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Grießer, Thomas
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Publications (5/5 displayed)
- 2023Solution-Processable Cu3BiS3 Thin Films: Growth Process Insights and Increased Charge Generation Properties by Interface Modificationcitations
- 2019UV-Induced reduction of graphene oxide in cellulose nanofibril compositescitations
- 2018Characterization of Surface and Structure of In Situ Doped Sol-Gel-Derived Silicon Carbidecitations
- 2017Simple method for the quantitative analysis of thin copolymer films on substrates by infrared spectroscopy using direct calibrationcitations
- 2014Photoregeneration of Trimethylsilyl Cellulose as a Tool for Microstructuring Ultrathin Cellulose Supportscitations
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article
UV-Induced reduction of graphene oxide in cellulose nanofibril composites
Abstract
<p>We report on an effective dry method to reduce graphene oxide (GO) in films of cellulose nanofibrils (CNF) by UV irradiation in the presence of nitrogen gas. The reduction of GO and the removal of carbonyl and carboxyl moieties were confirmed by infrared and UV-vis spectroscopy, potentiometric charge titration and X-ray photoelectron spectroscopy (XPS). The crystallinity of native and reduced composites was elucidated by X-ray diffraction measurements. The resulting reduced graphene oxide-CNF nanocomposite films remain flexible and show improved dielectric properties. After 5 hours of UV irradiation a 3 wt% graphene oxide loaded film increased its dielectric constant from 68.9 to 88.9, which shows significant enhancement compared to previous reports. The AC conductivity of reduced GO films reaches values of 9.37 × 10<sup>−4</sup>S m<sup>−1</sup>. The electrochemical performance of the samples was tested by cyclic voltammetry and electrochemical impedance spectroscopy. UV treated samples showed a higher capacitive nature than untreated samples. The UV induced reduction of GO in the presence of CNF is seen as a promising alternative to solvent based methods.</p>