多孔結構之奈米碳管/氯化鋰/聚丙烯?複合薄膜之濕度感測

Sensing of humidity by porous nanotube/LiCl/PAN composite films

陳盈字(Chen, Ying Tzu)

指導教授 ： 徐文光

國立清華大學/工學院/材料科學工程學系/碩士(2012年)

摘要

本實驗分為三個部份：一為多壁奈米碳管/氯化鋰/聚丙烯?複合材薄膜對相對濕度感測之研究；二為多孔聚丙烯?薄膜對可見光之穿透率與反射率影響；三為多孔聚丙烯?薄膜的透濕性能研究。在第一部份，相對於一般以單一複合材料製成濕度感測器，本實驗則結合奈米碳管與氯化鋰兩種導電材料，再加入聚丙烯?製作成濕度感測薄膜，實驗結果顯示確實可以改善靈敏度與準確性。在第二部份，多孔聚丙烯?薄膜於乾燥和水飽合兩種環境下，可見光範穿透率與反射率有50%~60%的明顯變化，證明多孔性材料具有光波吸收特性。在第三部份，多孔聚丙烯?薄膜確實具有透濕能力，且孔洞體積越大其透濕能力越佳。因此，視情況依比例調整奈米碳管含量可增加薄膜強度及透氣性。

關鍵字

奈米碳管 ； 氯化鋰 ； 聚丙烯? ； 濕度 ； 穿透率 ； 透氣

並列摘要

This thesis is divided into three parts. Porous thin films of multi-walled carbon nanotubes/lithium chloride/polyacrylonitrile are made and tested as sensors of humidity and experiments include the transmittance and reflectivity changes at visible light and water vapor permeability. In the 1st part, results show an improved sensitivity and accuracy compared with conventional devices made of porous polyacrylonitrile alone. In the 2nd part, the transmittance and reflectivity of porous polyacrylonitrile thin films at visible regime are verified to be 50~60% changes between dry and wetted states. In the 3th part, experimental results show the greater the pore volume of polyacrylonitrile films the better the water vapor permeability.

參考文獻

[1] X. L. Xie, Y. W Mai, X. P. Zhou, Dispersion and alignment of carbon nanotubes in polymer matrix: A review, Materials Science and Engineering R 49 (2005) 89-112.

[2] B. Sundaray, V. Subramanian, T.S. Natarajan, K. Krishnamurthy, Electrical conductivity of a single electrospun fiber of poly(methyl methacrylate) and multiwalled carbon nanotube nanocomposite, Applied Physics Letters 88 (2006) 143-114.

[3] V. N. Popov, Carbon nanotubes: properties and application, Materials Science and Engineering 43 (2004) 61-102.

[4] O.K. Varghese, P.D. Kichambre, D. Gong, K.G. Ong, E.C. Dickey, C.A. Grimes, Gas sensing characteristics of multi-wall carbon nanotubes, Sens. Actuators B 81 (1) (2001) 32–41.

[5] J. Li, Y.J. Lu, Q., Ye, M. Cinke, J. Han, M. Meyyappan, Carbon nanotube sensors for gas and organic vapor detection, Nano Lett. 3 (7) (2003) 929–933.