奈米碳管叢熱電效應之研究

Thermoelectric property of vertically aligned carbon nanotube carpets

廖彥霖(Yang-Lin Liao)

指導教授 ： 張所鋐

共同指導教授 ： 蘇志中(Chih-Chung Su)

國立臺灣大學/工學院/機械工程學研究所/碩士(2014年)

https://doi.org/10.6342/NTU.2014.01740

摘要

熱電材料需具備良好的導電性、極小的熱傳導係數與高的賽貝克係數，奈米碳管擁有相當優異的電性質、機械性質與熱性質，相較於傳統熱電材料，奈米碳管還有製備方便與價格低廉等優點，雖然奈米碳管在微小尺度下熱傳導係數極大，但隨著奈米碳管數量增加，其熱傳導係數將會急遽下降，且排列方式也會影響熱傳導，近來許多研究中將奈米碳管用來控制元件內的熱傳導，其中不乏熱電材料以添加奈米碳管的方式來增加熱電性質。

本研究以化學氣相沉積法合成垂直陣列無填鐵奈米碳管叢與填鐵奈米碳管叢，從巨觀的角度下探討其基礎熱電性質，實驗結果發現，填鐵奈米碳管叢製程中添加催化劑二茂鐵的方式不僅可以控制層數與厚度，當填鐵奈米碳管層數越少時，其熱電性質則越佳，單層之填鐵奈米碳管叢的賽貝克係數在 時約為-65 ，其值約為無填鐵奈米碳管叢之兩倍，本研究更透過蒸鍍碲化鉍與碲化銻的方式，使得奈米碳管的熱電性質得以增加，其中單層填鐵奈米碳管在 時增加幅度更來到2.67倍。

關鍵字

垂直陣列奈米碳管叢 ； 熱電性質 ； 賽貝克係數 ； 熱傳導係數

並列摘要

Thermoelectric material need to have high electrical conductivity, low thermal conductivity and high Seebeck coefficient. Carbon nanotubes have very excellent electrical properties, mechanical properties and thermal property. Compared to conventional thermoelectric materials, convenient and inexpensive preparation of carbon nanotubes. In the micro-scale, the thermal conductivity of carbon nanotubes is great, but the increase in the number of carbon nanotubes will drop dramatically. Recently, many studies have used carbon nanotubes to control the heat transfer of electronic components. Some of thermoelectric materials add to increase the
thermoelectric property of carbon nanotubes.
In this study, the growth of vertically aligned carbon nanotubes using chemical deposition method. Explore the basis of thermoelectric properties of carbon nanotubes from macro. From the experimental results showed that fewer layers of iron-filled carbon nanotubes have the better thermoelectric property. The Seebeck coefficient of single layer iron-filled carbon nanotube forest is -65 at , which is 2 times of carbon nanotube forest. Vapor deposition was used to deposit bismuth (III) telluride and antimony (III) telluride onto carbon nanotube forest. The thermoelectric properties were improved by increasing the Seebeck coefficient values. At , the Seebeck coefficient of the single layer iron-filled carbon nanotube forest increased 2.67 times.

並列關鍵字

iron-filled CNTs ； Seebeck coefficient ； thermoelectric ； thermal conductivity

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