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Title

Electrochemically Exfoliated Graphene-Like Nanosheets for Use in Ceramic Nanocomposites

AuthorsPoyato, Rosalía ; Verdugo, Reyes; Muñoz-Ferreiro, Carmen; Gallardo-López, Ángela
KeywordsGraphene
Electrochemical exfoliation method
3YTZP
Ceramic nanocomposites
Planetary ball milling
SPS
Raman spectroscopy
Electron microscopy
Vickers indentations
Issue Date2020
PublisherMultidisciplinary Digital Publishing Institute
CitationMaterials, 13: 2656 (2020)
AbstractIn this work, the synthesis of graphene-like nanosheets (GNS) by an electrochemical exfoliation method, their microstructural characterization and their performance as fillers in a ceramic matrix composite have been assessed. To fabricate the composites, 3 mol % yttria tetragonal zirconia (3YTZP) powders with 1 vol % GNS were processed by planetary ball milling in tert-butanol to enhance the GNS distribution throughout the matrix, and densified by spark plasma sintering (SPS). According to a thorough Raman analysis and SEM observations, the electrochemically exfoliated GNS possessed less than 10 graphene layers and a lateral size lower than 1 m. However, they contained amorphous carbon and vacancy-like defects. In contrast the GNS in the sintered composite exhibited enhanced quality with a lower number of defects, and they were wavy, semi-transparent and with very low thickness. The obtained nanocomposite was fully dense with a homogeneous distribution of GNS into the matrix. The Vickers hardness of the nanocomposite showed similar values to those of a monolithic 3YTZP ceramic sintered in the same conditions, and to the reported ones for a 3YTZP composite with the same content of commercial graphene nanosheets.
Publisher version (URL)https://doi.org/10.3390/ma13112656
URIhttp://hdl.handle.net/10261/216102
DOIhttp://dx.doi.org/10.3390/ma13112656
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