Preparation method of frequency-adjustable (SnO2/Sn/rGO) composite wave-absorbing material

A composite wave absorbing material and composite material technology, which are applied in the field of composite wave absorbing materials and their preparation, can solve the problems of undiscussed influence of thermal equilibrium properties/charge accumulation degree, complicated operation, etc., and achieve easy large-scale production, good repeatability, The effect of good absorbing performance

Pending Publication Date: 2022-04-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The macro-control process requires external equipment assistance, complex operation, and it is only applicable to a specific range of absorbing materials (dielectric response to external conditions)
[0004] In addition, there are still limitations in the microscopic theory of FM mechanism
The relationship between relaxation polarization (interface / dipole) and FM mechanism has not been established, and the effect of thermal equilibrium properties / degree of charge accumulation on relaxation polarization / FM mechanism has not been explored

Method used

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  • Preparation method of frequency-adjustable (SnO2/Sn/rGO) composite wave-absorbing material
  • Preparation method of frequency-adjustable (SnO2/Sn/rGO) composite wave-absorbing material
  • Preparation method of frequency-adjustable (SnO2/Sn/rGO) composite wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Dissolve an appropriate amount of GO dispersion in 50mL deionized water until uniform;

[0019] (2) After adding 1mL KH-550 coupling agent, hydrothermal treatment at 180°C for 12h;

[0020] (3) Freeze-dried for 24 hours, calcined at 800°C for 2 hours in an argon atmosphere, and finally obtained rGO monomer. It was measured that its reflection loss RL value was –17.65dB (11.68GHz) when the thickness was 3mm, and it was effective in absorbing waves. The bandwidth is 5.28GHz (RL<-10dB).

Embodiment 2

[0022] (1) 11.2825g of SnCl 2 2H 2 Dissolve O in 10mL of absolute ethanol and stir for 30min; then place in 5mL of deionized water and stir for 1-2h until completely dissolved; add 4mL of tetraethyl orthosilicate (TEOS) to the above solution, stir well; seal at 70°C Aging for 2 days; after drying, soak the sample in NaOH solution (2mol / L) and stir for 30min, wash and filter, and dry at 60°C for 24h; after grinding, calcinate at 550°C, the heating rate is 10°C / min, and the holding time is 4h , to obtain nanoscale SnO 2 ;

[0023] (2) 2g GO, 0.1g nano-SnO 2 Mix with 1ml KH-550 in 50ml deionized water, and obtain C1(SnO 2 / rGO) samples. It is measured that when the thickness is 3mm, the reflection loss RL value is -3.88dB (4.16GHz). Finally, calcined at 500 °C for 2 h under argon atmosphere to generate SnO 2 / rGO composite (C2). When the thickness is 3mm, the reflection loss RL value is -7.41dB (16.88GHz).

Embodiment 3

[0025] (1) Synthesize nanoscale SnO according to the method of step (1) in Example 2 2 , among them, SnCl 2 2H 2 O, the amount of absolute ethanol, deionized water and ethyl orthosilicate is 2mol, 10mL, 5mL and 4mL respectively, and the sealing aging temperature is 60°C;

[0026] (2) Synthesize SnO according to the method of step (2) in Example 2 2 / Sn / rGO composite material (C3), in which the calcination temperature is 600 ℃, the measured reflection loss RL value is -12.47dB (12.32GHz) when the thickness is 3mm.

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Abstract

The invention aims to provide a synthesis method of a frequency-adjustable wave-absorbing material, belongs to the technical field of electronic communication, and particularly relates to a preparation method of a frequency-adjustable SnO2 / Sn / rGO wave-absorbing composite material, which comprises the following steps: preparing a nanoscale SnO2 material by a sol-gel method; finally, the SnO2 / Sn / rGO composite material with the adjustable frequency is successfully prepared by controlling an interface group and a phase structure of the material through processes of hydrothermal treatment, different calcination temperatures and the like, and the frequency modulation mechanism of the SnO2 / Sn / rGO composite material is researched. The composite material has adjustable wave absorbing performance when the thickness of the wave absorbing ring is 3mm, relaxation polarization loss is related to intrinsic carrier concentration and carrier migration, and the composite material plays a key role in microwave loss and a frequency modulation mechanism. And when the interface polarization range is (0.14-2.27), the microwave loss and low-frequency absorption of the composite material are relatively good.

Description

technical field [0001] The invention belongs to the technical field of electronic communication, and relates to a frequency adjustable (SnO 2 / Sn / rGO) composite absorbing material and its preparation method. Background technique [0002] Due to the increasing electromagnetic pollution caused by wireless electronic devices, 4 / 5G networks or artificial intelligence, researchers have conducted extensive research on wave-absorbing materials. Traditional microwave absorbing materials have the characteristics of "thin, light, wide, and strong", but they cannot meet the key requirements of microwave absorption in a specific frequency range. Therefore, it is particularly important to prepare a smart material / device with tunable frequency and selective absorption. [0003] Currently, there exist two tuning strategies (macroscopic and microscopic) to achieve efficient frequency modulation (FM) and specific frequency band absorption. On the one hand, first select the appropriate ele...

Claims

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Application Information

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IPC IPC(8): C09K3/00H05K9/00B82Y30/00B82Y40/00
Inventor 黄小萧夏龙李天天李和奇葛孔禹
Owner HARBIN INST OF TECH
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