Nanoporous TiO2/C composites synthesized from directly pyrolysis of a Ti-based MOFs MIL-125(Ti) for efficient microwave absorption

Nanoporous carbon materials derived from metal organic frameworks (MOFs) have been regarded as an important members in the microwave absorption field. Nevertheless, most attentions only focus on Cobased, Ni-based MOFs and the impedance matching. In this study, a novel nanoporous carbon material (TiO2/C) has been directly synthesized by annealing titanium based MOFs (MIL-125 (Ti), MIL stands for Material from Institute Lavoisier), which possess low toxicity, redox activity and good stability. The obtained TiO2/C composites show outstanding electromagnetic wave absorbing properties. In detail, the minimum reflection loss of -49.6 dB and broad effective bandwidth of 4.6 GHz (13.4-18 GHz) can be reached with an absorbent thickness of 1.6 mm. Our study not only opens a new avenue for artificially designed diverse nanoporous carbon but also introduce a new candidate to directly synthesize absorber by a simple method. (C) 2017 Elsevier B.V. All rights reserved.