Abstract
Two dimensional materials have been widely identified as promising microwave absorbers, owing to their large surface area and abundant interfaces. Here, a novel laminated and magnetic composite derived from Mxene was designed and successfully synthesized via facile hydrothermal oxidization of nickel ion intercalated Ti3C2. Highly disordered carbon sheets were obtained by low temperature hydrothermal oxidization, and the in-situ produced TiO2 and NiO nanoparticles embedded closely between them. This layered hybrid exhibits excellent microwave absorbing performance with an effective absorbing bandwidth as high as 11.1 GHz (6.9–18 GHz) and 9 GHz (9–18 GHz) when the thickness is 3 and 2 mm, respectively. Besides the high dielectric loss, magnetic loss and ohmic loss of the composite, the amorphous nature of obtained carbon sheets and multi-reflections between them are believed to play a decisive role in achieving such superior microwave absorbing performance.
Highlights
Mxenes are a new series of two dimensional materials with the formula Mn+1XnTx, where M is an early transition metal, X is carbon and/or nitrogen, Tx is the surface terminations usually -OH and/or –F13
Www.nature.com/scientificreports the enhanced microwave absorbing performance of modified Ti3C2 Mxene and its derives in 2016 and 2017, respectively, which opened a new way to the study of high performance microwave absorbing materials.Ti3C2 as a representative of Mxene family who possess active surface functional terminations, which could give rise to remarkable defects polarizations was proved to be responsible for the promising MA ability
The as-produced hybrids still keep a laminar structure. 2D carbon sheets with embedded TiO2 and NiO nano-particles can be observed from the lateral dimension (Fig. 1(c))
Summary
Mxenes are a new series of two dimensional materials with the formula Mn+1XnTx, where M is an early transition metal, X is carbon and/or nitrogen, Tx is the surface terminations usually -OH and/or –F13. Www.nature.com/scientificreports the enhanced microwave absorbing performance of modified Ti3C2 Mxene and its derives in 2016 and 2017, respectively, which opened a new way to the study of high performance microwave absorbing materials.Ti3C2 as a representative of Mxene family who possess active surface functional terminations, which could give rise to remarkable defects polarizations was proved to be responsible for the promising MA ability. It is highly expected that incorporating magnetic species into oxidized Mxene could be an effective route to obtain high performance EMW absorbing materials. We demonstrate a facile synthesis route towards the preparation of amorphous carbon supported laminated and magnetic hybrids (denoted as NiO&TiO2@C) by the hydrothermal oxidation of nickel ions intercalated Ti3C2. The structure, magnetic, microwave electromagnetic responses and absorbing properties of the as-prepared composites were investigated. Our proposed method provides an important guideline to insert other metal ions into Mxenes and to derive other metal oxide hybrids, which expands the applications of Mxenes
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