Nitrogen-Rich Carbon Nitride Hollow Vessels: Synthesis, Characterization, and Their Properties

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• 作者：Yingai Li ; Jian Zhang ; Qiushi Wang ; Yunxia Jin ; Dahai Huang ; Qiliang Cui ; Guangtian Zou
• 刊名：Journal of Physical Chemistry B
• 出版年：2010
• 出版时间：July 29, 2010
• 年：2010
• 卷：114
• 期：29
• 页码：9429-9434
• 全文大小：303K
• 年卷期：v.114,no.29(July 29, 2010)
• ISSN：1520-5207

文摘

Bulk quantities of nitrogen-rich graphitic carbon nitride are synthesized via a facile reactive pyrolysis process with a mixture of melamine and cyanuric chloride as the molecular precursors. Scanning electron microscopy and transmission electron microscopy studies show that micrometer-sized hollow vessels with high aspect ratios have been successfully elaborated without the designed addition of any catalyst or template. The composition of the prepared carbon nitride determined by combustion method is C₃N_4.91H_1.00O_0.22, with the N/C ratio to be 1.64, indicating a high nitrogen content. X-ray diffraction pattern reveals the regular stacking of graphene CN_x monolayers along the (002) direction with the presence of turbostratic ordering of C and N atoms in the a−b basal planes. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy investigations provide further evidence for graphite-like sp²-bonded building blocks based on both triazine and heptazine ring units bridged by 3-fold coordinated nitrogen atoms. The optical properties of the sample are investigated by UV−vis absorption and photoluminescence spectroscopy, which show features characteristic of π−π* and n−π* electronic transitions involving lone pairs of nitrogen atoms. Thermogravimetric analysis curves of the synthesized graphitic carbon nitride hollow vessels show typical weight loss steps related to the volatilization of triazine and heptazine structural units.