Iron oxide-nitrogen doped carbon micro-tube composite wave-absorbing material and preparation method thereof
A composite absorbing material and iron oxide technology, applied in the field of absorbing materials, can solve the problems of high density of absorbing materials, narrow absorbing frequency range, poor absorbing performance, etc., to overcome the problems of high density and excellent absorbing performance. , the effect of good application prospects
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Embodiment 1
[0046] Weigh 0.80g NiCl with electronic balance 2 ·6H 2 O(3.35×10 -3 mol) and 1.36g FeCl 2 4H 2 O(6.75×10 -3 mol), dissolved in 30 mL of deionized water, stirred evenly and then ultrasonicated for 30 minutes. Weigh 0.01 g of melamine foam, soak it in the above metal salt solution, and perform ultrasonic adsorption for 20 minutes. After letting the melamine foam dry naturally, see figure 1 , placed in a tube furnace, and calcined at 850°C for 2 hours in a mixed atmosphere of 99.5% nitrogen + 0.5% oxygen to obtain NiFe 2 o 4 - Nitrogen-doped carbon microtube composites. NiFe 2 o 4 The content in the composite material is 90%. figure 2 For the scanning electron micrograph of composite material synthesized in this embodiment, it can be seen that NiFe 2 o 4 Nanoparticles are uniformly supported on nitrogen-doped carbon microtubes. Adopt X-ray diffractometer to characterize the NiFe that the present invention prepares 2 o 4 -Crystal structure of nitrogen-doped carbo...
Embodiment 2
[0048] Weigh 0.67g Co(NO 3 ) 2 ·6H 2 O(2.3×10- 3 mol) and 1.87g Fe(NO 3 ) 2 9H 2 O(4.6×10- 3 mol), dissolved in 30 mL of deionized water, stirred evenly and then ultrasonicated for 30 minutes. Weigh 0.05 g of melamine foam, soak it in the above metal salt solution, and perform ultrasonic adsorption for 20 minutes. After the melamine foam is naturally dried, it is placed in a tube furnace and calcined at 850°C for 2 hours in a mixed atmosphere of 99.5vol% nitrogen + 0.5vol% oxygen to obtain CoFe 2 o 4 - Nitrogen-doped carbon microtube composites. The content of iron oxide in the composite material is 75%. CoFe 2 o 4 -The nitrogen-doped carbon microtube composite absorbing material has good absorbing performance. At 5.6GHz, the reflection loss peak of the 4mm composite material sample is -30.5dB, and the effective bandwidth of RL<-10dB is 3.9GHz, which can effectively absorb electromagnetic waves in this frequency band.
Embodiment 3
[0050] Weigh 0.33g CuSO with an electronic balance 4 (1.3×10- 3 mol) and 1.05g Fe 2 (SO 4 ) 3 (2.6×10- 3 mol), dissolved in 30 mL of deionized water, stirred evenly and then ultrasonicated for 30 minutes. Weigh 0.05 g of melamine foam, soak it in the above metal salt solution, and perform ultrasonic adsorption for 20 minutes. After the melamine foam is naturally dried, it is placed in a tube furnace and calcined at 750°C for 3 hours in a mixed atmosphere of 99.5vol% nitrogen + 0.5vol% oxygen to obtain CuFe 2 o 4 - Nitrogen-doped carbon microtube composites. The content of iron oxide in the composite material is 80%. The iron oxide-nitrogen-doped carbon microtube composite absorbing material has good absorbing properties. At 4.4GHz, the reflection loss peak of the 4mm composite material sample is -29.5dB, and the effective bandwidth of RL<-10dB is 2.9GHz, which can effectively absorb electromagnetic waves in this frequency band.
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