科研之友
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摘要
The purposive and rational construction of novel multicomponent composites is highly attractive in order to achieve outstanding electromagnetic wave absorption properties. Transition metal-carbon composites derived from metal-organic frameworks (MOFs) have received increasing attention in this field. In our work, copper and indium metals were directly embedded in the dual active sites of porphyrins consisting of a central ring (N-H) and a peripheral carboxyl group (COOH) by employing a facile solvothermal process to prepare the single-crystal material of CuIn-PMOFs with periodically arranged structures (C50H32CuInN5O8). Afterwards, copper indium/carbon nitrogen (CuIn/CN) composites were synthesized via only in situ pyrolysis of CuIn-PMOFs without further adjustment of the bimetallic ratios. Concretely, due to the improved impedance matching and increased dielectric loss, the CuIn/CN composites prepared at 600 degrees C (CuIn/CN-600) display a maximum reflection loss (RL) of -78.42 dB at 13.84 GHz with an effective absorption bandwidth (EAB) of about 5.92 GHz (12.08-18 GHz) at 1.92 mm. Therefore, our work delivers a convenient and advanced prototype for the design of controllable MOF-derived composites as exceptional microwave absorbers with high absorption and broad bandwidth. @@@ CuIn/CN-600 shows a maximum RL of -78.42 dB at 13.84 GHz with an EAB of about 5.92 GHz at 1.92 mm.
