Nitrogen-Rich Carbon Nitride Hollow Vessels: Synthesis, Characterization, and Their Properties
Nitrogen-Rich Carbon Nitride Hollow Vessels: Synthesis, Characterization, and Their Properties
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富氮氮化碳中空容器：合成、表征及其性能
DOI：
10.1021/jp103729c
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发表时间：
2010-07-29
影响因子：
3.3
通讯作者：
Zou, Guangtian
中科院分区：
文献类型：
--
作者：
Li, Yingai;Zhang, Jian;Zou, Guangtian
以三聚氰胺和三聚氯氰的混合物为前驱体，采用反应热解法合成了大量的富氮石墨氮化碳。扫描电子显微镜和透射电子显微镜的研究表明，微米尺寸的中空容器具有高的纵横比已成功地阐述没有设计添加任何催化剂或模板。通过燃烧法测定的所制备的氮化碳的组成为C3N4.9H1.00O0.22，其中N/C比为1.64，表明氮含量高。X射线衍射图显示石墨烯CNA的规则堆叠。单层沿着（002）方向，在a-b基面中存在C和N原子的乱层有序。X射线光电子能谱和傅里叶变换红外光谱的研究提供了进一步的证据，石墨样sp（2）键的建筑块的基础上的三嗪和庚嗪环单元桥接的3倍配位氮原子。通过紫外-可见吸收光谱和光致发光光谱对样品的光学性质进行了研究，结果表明样品具有氮原子孤对π-π * 和n-π * 电子跃迁的特征。合成的石墨化氮化碳中空容器的热重分析曲线显示了与三嗪和七嗪结构单元挥发有关的典型失重步骤。
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 C3N4.9H1.00O0.22, with the N/C ratio to be 1.64, indicating a high nitrogen content. X-ray diffraction pattern reveals the regular stacking of graphene CNA. 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 sp(2)-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 pi-pi* and n-pi* 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.