Abstract
The development of new composite absorbing materials with lightweight, broadband, and high absorption is an important research direction of functional materials. Aimed at improving the electromagnetic (EM) matching characteristics of graphene and improving its EM wave absorption performance, we successfully prepared titanium dioxide/reduced graphene oxide (TiO2/rGO) aerogels via one-step hydrothermal method and annealing treatment. The amount of TiO2 in the aerogel was controlled by adjusting the addition amount of tetrabutyl orthotitanate (TBOT), and the influence of TiO2 content on the EM parameters and absorption performance was explored. The minimum reflection loss (RLmin) value of − 52.1 dB at 13.24 GHz can be obtained when the volume ratio of GO solution to TBOT solution (VGO:VTBOT) is 10:1, with a wide effective absorption bandwidth (EAB) of 8.57 GHz and the matching thickness (dm) of 3.5 mm. As VGO:VTBOT is 10:2, the EAB in the range of dm of 2.9–3.6 mm is greater than 10 GHz (RL < − 10 dB), and the widest can reach 14.58 GHz (3.42–18 GHz). The introduction of TiO2 nanoparticles can effectively improve the impedance matching characteristics of graphene, and the contact between TiO2 nanoparticles and rGO sheets can also increase the interface polarization ability of the system, resulting in the acquisition of high-performance EM wave-absorbing materials. The preparation method is simple in operation, low in cost, and has a good application prospect, providing us an insight into designing and fabricating other graphene-based EM wave-absorbing materials.
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The data that support the findings of this study are available on request from the corresponding author.
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Funding
This work is supported by the Excellent Youth Scholars of Henan Province (212300410089), the Foundation for University Youth Key Teachers of Henan Province (2020GGJS170), the Support Program for Scientific and Technological Innovation Talents of Higher Education in Henan Province (21HASTIT004), the Natural Science Foundation of Henan Province (202300410488, 202300410491, and 222300420578), and the Key Scientific Research Project of Colleges and Universities in Henan Province (21A150056, 21A430045, 22A430039, and 22A430040).
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HJ and YR contributed to conceptualization, methodology, and writing of the original draft. DF contributed to investigation and data curation. ZZ and ZY contributed to formal analysis and resources collection. DX and RY contributed to conceptualization and investigation. XG and BZ contributed to conceptualization and reviewing & editing of the manuscript.
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Ji, H., Ren, Y., Feng, D. et al. TiO2/rGO aerogels toward ultra-wide electromagnetic wave absorption properties. J Mater Sci: Mater Electron 33, 24381–24395 (2022). https://doi.org/10.1007/s10854-022-09156-y
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DOI: https://doi.org/10.1007/s10854-022-09156-y