Enhanced physical properties of γ-Al 2 O 3 -rGO hybrids prepared by solvothermal and hot-press processing

In this study, a solvothermal method was employed for the first time to fabricate hybrids composed of cross-linked γ-Al O nanorods and reduced graphite oxide (rGO) platelets. After calcination and hot-press processing, monoliths of Al O -rGO hybrids were obtained with improved physical properties. I...

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Bibliographic Details
Published in:RSC advances 2018-02, Vol.8 (15), p.8329-8337
Main Authors: Ikram, Mujtaba, Tao, Zhuchen, Ye, Jianglin, Qayyum, Hafiz Adil, Sun, Xuemei, Xu, Jin
Format: Article
Language:English
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Summary:In this study, a solvothermal method was employed for the first time to fabricate hybrids composed of cross-linked γ-Al O nanorods and reduced graphite oxide (rGO) platelets. After calcination and hot-press processing, monoliths of Al O -rGO hybrids were obtained with improved physical properties. It was found that the oxygen-containing groups on graphene oxide were beneficial for the adsorption of aluminum isopropoxide, leading to a uniform dispersion of rGO with Al O , which was obtained by hydrolysis of aluminum isopropoxide during the solvothermal reaction. The hybrid, which was subsequently calcinated for 3 h showed electrical conductivity of 6.7 × 10 S m together with 90% higher mechanical tensile strength and 80% higher thermal conductivity as compared to the bare Al O . In addition, the dielectric constant of the hybrid was 12 times higher than that of the bare Al O . In this study, the highest values of electrical conductivity (8.2 × 10 S m ), thermal conductivity (2.53 W m K ), dielectric constant (10 ) and Young's modulus (3.7 GPa) were obtained for the alumina-rGO hybrid calcinated for 1 h. XRD characterization showed that an increase in calcination temperature and further hot-press processing at 900 °C led to enhanced crystallinity in the γ-Al O nanorods in the hybrid, resulting in enhanced physical properties in the hybrids.
ISSN:2046-2069
2046-2069
DOI:10.1039/C8RA00095F