碳氮纳米结构材料的Raman和XPS分析

利用等离子体增强热丝化学气相沉积在不同条件下制备了不同结构的碳氮纳米结构材料。用扫描电子显微镜(SEM)、显微Raman光谱仪和X射线光电子谱(XPS)仪对它们的形貌和结构进行了分析。SEM照片表明在不同的生长条件下可制备出碳氮纳米尖锥、碳氮柱。Raman谱中位于1350和1607cm-1的D和G峰,表明制备的碳氮纳米结构材料主要由sp2碳组成。根据D和G峰的强度比,估计的sp2碳颗粒为4nm。XPS谱在398.4eV处显示出与氮有关的峰,表明制备的碳氮纳米结构材料中含有氮。对N1sXPS谱的峰进行拟合后,发现位于398.4eV的峰由位于398.3和约400.0eV的两个峰组成,分别与sp3和sp2 C—N键有关,表明材料中的部分碳原子被氮原子所替代。

Raman and XPS analyses of carbon nitride nanostructure materials

Carbon nitride nanostructure materials with different structures were prepared by plasma-enhanced hot filament chemical vapor deposition under different conditions.Their structures were analyzed by scanning electron microscopy(SEM),micro-Raman spectroscopy and X-ray photoelectron spectroscopy(XPS),respectively.The SEM images show that carbon nitride nanotips,cones and fibers can be formed under different growth conditions.Raman spectra exhibit the D and G peaks at about 1350 and 1607cm-1,which indicates that the prepared materials are mainly composed of sp2 carbon.According to the intensity ratio of D to G peak,the sp2 carbon clusters are estimated to be about 4nm.Each XPS spectrum shows a peak related to nitrogen at 398.4eV,which illustrates that nitrogen is incorporated into the prepared materials.After the N1s XPS spectra were fitted,it was found that each fitting peak was composed of two peaks at about 398.3 and 400.0eV.The two peaks are related to sp3 and sp2 C—N bonds,respectively,which indicates that the carbon atoms in the materials are partically replaced by nitrogen atoms.