Ikram Mujtaba, Tao Zhuchen, Ye Jianglin, Qayyum Hafiz Adil, Sun Xuemei, Xu Jin
Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Department of Materials Science and Engineering, University of Science and Technology of China Hefei Anhui 230026 P. R. China
Physics Department, King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia.
RSC Adv. 2018 Feb 22;8(15):8329-8337. doi: 10.1039/c8ra00095f. eCollection 2018 Feb 19.
In this study, a solvothermal method was employed for the first time to fabricate hybrids composed of cross-linked γ-AlO nanorods and reduced graphite oxide (rGO) platelets. After calcination and hot-press processing, monoliths of AlO-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 AlO, 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 AlO. In addition, the dielectric constant of the hybrid was 12 times higher than that of the bare AlO. 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-AlO nanorods in the hybrid, resulting in enhanced physical properties in the hybrids.
在本研究中，首次采用溶剂热法制备了由交联γ-AlO纳米棒和还原氧化石墨烯（rGO）片组成的杂化物。经过煅烧和热压处理后，获得了具有改善物理性能的AlO-rGO杂化物整体材料。研究发现，氧化石墨烯上的含氧基团有利于异丙醇铝的吸附，导致rGO与AlO均匀分散，这是在溶剂热反应过程中通过异丙醇铝水解获得的。随后煅烧3小时的杂化物显示出6.7×10 S m的电导率，与纯AlO相比，机械拉伸强度提高了90%，热导率提高了80%。此外，杂化物的介电常数比纯AlO高12倍。在本研究中，煅烧1小时的氧化铝-rGO杂化物获得了最高的电导率（8.2×10 S m）、热导率（2.53 W m K）、介电常数（10）和杨氏模量（3.7 GPa）。XRD表征表明，煅烧温度的升高以及在900°C下进一步的热压处理导致杂化物中γ-AlO纳米棒的结晶度提高，从而使杂化物的物理性能增强。
