順向多壁碳管之電場感應研究

Use of aligned carbon nanotubes as electric field sensors

呂杰璉(Chieh-Lien Lu)

指導教授 ： 徐文光

國立清華大學/工學院/材料科學工程學系/博士(2013年)

https://doi.org/10.6843/NTHU.2013.00485

摘要

本篇文章是利用往同一方向生長並有序排列的多壁奈米碳管製成電場感測器，並且利用模擬軟體探討其運作的機制。實驗中發現碳管受電場影響後電阻值會立刻產生變化，並且產生大幅度的震盪。在低溫真空環境下碳管產生的電阻變化可以達到最大化。由於本實驗的運作原理跟奈米碳管傾向叢聚(aggregate)有關，所以本篇亦針對碳管的叢聚行為做探討。
第一章 簡短地敘述論文背景與動機
第二章 簡述奈米碳管的基本性質、現今電場感測器的優缺點，以及理論模擬之發展與原理
第三章 介紹實驗儀器、實驗流程與儀器裝置的設定
第四章 探討碳管受電場影響後的電性變化，發現當0.06mV/Å的電場做用在碳管上時，會使碳管產生極化，讓整個試片的電阻產生變化；並以實驗證明之。同時也討論在真空、低溫下的電阻變化。最後，我們討論了碳管叢聚成一束碳管束的機制
第五章 對整個實驗結果做一個總結

關鍵字

Carbon nanotubes ； Electric Field ； Simulation

並列摘要

Application of electric field in normal to aligned carbon nanotubes creates Coulomb forces at intertube junctions and tubes become closely packed. Packed structure facilitates intertube transfer of carriers and reduced resistance is found to scale with field strength. Aggregated nanotubes are therefore used as field sensors and sensitivity is evident by drastic fluctuations of resistance. Sensing mechanism is discussed and verified.
Chapter 1 describes the background and motivation of the thesis
Chapter 2 introduces the background of the carbon nanotubes, electric field sensors, and the simulation system.
Chapter 3 describes experimental setups and characterization techniques.
Chapter 4 discusses the sensing results of electric field by aligned carbon nanotubes and the aggregation behavior of the carbon nanotubes.
Chapter 5 concludes the experimental results.

參考文獻

1. Dekker, C., Carbon Nanotubes as Molecular Quantum Wires. Physics Today, 1999. 52(5): p. 22-28.

2. Ebbesen, T.W., et al., Electrical conductivity of individual carbon nanotubes. Nature, 1996. 382: p. 54-56.

3. Farajian, A.A., et al., Electronic transport through bent carbon nanotubes: Nanoelectromechanical sensors and switches. Physical Review B, 2003. 67(20): p. 205423.

4. Appenzeller, J., et al., Field-Modulated Carrier Transport in Carbon Nanotube Transistors. Physical Review Letters, 2002. 89(12): p. 126801.

5. Li, H.-C., et al., Conductivity enhancement of carbon nanotube composites by electrolyte addition. Applied Physics Letters, 2008. 93(3): p. 033104-3.