am0c10385_si_003.mp4 (1.41 MB)
Terpolymer Multicompartment Nanofibers as Templates for Hybrid Pt Double Helices
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posted on 2020-08-21, 21:13 authored by Stefanie Tjaberings, Markus Heidelmann, Alexander Tjaberings, Andrea Steinhaus, Steffen Franzka, Bernd Walkenfort, André H. GröschelHybrid
inorganic/block copolymer (BCP) materials have become increasingly
relevant for application in heterogeneous catalysis, microelectronics,
and nanomedicine. While block copolymer templates are widely used
for the formation of inorganic nanostructures, multicompartment templates
could give access to more complex shapes and inner structures that
are challenging to obtain with traditional processes. Here, we report
the formation and characterization of hybrid platinum/polymer helices
using multicompartment nanofibers (MCNFs) of polystyrene-block-polybutadiene-block-poly(tert-butyl
methacrylate) (PS-b-PB-b-PT) triblock
terpolymers as templates. Cross-linking of a PS-b-PB-b-PT helix-on-cylinder morphology resulted in
uniform nanofibers with a diameter of 90 nm and a length of several
micrometers, as well as an inner PB double helix (diameter 35 nm,
pitch 25 nm, core 12 nm). The PB double helix served as template for
the sol–gel reaction of H2PtCl6 into
hybrid Pt double helices (Pt@MCNFs) as verified by STEM, electron
tomography, AFM, and SEM. Carbonization of the Pt hybrids into Pt
decorated carbon nanofibers (Pt@C) was followed in situ on a TEM heating
state. Gradual heating from 25 to 1000 °C induced fusion
of amorphous Pt NPs into larger crystalline Pt NP, which sheds light
on the aging of Pt NPs in BCP scaffolds under high temperature conditions.
The Pt@MCNFs were further sulfonated and incorporated into a filter
to catalyze a model compound in a continuous flow process.