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Preparation of graphene by using an intense cavitation field in a pressurized ultrasonic reactor
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SYSNO ASEP 0382567 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Preparation of graphene by using an intense cavitation field in a pressurized ultrasonic reactor Author(s) Štengl, Václav (UACH-T) RID, ORCID, SAI Source Title Chemistry - A European Journal. - : Wiley - ISSN 0947-6539
Roč. 18, č. 44 (2012), s. 14047-14054Number of pages 8 s. Language eng - English Country DE - Germany Keywords cavitation field ; graphene ; nanostructures ; ultrasound ; X-ray diffraction Subject RIV CA - Inorganic Chemistry Institutional support UACH-T - RVO:61388980 UT WOS 000310473900020 DOI https://doi.org/10.1002/chem.201201411 Annotation A new and efficient method to produce a large quantity of high-quality and non-oxidized graphene flakes from powdered natural graphite by using a high-intensity cavitation field in a pressurized ultrasonic reactor is demonstrated. TEM and selected-area electron diffraction (SAED) confirmed the ordered graphite crystal structure of graphene. Atomic force microscopy (AFM) was used to examine the thickness of the graphene sheets. The delamination (exfoliation) of natural graphite in the liquid phase depends on the physical effects of ultrasound, which break down the 3D graphite structure into a 2D graphene structure. The prepared graphene is of high purity and without defects because no strongly oxidizing chemicals are used and no toxic products result. TEM shows that graphene nanosheets were produced with sizes in the range of tens to hundreds of square nanometers; these nanosheets were smooth and without any ripples and corrugations. High-resolution TEM (HRTEM) and SAED analysis confirmed that the products were graphene nanosheets. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2013
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