By Amit K Naskar; Wesley P Hoffman; American Chemical Society. Division of Polymer Chemistry
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Additional info for Polymer precursor-derived carbon
This is proved by a recent example. An IL monomer, 1-butyl-3-vinylimidazolium bromide ([Bvim][Br]), was copolymerized with acrylonitrile to produce poly([Bvim][Br]-co-acrylonitrile) (13). The Br anion of the as-synthesized PIL copolymer was exchanged with a Pt precursor anion PtCl62−. This process led to a homogeneous distribution of the PtCl62− anion throughout the copolymer matrix. After carbonization, nitrogen-doped carbons with well-dispersed Pt nanoparticles in very high loading amount were obtained.
Detailed studies indicated that, nitrogen atoms in PIL-derived carbons are predominantly bonded in pyridinic or quaternary-graphitic environments, thus as structural nitrogens incorporated into the graphitic microdomains. According to the intensity of the deconvoluted contributions from the XPS spectra, quaternary-graphitic nitrogen is the dominant species in most cases. Higher amounts of pyridinic species are found when high-surface-area carbons are created, which, in fact, could favor the formation of pyridinic carbon in plane termini.
Film Issues Associated with Structure Formation and Maintenance through Carbonization In addition to the complications that can arise in cooperatively assembled thin films due to thickness and interface effects, there are other deleterious factors that can impact the structure of these mesoporous carbon films that are not as pronounced for analogous powders when using resol as the carbonizable precursor. First, the ordering using high molecular weight block copolymer templates can be quite poor in the thin films, even when highly ordered mesostructures are obtained for the analogous powders (40).