Synthesis and Investigation of Reaction Mechanism for Carbon Nitride Having Diamond-like Properties

由于β-C_3-N_4氮化碳被认为具有金刚石般的硬度，人们在制备β-C_3-N_4氮化碳方面做了大量工作。特别地，物理方法已经用于制备，例如脉冲激光烧蚀。但是，用化学方法制备β-C_3-N_4的尝试并不多。在研究反应机理的基础上，制备了以碳和氮为主要成分的材料，用四氯化碳和氨水在1000℃下进行化学气相沉积，然后用沸水洗涤，得到乳白色白色粉末。用常规燃烧法测定了该材料的组成为<5.1>C_3N_O_H_4<0.4><4.0>，与假想的硬质材料C_3N_4的组成相似。粉体的硬度比莫氏硬度为7的石英高。ESCA C_2谱中观察到的C-N单键解释了硬度的变化<1s>。

Since carbon nitride β-C_3-N_4 was predicted to be as hard as diamond, many efforts have been made to prepare the carbon nitride. Particularly, physical methods have been used for the preparation, such as pulsed laser ablation. However, there are not so many attempts to prepare β-C_3-N_4 by chemical method. We have prepared materials containing carbon and nitrogen as main components on the basis of the reaction mechanism which we have investigated in this research.Creamy white powders were obtained by the chemical vapor deposition of carbon tetrachloride and ammonia at 1000℃, followed by washing with boiled water. The composition of the material was C_3N_<5.1>O_<0.4>H_<4.0>, which was determined by usual combustion method and was similar to that of hypothetical hard material C_3N_4. The powders were harder than quartz whose Mohs hardness is 7. The hardness could be explained by the C-N single bond observed in the ESCA C_<1s> spectrum.