In situ fabrication and characterization of cobalt ferrite nanorods/graphene composites |
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| Affiliation: | 1. Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan;2. Department of Agricultural Chemistry, The University of Agriculture, Peshawar, Pakistan;3. Department of Chemistry, University of Hafr Al Batin, Saudi Arabia;4. Department of Physics, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan;1. State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, 116024, China;2. Liaoning Key Laboratory of Advanced Polymer Matrix Composites, Shenyang Aerospace University, Shenyang, 110136, China;1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, People’s Republic of China;2. School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, People’s Republic of China;3. Wuhu Research Institute of Anhui University of Science and Technology, Wuhu 241000, People’s Republic of China;1. Applied and Analytical Chemistry Laboratory, Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad 22060, Khyber Pakhtunkhwa, Pakistan;2. Interdisciplinary Research Center in Biomedical Materials, COMSATS Institute of Information Technology, Lahore, Pakistan;3. National Center of Excellence in Physical Chemistry, University of Peshawar, Pakistan;4. Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan |
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| Abstract: | Cobalt ferrite nanorods/graphene composites were prepared by a one-step hydrothermal process using NaHSO3 as the reducing agent and 1-propyl-3-hexadecylimidazolium bromide as the structure growth-directing template. The reduction of graphene oxide and the in situ formation of cobalt ferrite nanorods were accomplished in a one-step reaction. The structure and morphology of as-obtained composites were characterized by field emission scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy, atomic force microscope, X-ray diffractometer, Fourier transform infrared spectra, X-ray photoelectron spectroscopy and Raman spectroscopy. Uniform rod-like cobalt ferrites with diameters of about 100 nm and length of about 800 nm were homogeneously distributed on the graphene sheets. The hybrid materials showed a saturation magnetization of 42.5 emu/g and coercivity of 495.1 Oe at room temperature. The electromagnetic parameters were measured using a vector network analyzer. A minimum reflection loss (RL) of − 25.8 dB was observed at 16.1 GHz for the cobalt ferrite nanorods/graphene composites with a thickness of 2 mm, and the effective absorption frequency (RL < − 10 dB) ranged from 13.5 to 18.0 GHz. The composites exhibited better absorbing properties than the cobalt ferrite nanorods and the mixture of cobalt ferrite nanorods and graphene. |
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