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.

中文翻译：

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配体连接的 Pt 纳米粒子的合成和表征：用于催化氢传感的可调谐、三维、多孔网络

由双功能有机配体相互连接的 Pt 纳米颗粒的多孔网络在微机械氢气传感器中显示出作为催化剂的巨大潜力。通过改变对苯二胺、联苯胺、4,4''-二氨基-对-三联苯、1,5-二氨基萘和反式-1,4-二氨基环己烷之间的配体，合成了此类网络的新变体。根据相应配体的标称长度，通过透射电子显微镜断层扫描确定的网络内的粒子间距离从 0.8 到 1.4 nm 不等。虽然与所有配体形成具有完整和配位键合的二胺的稳定结构，但芳族二胺显示出优异的热稳定性。该网络表现出取决于配体和合成策略的介孔结构，并且在氢气微传感器中表现良好。