Department of Chemistry
Controllable and large-scale synthesis of metal-free carbon nanofibers and carbon nanocoils over water-soluble NaxKy catalysts
Through the pyrolysis of acetylene at 450 °C, large quantities of carbon nanocoils or carbon nanofibers can be synthesized selectively by controlling the Na:K molar ratio of water-soluble NaxKy catalysts. We found that the temperature adopted for pyrolysis is an important factor for selectively obtaining the different kinds of products. Because the NaxKy catalysts are water-soluble, they can be easily removed, and the nanocarbon materials can be harvested undamaged in high purity. The process is simple, inexpensive, and environment-benign, giving a product yield matching those of the transition-metal catalysts. Based on the results, we conducted discussion on the role of catalyst, effect of pyrolysis temperature, and formation mechanism of the nanomaterials. © 2011 Elsevier Ltd. All rights reserved.
Source Publication Title
Qi, Xiaosi, Wei Zhong, Xiujuan Yao, Han Zhang, Qian Ding, Qiong Wu, Yu Deng, Chaktong Au, and Youwei Du. "Controllable and large-scale synthesis of metal-free carbon nanofibers and carbon nanocoils over water-soluble NaxKy catalysts." Carbon 50.2 (2012): 646-658.