Synthesis and Characterization of Ligand-Linked Pt Nanoparticles: Tunable,Three-Dimensional,Porous Networks for Catalytic Hydrogen Sensing |
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| Authors: | Daniel Loof Oliver Thüringer Dr Marco Schowalter Dr Christoph Mahr Anmona Shabnam Pranti Prof Dr Walter Lang Prof Dr Andreas Rosenauer Dr Volkmar Zielasek Dr Sebastian Kunz Prof Dr Marcus Bäumer |
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| Institution: | 1. Institute of Applied and Physical Chemistry, University of Bremen, Leobener Str. 6, 28359 Bremen, Germany;2. Institute of Solid-State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany;3. Institute for Microsensors, -actuators and -systems (IMSAS), University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany;4. Institute of Applied and Physical Chemistry, University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
Südzucker AG, Central Department Research, Development, and Services (CRDS), Wormser Strasse 11, 67283 Obrigheim, Germany |
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| Abstract: | Porous networks of Pt nanoparticles interlinked by bifunctional organic ligands have shown high potential as catalysts in micro-machined hydrogen gas sensors. By varying the ligand among p-phenylenediamine, benzidine, 4,4‘‘-diamino-p-terphenyl, 1,5-diaminonaphthalene, and trans-1,4-diaminocyclohexane, new variants of such networks were synthesized. Inter-particle distances within the networks, determined via transmission electron microscopy tomography, varied from 0.8 to 1.4 nm in accordance with the nominal length of the respective ligand. While stable structures with intact and coordinatively bonded diamines were formed with all ligands, aromatic diamines showed superior thermal stability. The networks exhibited mesoporous structures depending on ligand and synthesis strategy and performed well as catalysts in hydrogen gas microsensors. They demonstrate the possibility of deliberately tuning micro- and mesoporosity and thereby transport properties and steric demands by choice of the right ligand also for other applications in heterogeneous catalysis. |
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| Keywords: | Amines derivatives bifunctional ligands heterogeneous catalysis nanoparticles platinum |
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