title: Large-scale and controllable synthesis of metal-free nitrogen-doped carbon nanofibers and nanocoils over water-soluble Na2CO3.
abstract: Using acetylene as carbon source, ammonia as nitrogen source, and Na2CO3 powder as catalyst, we synthesized nitrogen-doped carbon nanofibers (N-CNFs) and carbon nanocoils (N-CNCs) selectively at 450°C and 500°C, respectively. The water-soluble Na2CO3 is removed through simple washing with water and the nitrogen-doped carbon nanomaterials can be collected in high purity. The approach is simple, inexpensive, and environment-benign; it can be used for controlled production of N-CNFs or N-CNCs. We report the role of catalyst, the effect of pyrolysis temperature, and the photoluminescence properties of the as-harvested N-CNFs and N-CNCs.
authors.forename: Qian
authors.initials: Q
authors.lastname: Ding
authors.forename: Xueyin
authors.initials: X
authors.lastname: Song
authors.forename: Xiujuan
authors.initials: X
authors.lastname: Yao
authors.forename: Xiaosi
authors.initials: X
authors.lastname: Qi
authors.forename: Chak-Tong
authors.initials: CT
authors.lastname: Au
authors.affiliation: Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing 210093, People's Republic of China. wzhong@nju.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhong
authors.forename: Youwei
authors.initials: Y
authors.lastname: Du