect of Hofmeister's Anions, Langmuir, 30 (2014) 4213-4222.
[6] C. Rehbock, V. Merk, L. Gamrad, R. Streubel, S. Barcikowski, Size control of laser-fabricated surfactant-free gold nanoparticles with highly diluted electrolytes and their subsequent bioconjugation, Physical Chemistry Chemical Physics, 15 (2013) 3057-3067.
