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

• Published in: Journal of alloys and compounds 2017-12, Vol.728, p.138-144
• Main Authors: Ma, Jianna, Liu, Wei, Liang, Xiaohui, Quan, Bin, Cheng, Yan, Ji, Guangbin, Meng, Wei
• Format: Article
• Language: English
• Subjects: Dielectric loss; Lightweight; Microwave absorption; MIL-125 (Ti); MOFs
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.08.274

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 Co-based, 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. [Display omitted] •The titanium based MOFs were firstly used to prepare nanoporous TiO2/C composites.•The dielectric loss and microwave absorption properties can be regulated by adjusting the calcination temperature.•An optimal reflection loss and wide frequency bandwidth is achieved with an ultrathin matching thickness.•The synthetic process of TiO2/C composites is simple.