共軛高分子/奈米碳管複合物製備與性質研究

Studies on the preparation and properties of the conjugated polymer/carbon nanotube complex

鄭海佛(Hai-Fo Cheng)

指導教授 ： 廖建勛

元智大學/工程學院/化學工程與材料科學學系/碩士(2009年)

https://doi.org/10.6838/YZU.2009.00297

摘要

本研究利用簡單的改質方法，以非共價鍵結的方式將導電高分子接於多壁奈米碳管的側壁且不破壞碳管本身的結構與特性，並使其可溶於有機溶液中。本研究使用兩類的導電高分子，(一)具三種不同側鏈長度的聚（3-烷基噻吩）(二)本實驗室自行合成的聚茀三嵌段共聚體PFO-PCMS-PFO來進行改質多壁奈米碳管。本實驗分為三部份：第一部份先研究聚（3-烷基噻吩）/多壁奈米碳管複合物的性質和側鏈基的影響，第二部分為研究PCMS-PFO-PCMS/多壁奈米碳管複合物的性質，第三部分為研究機能化後PCMS-PFO-PCMS/多壁奈米碳管複合物的性質。由UV-vis、PL和Raman光譜得知導電高分子與多壁奈米碳管經π－π交互作用力鍵結複合，並且電子會在兩者間傳遞。經由UV-vis光譜和檢量線可以得知其分散的效果，當分散效果越好時，其螢光抑制效率值越大。探討溫度和溶劑力對複合物UV-vis光譜的影響，當溫度升高，無論是溶液態或是薄膜態其最大吸收波峰皆有藍移的現象，且薄膜態PCMS-PFO-PCMS/MWNT的β相也會消失。而隨不良溶劑的比例增加，其最大吸收波峰有紅移的現象，溶液態PCMS-PFO-PCMS/MWNT也會有β相生成。最後，再利用FESEM和TEM來觀察導電高分子/多壁奈米碳管複合物薄膜的表面形態和多壁奈米碳管管徑的變化，而當P3AT側鏈越長，管徑和外壁的厚度都會隨之增加。

關鍵字

聚（3-烷基噻吩）、嵌段共聚體、奈米碳管

並列摘要

A facile non-covalent modification of carbon nanotube was processed with conjugated polymers to improve the dispersion of carbon nanotube in organic solutions and to reserve its characteristic structure and properties. Two types of conjugated polymers were used, including poly(3-alkylthiophene)s (P3AT) with various alkyl side-chains and triblock copolymer of poly(9,9-dioctylfluorene) (PCMS-PFO-PCMS), to modify multi-wall carbon nanotube (MWNT). Three parts of research were performed for (1) the effect of alkyl side-chain length on the structure/properties of P3AT/MWNT complex; (2) the properties of PCMS-PFO-PCMS/MWNT complex and (3) the properties of functionalized PCMS-PFO-PCMS/MWNT complex. The results of UV-vis, PL and Raman spectra indicate that the conjugated polymers wrap on the carbon nanotubes by ?-? interaction. More conjugated polymer chains binding on the MWNT, more solution dispersion and PL quenching is attained. The increasing temperature results in the blue-shift of absorption maximum wavelength of conjugated polymers and the ? phase depression of PFO block chain segments. As the poor solvent portion increases, the absorption maximum wavelength red shifts and ? phase of PFO appears. The FESEM and TEM images reveal that the thickness of polymer wrapping on the MWNT increases with increasing side-chain length of P3ATs.

並列關鍵字

poly(3-alkylthiophene), block copolymer, carbon nanotube

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