Block‐Copolymer‐Templated Synthesis of Electroactive RuO2‐Based Mesoporous Thin Films |
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Authors: | Capucine Sassoye Christel Laberty Hung Le Khanh Sophie Cassaignon Cédric Boissière Markus Antonietti Clément Sanchez |
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Affiliation: | 1. Laboratoire de Chimie de la Matière Condensée UMR UPMC–CNRS 7574 4 Place Jussieu, 75252 Paris Cedex 05 (France);2. Max Planck Institute of Colloids and Interfaces Research Campus Golm 14424 Potsdam (Germany);3. Present address: UPMC Univ. Paris 06, UMR CNRS 7574, Chimie de la Matière Condensée de Paris, Collège de France, 11 place Marcellin Berthelot, Bat D, 75231 Paris, France |
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Abstract: | RuO2‐based mesoporous thin films of optical quality are synthesized from ruthenium‐peroxo‐based sols using micelle templates made of amphiphilic polystyrene‐polyethylene oxide block copolymers. The mesoporous structure and physical properties of the RuO2 films (mesoporous volume: 30%; pore diameter: ~30 nm) can be controlled by the careful tuning of both the precursor solution and thermal treatment (150–350 °C). The optimal temperature that allows control of both mesoporosity and nanocristallinity is strongly dependent on the substrate (silicon or fluorine‐doped tin oxide). The structure of the resulting mesoporous films are investigated using X‐ray diffraction, X‐ray photoelectron spectroscopy, and atomic force microscopy. Mesoporous layers are additionally characterized by transmission and scanning electron microscopy and ellipsometry while their electrochemical properties are analyzed via cyclic voltammetry. Thick mesoporous films of ruthenium oxide hydrates, RuO2 · xH2O, obtained using a thermal treatment at 280 °C, exhibit capacitances as high as 1000 ± 100 F g?1 at a scan rate of 10 mV s?1, indicating their potential application as electrode materials. |
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Keywords: | block copolymers electrodes nanostructures porous materials thin films |
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