鈷和氧化銅多層摻雜以及單層氧化鐵摻雜奈米碳紙其微波吸收研究

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Title:	鈷和氧化銅多層摻雜以及單層氧化鐵摻雜奈米碳紙其微波吸收研究
Other Titles:	The study of microwave absorption properties of Co/CuO doped multilayer buckypaper and Fe3O4 doped buckypaper
Authors:	江哲瑋 Chiang,Che Wei
Contributors:	劉日新 Jih-Hsin Liu 電機工程學系
Keywords:	同軸量測;奈米碳管紙;奈米碳管;微波吸收 coaxial measurement;carbon nanotube paper;carbon nanotubes, , ,;microwave absorption
Date:	2015
Issue Date:	2015-12-22T06:18:43Z (UTC)
Abstract:	自1991年奈米碳管被發現後，其力學、光學、電學及磁特性優異的特性使得近年來成為很熱門的研究方向，由於奈米碳管體積極小，因此在現實生活中很少被實際應用。為了使我們能夠在巨觀下研究奈米碳管，本實驗利用真空過濾法將奈米碳管製作成水溶液，之後過濾成一片奈米碳管紙，稱巴克紙(buckypaper，BP)。本實驗使用鈷、氧化銅、氧化鐵等奈米粉體以摻雜比例10%、30%、50%改質巴克紙，並使用鈷及氧化銅摻雜製作分層巴克紙，最後利用同軸量測法測量不同摻雜比例及不同分層之巴克紙之微波特性，同時測量磁滯曲線觀察巴克紙在經過改質後磁性的變化。實驗結果可以看出巴克紙在經過摻雜之後會出現傳輸損耗降低及反射損耗下降的趨勢，但是在摻雜氧化鐵時則是在摻雜超過30%後，傳輸損耗及反射損耗出現上升的趨勢，傳輸損耗最大達-11.21dB，同時吸收損耗出現寬頻吸收的特性；在分層巴克紙量測結果可看出，分層排列不同可以改變微波特性，如分層E在16GHz頻率時會產生共振使吸收損耗增加，改變分層排列也能增加吸收頻寬。實驗最後將純巴克紙製作簡易吸波貼片覆蓋於天線上，進行天線場型量測，量測結果可由場型圖看出，在未放上巴克紙時場型圖呈現出完整圓形，放上巴克紙後場型圖出現明顯凹陷，由此證明巴克紙在吸波貼片應用是可行的，未來可藉此發展輕薄具可撓性之吸波貼片。 Since carbon nanotubes were discovered in 1991, its mechanical, optical, electrical and magnetic properties of excellent features that make in recent years become a very popular research direction, due to the small volume of carbon nanotubes, it is rarely a practical application in real life.To enable us study the nanotubes at the macroscopic level, the sample was made by the aqueous solution of CNTs and the filtration method to make it into a paper like structure called as Bucky paper (BP).In this investigation, we first mixed nano cobalt (Co), or copper oxide (CuO) or iron oxide (Fe3O4) powders in different weighting percentage into BP and then we make multilayer BP by mixing it with cobalt and copper oxide powers alternately. Finally we use the coaxial method to measure the RF absorption characteristics in different percentage and different layer configuration of doped Bucky papers. At the same time the hysteresis curves were also observed after the changes of magnetic behavior.The results show that Bucky paper reduce transmission loss and return loss after a downward trend in doped samples, but when doping iron oxide was more than 30%, the transmission loss and return loss got upward trend, the transmission loss of went upward -11.21dB, and found the absorption loss had broadband absorption characteristic. In multilayer Bucky paper measurement results demonstrate that you can change the layered arrangement to make different microwave characteristics. For example the sample E will resonate so as to increase absorption loss at 16GHz. To change layered arrangement can also increase the absorption bandwidth.Finally, we used Bucky paper to make a simple absorbing patch. The samples were covered on an antenna and to measure antenna field chart. The measurement results can be seen in antenna field chart, the field chart diagram showed a perfect circle without covering an absorbing material. But the EM field became suppression with a magnetic doped BP patch. Thus this proved that a Bucky paper absorbing patch is feasible, thereby to make a light and flexible absorbing material by modified BP will be applicable in the future.
Appears in Collections:	[Department of Electrical Engineering ] Master's Theses

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