Article
Unravelling the optimization of few-layer graphene crystallinity and electrical conductivity in ceramic composites by Raman spectroscopy
Author/s | Muñoz Ferreiro, Carmen
López Pernía, Cristina Gallardo López, Ángela María Poyato Galán, Rosalía |
Department | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Publication Date | 2021 |
Deposit Date | 2022-10-17 |
Published in |
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Abstract | Zirconia composites with few-layer graphene (FLG) were prepared by two powder processing routines -ultrasonic agitation or planetary ball milling- and spark plasma sintered at 1250 and 1300 °C. An in-depth study of the ... Zirconia composites with few-layer graphene (FLG) were prepared by two powder processing routines -ultrasonic agitation or planetary ball milling- and spark plasma sintered at 1250 and 1300 °C. An in-depth study of the crystallinity of FLG, in terms of presence and nature of defects, was performed by Raman spectroscopy, revealing enhanced FLG crystallinity after sintering. This enhancement was more noticeable in the composites sintered at the highest temperature, with lower amount of structural defects and amorphous carbon. However, remaining amorphous carbon was detected in the composites prepared by planetary ball milling even after sintering at the highest temperature, resulting in lower electrical conductivities. Optimum results in terms of electrical conductivity were achieved for the composites prepared by ultrasonic agitation and sintered at 1300 °C, with electrical percolation limit below 2.5 vol% FLG and high electrical conductivity (678 S/m for 5 vol% FLG), as result of the enhanced FLG crystallinity after sintering. |
Funding agencies | Ministerio de Ciencia, Innovación y Universidades (MICINN). España Ministerio de Asuntos Económicos y Transformación Digital (MINECO). España Universidad de Sevilla |
Project ID. | PGC 2018- 101377-B-100
BES-2016- 078711 USE-18740-H |
Citation | Muñoz Ferreiro, C., López Pernía, C., Gallardo López, Á.M. y Poyato Galán, R. (2021). Unravelling the optimization of few-layer graphene crystallinity and electrical conductivity in ceramic composites by Raman spectroscopy. Journal of the European Ceramic Society, 41 (16), 290-298. https://doi.org/10.1016/j.jeurceramsoc.2021.09.025. |
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