Preparation of Graphene/Carbon Aerogel and Its Applied Research in Multi-frequency Band Electromagnetic Interference

doi:10.7503/cjcu20180561

Abstract

Abstract:

The graphene/carbon aerogels material was prepared by sol-gel method. The composite aerogels with different hierarchical micro-nanostructures and high conductivity were prepared. Releasing composite aerogels powder in air, the optic attenuation performance of aerogels was measured at infrared, visible and millimeter waves. The results indicated that the shielding ratio of 7%G-CA powder was above 97% and 94%, correspondingly, at the beginning of release and after 20 min, both in infrared and visible wave band. For millimeter wave band, the shielding ratio of 7%G-CA powder is above 75% and 65%, at the beginning of release and after 10 min, respectively. The study is expected to extend application of smoke jamming.

Key words: Smoke jamming, Graphene, Carbon aerogel, Electromagnetic interference, Multi-frequency band

CLC Number:

O631
O643

TrendMD:

ZHANG Enshuang,LÜ Tong,LIU Tao,HUANG Hongyan,LIU Yuanyuan,GUO Hui,LI Wenjing,ZHAO Yingmin,YANG Jieying. Preparation of Graphene/Carbon Aerogel and Its Applied Research in Multi-frequency Band Electromagnetic Interference[J]. Chem. J. Chinese Universities, 2019, 40(3): 567.

Figures/Tables 10

References 36

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Sample	Bulk density/(g·cm^-3)	Shrinkage rate(%)	Conductivity/(S·m^-1)	D(0.5)/μm
CA	0.154	78	3.89	3.5
2%G-CA	0.092	68	87.6	4.5
4%G-CA	0.030	63	114.2	9.1
5%G-CA	0.014	53	238.5	10.2
7%G-CA	0.009	35	2880	14.8
100%GA	0.126	86	3165	13.8

Sample	Bulk density/(g·cm^-3)	Shrinkage rate(%)	Conductivity/(S·m^-1)	D(0.5)/μm
CA	0.154	78	3.89	3.5
2%G-CA	0.092	68	87.6	4.5
4%G-CA	0.030	63	114.2	9.1
5%G-CA	0.014	53	238.5	10.2
7%G-CA	0.009	35	2880	14.8
100%GA	0.126	86	3165	13.8

Sample	Shield ratio(%)
	Infrared band		Visible band	Millimeter wave
	3—5 μm	8—12 μm	Visible band	Millimeter wave
CA	96.4±1.9(5 s)	90.4±0.9(5 s)	92.7±1.9(5 s)	0(5 s)
	90.0±1.8(20 min)	81.6±1.6(20 min)	90.0±1.8(20 min)	0(10 min)
2%G-CA	99.5±2.0(5 s)	97.6±2.0(5 s)	95.5±1.9(5 s)	33.1±0.3(5 s)
	94.2±1.9(20 min)	83.2±1.6(20 min)	88.9±1.8(20 min)	28.3±0.3(10 min)
4%G-CA	95.0±1.9(5 s)	95.4±1.9(5 s)	95.0±1.9(5 s)	78.0±0.8(5 s)
	92.5±1.8(20 min)	88.4±1.7(20 min)	92.5±1.9(20 min)	60.0±0.6(10 min)
5%G-CA	99.8±2.0(5 s)	98.7±2.0(5 s)	95.4±1.9(5 s)	79.3±0.8(5 s)
	96.9±1.9(20 min)	88.4±1.7(20 min)	94.3±1.9(20 min)	61.8±0.6(10 min)
7%G-CA	99.8±2.0(5 s)	97.2±1.9(5 s)	97.2±1.9(5 s)	75.8±0.8(5 s)
	96.6±1.9(20 min)	95.7±1.9(20 min)	94.0±1.9(20 min)	65.2±0.7(10 min)
100%GA	99.9±2.0(5 s)	97.2±1.9(5 s)	97.9±2.0(5 s)	78.4±0.8(5 s)
	97.8±1.9(20 min)	93.9±1.9(20 min)	80.4±1.6(20 min)	48.9±0.5(10 min)

Sample	Shield ratio(%)
	Infrared band		Visible band	Millimeter wave
	3—5 μm	8—12 μm	Visible band	Millimeter wave
CA	96.4±1.9(5 s)	90.4±0.9(5 s)	92.7±1.9(5 s)	0(5 s)
	90.0±1.8(20 min)	81.6±1.6(20 min)	90.0±1.8(20 min)	0(10 min)
2%G-CA	99.5±2.0(5 s)	97.6±2.0(5 s)	95.5±1.9(5 s)	33.1±0.3(5 s)
	94.2±1.9(20 min)	83.2±1.6(20 min)	88.9±1.8(20 min)	28.3±0.3(10 min)
4%G-CA	95.0±1.9(5 s)	95.4±1.9(5 s)	95.0±1.9(5 s)	78.0±0.8(5 s)
	92.5±1.8(20 min)	88.4±1.7(20 min)	92.5±1.9(20 min)	60.0±0.6(10 min)
5%G-CA	99.8±2.0(5 s)	98.7±2.0(5 s)	95.4±1.9(5 s)	79.3±0.8(5 s)
	96.9±1.9(20 min)	88.4±1.7(20 min)	94.3±1.9(20 min)	61.8±0.6(10 min)
7%G-CA	99.8±2.0(5 s)	97.2±1.9(5 s)	97.2±1.9(5 s)	75.8±0.8(5 s)
	96.6±1.9(20 min)	95.7±1.9(20 min)	94.0±1.9(20 min)	65.2±0.7(10 min)
100%GA	99.9±2.0(5 s)	97.2±1.9(5 s)	97.9±2.0(5 s)	78.4±0.8(5 s)
	97.8±1.9(20 min)	93.9±1.9(20 min)	80.4±1.6(20 min)	48.9±0.5(10 min)