Abstract
In this study, monoliths of SiO2-rGO hybrids were obtained with improved physical properties by calcination-hot press processing. It was found that the oxygen-containing groups on graphene oxide were beneficial for the adsorption of ethyl silicate (C8H20O4Si), leading to the uniform dispersion of rGO with SiO2, which was obtained by hydrolysis of ethyl silicate during the hydrothermal reaction. The hybrid, which was subsequently calcinated for 1 h showed electrical conductivity of 0.143 S m−1 together with higher thermal conductivity (1.612 Wm−1k−1), dielectric constant (107), BET surface area (712.01 m2g−1), and higher tensile strength (225.74 MPa). In addition, the enhanced value of electrical conductivity (0.02 S m−1), thermal conductivity (1.439 Wm−1k−1), dielectric constant (500), tensile strength (98 MPa), and BET surface area (611.21 m2g−1) were obtained for the silica-rGO (1.55 wt% rGO) as compared to the bare SiO2. XRD characterization showed that an increase in calcination temperature and further hot-press processing at 750 °C led to enhanced crystallinity in the SiO2 spheres in the hybrid, resulting in enhanced physical properties in the hybrids.
Original language | English |
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Pages (from-to) | 364-371 |
Number of pages | 8 |
Journal | Journal of Solid State Chemistry |
Volume | 265 |
DOIs | |
State | Published - Sep 2018 |
Bibliographical note
Publisher Copyright:© 2018 Elsevier Inc.
Keywords
- Calcination
- Graphene
- Hot pressing
- Hydrothermal
- Physical properties
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry