Carbonization Mechanism of Tetrapropylammonium-hydroxide in Channels of AlPO4-5 Single Crystals
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- 作者：Jian Pang Zhai ; Zi Kang Tang ; Zhao Ming Li ; Irene Ling Li ; Fu Yi Jiang ; Ping Sheng ; and Xijun Hu
- 刊名：Chemistry of Materials
- 出版年：2006
- 出版时间：March 21, 2006
- 年：2006
- 卷：18
- 期：6
- 页码：1505 - 1511
- 全文大小：246K
- 年卷期：v.18,no.6(March 21, 2006)
- ISSN：1520-5002
文摘
We studied the carbonization mechanism of tetrapropylammonium-hydroxide (TPAOH) carbonprecursors in the channels of AlPO4-5 crystal, with the aim of producing higher-density and better-quality 4 Å carbon nanotubes. The conversion process of TPAOH was investigated by using a combinationof Fourier transform infrared (FTIR) spectra, mass spectrometry, and micro-Raman spectroscopy undervarious pyrolysis temperatures. During the pyrolysis process, the TPAOH molecules decomposed intolighter amines with the abstraction of propylene, with the stepwise formation of tripropylamine,dipropylamine, and n-propylamine. This leads to the formation of 0.4 nm single-walled carbon nanotubes(SWNTs) at about 723 K. The SWNTs density was found to be higher than that resulting from thecarbon precursor of tripropylamine (TPA), because of the larger number of carbon atoms in the unit cell.Thermogravimetry (TG) measurements also indicated a higher loading density (in AlPO4-5 crystals) forthe TPAOH carbon precursors.