title: Molecularly Rigid Microporous Polyamine Captures and Stabilizes Conducting Platinum Nanoparticle Networks.
abstract: 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.
authors: Daping
authors: D
authors: He
authors: Materials Characterization and Preparation Center, South University of Science and Technology of China , Shenzhen 518055, China.
authors: Dong Sheng
authors: DS
authors: He
authors: School of Advanced Materials, Peking University Shenzhen Graduate School , Shenzhen 518055, China.
authors: Jinlong
authors: J
authors: Yang
authors: Ze-Xian
authors: ZX
authors: Low
authors: School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K.
authors: Richard
authors: R
authors: Malpass-Evans
authors: School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K.
authors: Mariolino
authors: M
authors: Carta
authors: School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, U.K.
authors: Neil B
authors: NB
authors: McKeown
authors: Frank
authors: F
authors: Marken
keywords: electrocatalysis; fuel cells; membrane; percolation; stabilization; tunneling