Laser ablation synthesis particularly excels in generating bimetallic and multimetallic nanoparticles either from bulk alloy targets or from mixed powders. These particles can be obtained with a stoichiometry and with compositions which can be very difficult to synthesize by chemical methods. Furthermore, we examine the formation of metastable structures, which emerge from the laser ablation process.
![Alloys](/imperia/md/images/chemie/rehbock-group/fittosize__295_259_7ea33b33d2f3c152aa66657963fdc320_alloys.jpg)
Our main research goals and interests are:
- Understanding the formation process of alloy nanoparticles during laser ablation in liquids
- Tuning composition and internal phase structure of alloy nanoparticles by solvent and target composition
- Plasmonic properties of alloy nanoparticles containing noble metals (Ag,Au)
- Application of alloy nanoparticles for bioimaging or as antimicrobial agents
Publications:
[1] Johny, J.; Li, Y.; Kamp, M.; Prymak, O.; Liang, S. X.; Krekeler, T.; Ritter, M.; Kienle, L.; Rehbock, C.; Barcikowski, S.; Reichenberger, S. Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts. Nano Res. (2022), 15, 4807-4819.
[2] Stein, F.; Kohsakowski, S.; Martinez-Hincapie, R.; Reichenberger, S.; Rehbock, C.; Colic, V.; Guay, D.; Barcikowski, S. Disproportional surface segregation in ligand-free gold–silver alloy solid solution nanoparticles, and its implication for catalysis and biomedicine. Faraday Discussions (2022) Advanced Article.
[3] Johny, J.; Prymak, O.; Kamp, M.; Calvo, F.; Kim, S. H.; Tymoczko, A.; El-Zoka, A.; Rehbock, C.; Schurmann, U.; Gault, B.; Kienle, L.; Barcikowski, S. Multidimensional thermally-induced transformation of nest-structured complex Au-Fe nanoalloys towards equilibrium. Nano Research (2022) 15, 581-592.
[4] Johny, J.; Kamp, M.; Prymak, O.; Tymoczko, A.; Wiedwald, U.; Rehbock, C.; Schurmann, U.; Popescu, R.; Gerthsen, D.; Kienle, L.; Shaji, S.; Barcikowski, S. Formation of Co-Au Core-Shell Nanoparticles with Thin Gold Shells and Soft Magnetic epsilon-Cobalt Cores Ruled by Thermodynamics and Kinetics. Journal of Physical Chemistry C (2021) 125, 9534-9549.
[5] Johny, J.; Li, Y.; Kamp, M.; Prymak, O.; Liang, S. X.; Krekeler, T.; Ritter, M.; Kienle, L.; Rehbock, C.; Barcikowski, S.; Reichenberger, S. Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts. Nano Research.
[6] Al-Zubeidi, A.; Stein, F.; Flatebo, C.; Rehbock, C.; Jebeli, S. A. H.; Landes, C. F.; Barcikowski, S.; Link, S. Single-Particle Hyperspectral Imaging Reveals Kinetics of Silver Ion Leaching from Alloy Nanoparticles. ACS Nano (2021) 15, 8363-8375.
[7] Tymoczko, A.; Kamp, M.; Rehbock, C.; Kienle, L.; Cattaruzza, E.; Barcikowski, S.; Amendola, V. One-step synthesis of Fe-Au core-shell magnetic-plasmonic nanoparticles driven by interface energy minimization. Nanoscale Horizons (2019) 4, 1326-1332.
[8] Kamp, M.; Tymoczko, A.; Schurmann, U.; Jakobi, J.; Rehbock, C.; Ratzke, K.; Barcikowski, S.; Kienle, L. Temperature-Dependent Ultrastructure Transformation of Au-Fe Nanoparticles Investigated by in Situ Scanning Transmission Electron Microscopy. Crystal Growth & Design (2018) 18, 5434-5440.
[9] Tymoczko, A.; Kamp, M.; Prymak, O.; Rehbock, C.; Jakobi, J.; Schurmann, U.; Kienle, L.; Barcikowski, S. How the crystal structure and phase segregation of Au-Fe alloy nanoparticles are ruled by the molar fraction and size. Nanoscale (2018) 10, 16434-16437.
[10] O. Prymak, J. Jakobi, C. Rehbock, M. Epple, S. Barcikowski, Crystallographic characterization of laser-generated, polymer-stabilized 4 nm silver-gold alloyed nanoparticles, Materials Chemistry and Physics, 207 (2018) 442-450.
[11] P. Wagener, J. Jakobi, C. Rehbock, V.S.K. Chakravadhanula, C. Thede, U. Wiedwald, M. Bartsch, L. Kienle, S. Barcikowski, Solvent-surface interactions control the phase structure in laser-generated iron-gold core-shell nanoparticles, Scientific Reports, 6 (2016) 12.
[12] U. Taylor, D. Tiedemann, C. Rehbock, W.A. Kues, S. Barcikowski, D. Rath, Influence of gold, silver and gold-silver alloy nanoparticles on germ cell function and embryo development, Beilstein Journal of Nanotechnology, 6 (2015) 651-664.
[13] C. Rehbock, J. Jakobi, L. Gamrad, S. van der Meer, D. Tiedemann, U. Taylor, W. Kues, D. Rath, S. Barcikowski, Current state of laser synthesis of metal and alloy nanoparticles as ligand-free reference materials for nano-toxicological assays, Beilstein Journal of Nanotechnology, 5 (2014) 1523-1541.
[14] A. Neumeister, J. Jakobi, C. Rehbock, J. Moysig, S. Barcikowski, Monophasic ligand-free alloy nanoparticle synthesis determinants during pulsed laser ablation of bulk alloy and consolidated microparticles in water, Physical Chemistry Chemical Physics, 16 (2014) 23671-23678.
[15] D. Tiedemann, U. Taylor, C. Rehbock, J. Jakobi, S. Klein, W.A. Kues, S. Barcikowski, D. Rath, Reprotoxicity of gold, silver, and gold-silver alloy nanoparticles on mammalian gametes, Analyst, 139 (2014) 931-942.
[16] S. Grade, J. Eberhard, J. Jakobi, A. Winkel, M. Stiesch, S. Barcikowski, Alloying colloidal silver nanoparticles with gold disproportionally controls antibacterial and toxic effects, Gold Bulletin, 46 (2013) 3-11.