Molecularly rigid microporous polyamine captures and stabilizes conducting platinum nanoparticle networks

Daping He, Dong Sheng He, Jinlong Yang, Ze Xian Low, Richard Malpass-Evans, Mariolino Carta, Neil B. McKeown, Frank Marken

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A molecularly rigid polyamine based on a polymer of intrinsic microporosity (PIM-EA-TB) is shown to capture and stabilize platinum nanoparticles during colloid synthesis in the rigid framework. Stabilization here refers to avoiding aggregation without loss of surface reactivity. In the resulting rigid framework with embedded platinum nanoparticles, the volume ratio of platinum to PIM-EA-TB in starting materials is varied systematically from approximately 1.0 to 0.1 with the resulting platinum nanoparticle diameter varying from approximately 4.2 to 3.1 nm, respectively. Elemental analysis suggests that only a fraction of the polymer is "captured" to give nanocomposites rich in platinum. A transition occurs from electrically conducting and electrochemically active (with shorter average interparticle distance) to nonconducting and only partially electrochemically active (with longer average interparticle distance) polymer-platinum composites. The conducting nanoparticle network in the porous rigid macromolecular framework could be beneficial in electrocatalysis and in sensing applications.

Original languageEnglish
Pages (from-to)22425-22430
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number34
Publication statusPublished - 31 Aug 2016


  • electrocatalysis
  • fuel cells
  • membrane
  • percolation
  • stabilization
  • tunneling


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