Synthesis of tailored nanoparticles for supported oxidation catalysts
In this study, Au@Pd core@shell nanoparticles were synthesized by a two-step seeded growth method. The effects of different synthesis parameters, including temperature and Au/Pd molar ratio, on the size of Au@Pd core@shell nanoparticles were investigated. The morphology of the as-prepared Au@Pd and Au@Pd/ -Al2O3 core@shell nanoparticles was imaged by high resolution transmission electron microscopy (HRTEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF - STEM). It is shown that Au@Pd core@shell nanoparticles with thin Pd shell can be successfully synthesized and loaded onto alumina using precise synthesis conditions. Moreover, neither agglomeration nor destruction of the core@shell motif under CO oxidation reaction conditions could be observed, indicating good structural stability. Further, in situ infrared spectroscopy reveals that palladium surface properties differ compared to palladium only particles suggesting electronic and structural modification of the Pd shell surface by the Au core.
Supported core@shell nanoparticles
Chalmers, Kemi och kemiteknik, Tillämpad kemi, Per-Anders Carlsson Group
Yanyue Feng, Andreas Schaefer, Mengqiao Di, Hanna Härelind, Mattias Bauer, and Per-Anders Carlsson. Synthesis and stability of supported Au core-Pd shell nanoparticles with thin shell thickness
Nanovetenskap och nanoteknik (SO 2010-2017, EI 2018-)
Opponent: Associate Prof. Maths Karlsson, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Sweden