本研究中，我們製備了一種輕薄可撓性雙層複合材料，利用其吸收電磁波的能力，改善無線射頻辨識(RFID)置於金屬上方失效的問題。材料選擇上，以聚二甲基矽氧烷(PDMS)為基材，利用其加工方便且易於成形的特性，透過混和三氧化二鐵(Fe2O3)以及聚四氟乙烯(PTFE)，分別製成兩種複合材料，利用Fe2O3層對電磁波的吸收，以及PTFE作為介電層，來阻絕吸收層對RFID晶片的干擾。此外我們使用化學法製備了氧化石墨烯(GO)粉末混和於Fe2O3粉末，在較低的粉末添加量上，增進其效益。電磁波進入PDMS複合材料後，首先是接觸第一層的PTFE，電磁波會受到較少的干擾進入第二層Fe2O3層，在經由Fe2O3層吸收部分電磁波的效應下，大幅減少被金屬表面反射影響的RFID訊號接收與發送，在50 wt% PTFE/PDMS複合材料加上70 wt% Fe2O3/PDMS複合材料的組合，原本被干擾的RFID晶片可由一分鐘讀取0次增強至一分鐘讀取289次。

In this work, we prepared a thin, flexible, double-layer composite material to lower the interference of the metal substrate to the radio frequency identification (RFID) placed on it through the absorption electromagnetic waves. Polydimethylsiloxane (PDMS) is used as the base material to prepare the layered composites with the structure of PTFE+PDMS/Fe2O3+PDMS. (Fe2O3+PDMS) layer is used to absorb electromagnetic waves and (PTFE+PDMS) layer is to create a gap between Fe2O3 layer and RFID tag. In addition, we used chemical methods to prepare graphene oxide (GO) powder which was mixed with Fe2O3 powder to increase the performance of the composites at a lower powder loading. While the electromagnetic wave enters the layered composite material, it contacts the first layer, that is the PTFE+PDMS layer, where the electromagnetic wave will receive less interference and enter the second layer of Fe2O3. Electromagnetic wave is partially absorbed by the second layer, as a result, reduce the intensity of the electromagnetic wave impinging on the metal surface, which increase the signal transfer between the RFID tag and reader. With the combination of 50 wt% PTFE composite material and 70 wt% Fe2O3 composite material, the originally interfered RFID chip can be enhanced to 289 reads per minute from nothing.

摘要 1
Abstract 2
致謝 3
表目錄 7
圖目錄 8
第一章 緒論 10
1.1 前言 10
1.2 研究動機 10
第二章 文獻回顧 12
2.1 電磁波干擾理論 12
2.2 電磁波屏蔽機制 13
2.2.1 反射機制 17
2.2.2 多重反射機制 18
2.2.3 吸收機制 18
2.3 三氧化二鐵 23
2.4 RFID簡介 24
第三章 實驗方法及分析 28
3.1 實驗材料及藥品 28
3.2 實驗分析儀器 29
3.2.1 場發射掃描式電子顯微鏡 29
3.2.2 X光繞射分析儀 30
3.2.3 RFID測試儀 31
3.2.4 拉曼光譜儀 31
3.2.5 向量網路分析儀 32
3.3 實驗步驟及方法 35
3.3.1 製備氧化石墨烯 35
3.3.2 製備PTFE/PDMS複合材料 35
3.3.3 製備Fe2O3/PDMS複合材料 36
3.3.4 製備GO/Fe2O3粉末 36
3.3.5 製備GO/Fe2O3/PDMS複合材料 36
第四章 結果與討論 37
4.1 表面形貌分析 37
4.1.1 Fe2O3/PDMS複合材料表面形貌分析 37
4.1.2 PTFE/PDMS複合材料表面形貌分析 39
4.1.3 Fe2O3及PTFE粉末表面形貌分析 40
4.2 X光繞射光譜分析 41
4.3拉曼光譜分析 43
4.4 RFID測試分析 45
4.5 電磁波屏蔽效能分析 47
4.5.1 介電係數與磁導率量測 47
4.5.2 電磁波屏蔽效率量測與分析 49
4.6 GO/Fe2O3/PDMS複合材料 54
第五章 結論 60
References 61

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