本文關(guān)鍵詞： 石墨烯海綿 電磁屏蔽性能 PDMS 柔性石墨烯薄膜　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：石墨烯具有優(yōu)異的電學(xué)性能,在電磁屏蔽領(lǐng)域的應(yīng)用潛力巨大。在實(shí)際應(yīng)用的過程中,二維石墨烯納米片不容易操控,影響石墨烯電學(xué)性能的發(fā)揮。而三維石墨烯海綿比二維石墨烯納米片更容易操控,是發(fā)揮石墨烯優(yōu)異電學(xué)性能的有效途徑。本論文基于三維石墨烯海綿制備了石墨烯材料,并且重點(diǎn)研究了他們的電磁屏蔽性能,具體的研究內(nèi)容如下:利用冷凍干燥的方法制備了氧化石墨烯海綿,并通過水合肼還原得到了石墨烯海綿。通過將聚二甲基硅氧烷(PDMS)與石墨烯海綿復(fù)合,制備得到了石墨烯海綿/PDMS復(fù)合材料。在復(fù)合之前,通過熱處理的方法,提高了石墨烯海綿的電學(xué)性能。當(dāng)石墨烯的質(zhì)量分?jǐn)?shù)為3.07%時(shí),復(fù)合材料的電導(dǎo)率達(dá)到了103S/m,并且當(dāng)復(fù)合材料的厚度為2mm,在8~12GHz的頻率范圍,復(fù)合材料的平均電磁屏蔽性能可以達(dá)到54.26d B。通過對石墨烯海綿/PDMS復(fù)合材料的電磁屏蔽機(jī)理分析,吸收屏蔽效能占總屏蔽效能的主要部分,表明石墨烯海綿/PDMS復(fù)合材料是以吸收為主的電磁屏蔽材料。利用冷凍干燥的方法制備了氧化石墨烯海綿,并通過水合肼還原得到了石墨烯海綿。通過原位熱壓的工藝制備得到了基于石墨烯三維網(wǎng)絡(luò)的柔性石墨烯薄膜。對柔性石墨烯薄膜電學(xué)、導(dǎo)熱、電磁屏蔽性能和對X射線的透過性能進(jìn)行了研究。柔性石墨烯薄膜的電導(dǎo)率達(dá)到1.14×105S/m,熱導(dǎo)率達(dá)到1073.83 W/(m·K),并且薄膜厚度在50μm的條件,頻率在1.7GHz~40GHz的范圍內(nèi),電磁屏蔽效能最低值超過50d B。通過對柔性石墨烯薄膜的電磁屏蔽機(jī)理進(jìn)行分析,吸收屏蔽效能占總屏蔽效能的主要部分,表明柔性石墨烯薄膜是以吸收為主的電磁屏蔽材料。隨著X射線能量的增加,更容易透過柔性石墨烯薄膜。
[Abstract]:Graphene has excellent electrical properties and has great potential in electromagnetic shielding. In practical applications, two-dimensional graphene nanocrystals are not easy to manipulate. It is an effective way to exert the excellent electrical properties of graphene by using 3D graphene sponge, which is easier to manipulate than two-dimensional graphene nanosheet. In this paper, graphene materials were prepared based on 3D graphene sponge. Their electromagnetic shielding properties were studied. The main contents were as follows: graphene oxide sponge was prepared by freeze-drying method. The graphene sponge was synthesized by hydrazine hydrate reduction. The graphene sponge / PDMS composite was prepared by combining polydimethylsiloxane (PDMS) with graphene sponge. The electrical properties of graphene sponges are improved. When the mass fraction of graphene is 3.07, the electrical conductivity of the composites reaches 103 S / m, and when the thickness of the composite is 2 mm, the frequency range is 812 GHz. The average electromagnetic shielding performance of the composite can reach 54.26 dB. By analyzing the electromagnetic shielding mechanism of graphene sponge / PDMS composite, the absorption shielding efficiency accounts for the main part of the total shielding efficiency. The results showed that graphene sponge / PDMS composite was an absorbing electromagnetic shielding material, and graphene oxide sponge was prepared by freeze-drying method. The graphene sponge was prepared by hydrazine hydrate reduction, and the flexible graphene film was prepared by in-situ hot pressing. The electromagnetic shielding properties and X-ray transmittance of flexible graphene thin films are studied. The conductivity of flexible graphene thin films is 1.14 脳 10 ~ 5 S / m, the thermal conductivity is 1073.83 W / m 路K ~ (-1), the thickness of the films is 50 渭 m, and the frequency is within 1.7 GHz. The minimum electromagnetic shielding efficiency is more than 50 dB. By analyzing the electromagnetic shielding mechanism of the flexible graphene film, the absorption shielding efficiency accounts for the main part of the total shielding effectiveness. It is shown that the flexible graphene film is a kind of electromagnetic shielding material which is mainly absorbed, and it is easier to pass through the flexible graphene film with the increase of X-ray energy.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB332;O613.71

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 Yanfeng Ma;Yongsheng Chen;;Three-dimensional graphene networks: synthesis,properties and applications[J];National Science Review;2015年01期

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本文編號(hào)：1527445