製備石墨烯/奈米銀線/聚乙烯醇複合薄膜於電磁波屏蔽之應用

Preparing Graphene/Silver nanowires/ Polyvinyl alcohol complex thin films for Electromagnetic Interference Shielding Application

陳相宏(Chen, Hsiang Hung)

指導教授 ： 李育德

國立清華大學/工學院/化學工程學系/碩士(2015年)

摘要

隨著電子設備在軍事、工業、通訊、生醫、太空和其他目的的應用日漸成長，一些噪音汙染、無線電頻率干擾(RFI)、無線電輻射、電磁波干擾(EMI)問題也越來越嚴重，這些問題不僅會干擾或損壞設備，對人體健康也存在著隱憂，因此，為了不讓這些干擾日漸嚴重，研發具有電磁波遮蔽的技術或材料是相當重要的。
本研究欲將石墨烯當作導電性填料，與水溶性聚乙烯醇混摻，利用聚乙烯醇良好的成膜性質，製備出具有遮蔽電磁波性質的複合薄膜材料，製程中不使用有機溶劑，符合環保概念。此外，為了使石墨烯達到良好的分散性，利用分散劑讓石墨烯在聚乙烯醇基材中良好的分散，使複合薄膜達到更好的導電度，而具備更佳的電磁遮蔽效果。另一方面，奈米銀線導電度良好，而且穩定性好，較不容易被氧化，因此，為了使複合材料建立更佳的導電網路，本研究添加了一維奈米銀線當作複合材料的第二種填料，並將複合材料以戊二醛交聯提升耐水性，最後，在ASTM- D4935-99測試規範下，使用頻譜分析儀搭配信號產生器檢測複合薄膜電磁波遮蔽效果，得到具有電磁屏蔽性能、加工性優良，而且環保無毒的聚乙烯醇/石墨烯/奈米銀線複合薄膜。

關鍵字

石墨烯 ； 奈米銀線 ； 聚乙烯醇 ； 電磁波遮蔽

並列摘要

As electronic devices become popular in the application of military, industrial, communications, biomedical, and in space, some noise pollution, radio frequency interference (RFI), radio radiation, electromagnetic interference (EMI) problems are more serious. These problems will not only interfere with equipment but damage to human health. Therefore, in order to prevent these disturbances become more serious, developed with technology or electromagnetic shielding material is very important.
This study wishing graphene as an electrically conductive filler, blended with water soluble polyvinyl alcohol. We make use of the good film-forming properties of polyvinyl alcohol, to prepared a composite film with electromagnetic shielding properties. This process does not use organic solvent, in line with concept of environmental protection. Furthermore, in order to achieve good graphene dispersion in polyvinyl alcohol substrate, we using dispersant to disperse graphene to achieve a better degree of conductivity, and have better electromagnetic shielding effects. On the other hand, silver nanowires have well conductivity and good stability. Therefore, in order to build a better electrically conductive network, this study added silver nanowires as second filler material. We also used glutaraldehyde to crosslink PVA to enhance the water resistance of composite. Finally, at ASTM-D4935-99 test specification, using vector network analyzer to detect the electromagnetic shielding effect of composite film to give a electromagnetic shielding effect, excellent workability, and nontoxic PVA / graphene / silver nanowires composite film.

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