標題: Formation and degradation mechanism of a novel nanofibrous polyaniline
作者: Ho, Ko-Shan
Han, Yu-Kai
Tuan, Yu-Tsung
Huang, Ying-Jie
Wang, Yen-Zen
Ho, Tsung-Han
Hsieh, Tar-Hwa
Lin, Jong-Jing
Lin, Su-Chi
材料科學與工程學系奈米科技碩博班
Graduate Program of Nanotechnology , Department of Materials Science and Engineering
關鍵字: Polyaniline;Nanotube;Carbonization
公開日期: 1-Jun-2009
摘要: A nanotubular, nanofibrous polyaniline (PANINT) was prepared from an emulsion polymerization in the presence of n-dodecylbenzene sulfonic (DBSA) and hydrochloric acids. The building of the tubular structure based on the tubular micelles from the accumulation (pile up) of micelles at high surfactant concentration, leading to early stage of centipede-like and eventual tubular morphologies. The PANINT molecule owning a highly conjugated backbone demonstrated a free carrier-tail in the near-IR region due to its helical conformation. After dedoping, the once empty PANINT with only some complexed DBSA inside shrank into solid rods, after the removal of the complexed DBSA. As a result, the solid rods were filled with helical emeradine base (nano-EB) molecules associated with inter-molecular H-bonding. The solid rods of nano-EB went on crosslinking and carbonization after 200-300 degrees C by opening the quinoid rings and the inter-molecular H-bondings were destroyed with nano-EB molecules crosslinking into ladder-like structure. When temperature was over 300 degrees C and below 800 degrees C, carbonization enhanced by de-ammoniaization, causing a significant weight loss. However, the cleavage of aromatic rings into aliphatic pieces occurred after 800 degrees C, which chopped the ladder-like, strips of carbonized nano-EB sheets into small pieces of nano-particles. The conductivity of the pyrolyzed nano-EB was found to be around 10(-5) s/cm, 10,000 times higher than the neat nano-EB of 10(-9) s/cm due to the carbonization. (C) 2009 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.synthmet.2009.02.047
http://hdl.handle.net/11536/7178
ISSN: 0379-6779
DOI: 10.1016/j.synthmet.2009.02.047
期刊: SYNTHETIC METALS
Volume: 159
Issue: 12
起始頁: 1202
結束頁: 1209
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