物理学报Issue(4)：048101-1-048101-6,6.DOI:10.7498/aps.63.048101
氮氢共掺杂金刚石中氢的典型红外特征峰的表征
Characterization of typical infrared characteristic p eaks of hydrogen in nitrogen and hydrogen co-dop ed diamond crystals
摘要
Abstract
The 3107 cm-1 peak is observed in the infrared absorption spectra of all types of Ia diamonds, but it has not been observed in the iron-based catalyst. A series of nitrogen and hydrogen-doped diamond crystals is successfully synthesized using P3N5 as the nitrogen source in a catalyst-carbon system at a lower pressure and temperature (6.3 GPa, 1500 ◦C). Fourier transform infrared micro-spectroscopy reveals that the hydrogen atoms existing in the synthesized diamond are in two forms. The one is attributed to the C-H bond stretching (3107 cm-1) and bending (1405 cm-1) vibrations of the vinylidene group (> C=CH2). The other is due to sp3 hybridization C-H bond symmetric (2850 cm-1) and anti-symmetric (2920 cm-1) vibrations. According to our result, we find that the 3107 cm-1 hydrogen absorption peak is related to the aggregated nitrogen in synthetic diamond. The 3107 cm-1 peak could not be observed in synthetic diamond without aggregated nitrogen, even if it has a high nitrogen concentration. And the hydrogen absorption peaks at 2920 and 2850 cm-1 are more widespread than the absorption peak at 3107 cm-1, this suggests that the sp3 C-H bond more widely exists in diamond than the vinylidene group (>C=CH2). Infrared spectra analysis indicates that the hydrogen impurity mainly exists in the natural diamond as vinylidene group as seen from the absorption peak intensity. We believe that our results provide a new way to study the formation mechanism of the natural diamond. Moreover, the ideal synthesis condition in our system supplies a possible way for us to design n-type diamond semiconductor.关键词
金刚石/氮氢共掺杂/红外光谱Key words
diamond/nitrogen and hydrogen co-doped diamond crystals/Fourier transform infrared spectra引用本文复制引用
颜丙敏,贾晓鹏,秦杰明,孙士帅,周振翔,房超,马红安..氮氢共掺杂金刚石中氢的典型红外特征峰的表征[J].物理学报,2014,(4):048101-1-048101-6,6.基金项目
国家自然科学基金(批准号:51172089)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.51172089) （批准号:51172089）
