Metal-ceramics nanoparticles

Noble metals on ceramic particles are important in sensors, electronics and most notably in catalysis. The size of the noble metal has a profound influence on the material performance e. g. for structure sensitive reactions, and sensor sensitivity. Though typically these materials are made by multi-step wet-chemistry processes, recently, flame technology has been used for one-step synthesis of Pt, Pd, Ag and Au nanoparticles on various nanostructured supports. The as-prepared materials exhibit a high external specific surface area with a high degree of crystallinity and an excellent noble metal dispersion.

Flame synthesis of bimetallic Pd-Pt particles supported on Al2O3 results in the formation of small alloyed Pd-Pt particles.

Recent, relevant references:

• Strobel, R., Stark, W.J., Mädler, L., Pratsinis, S. E. and Baiker A. "Structural Properties and Behaviour in Enantioselective Hydrogenation of Flame-made platinum/alumina", J. Catal. 213, 296-304, (2003).
• Strobel, R., F. Krumeich, W. J. Stark, S. E. Pratsinis, A. Baiker, “Flame spray synthesis of Pd/Al2O3 catalysts and their behavior in enantioselective hydrogenation”, J. Catal., 222 (2), 307-314 (2004).
• Mädler, L., W. Stark, S.E. Pratsinis, "Simultaneous deposition of gold nanoparticles during flame synthesis of titania and silica", J. Mater. Res., 18, 115-120 (2003).
• Schulz, H., L. Mädler, R. Strobel, R. Jossen, S. E. Pratsinis, and T. Johannessen, "Independent control of metal cluster and ceramic particle characteristics during one-step synthesis fo Pt/TiO2", J. Mater. Res., 20, 2568-77 (2005).
• Strobel, R., S. E. Pratsinis, A. Baiker, "Flame-made Pd/La2O3/Al2O3 nanoparticles: thermal stability and catalytic behavior in methane combustion", J. Mater. Chem., 15 (5), 605-610 (2005).
• Strobel, R., J. D. Grunwaldt, A. Camenzind, S. E. Pratsinis, A. Baiker, "Flame-made alumina supported Pd–Pt nanoparticles: Structural properties and catalytic behavior in methane combustion", Catal. Lett., 104 (1-2) 9-16 (2005).