激光照射石墨悬浮液制备纳米金刚石的研究  

Synthesis of diamond nanocrystals by pulsed-laser irradiation

作　　者：孙景[1] 翟琪[1] 江雷[1] 雷贻文[1] 杨星[1] 杜希文[1] 

机构地区：[1]天津大学材料学院,天津300072

出　　处：《金刚石与磨料磨具工程》2006年第5期24-27,共4页Diamond & Abrasives Engineering

基　　金：国家自然科学基金项目资助(编号:50372043);天津市科技攻关培育项目资助(编号:043101211)

摘　　要：本文研究了一种用激光合成纳光金刚石的新方法。利用Nd:YAG脉冲激光照射循环流动的石墨悬浮液成功制备了纳米金刚石。与以往激光合成纳米金刚石方法相比,具有激光功率密度低(106W/cm2)、效率高的特点。利用高分辨透射电子显微镜(HRTEM)分析了分别以炭黑、石墨为原料的不同实验产物的微观组织结构,在此基础上讨论了此方法的反应机理。研究结果表明:该方法制备的金刚石为立方结构,晶粒尺寸约为5nm,其相变路径为:由菱方石墨向立方金刚石的直接转变或六方石墨过渡到菱方石墨并最终形成立方金刚石的间接转变。Diamond nanocrystals were prepared in circular graphite suspension by Nd：YAG pulsed laser irradiation, which was a continuous, controllable and efficient method. The products after laser irradiation were characterized by High Resolution Transmission Electron Microscopy （HRTEM）, and the results showed that nanocryatalline cubic diamond was obtained and the grain size was about 5nm. The phase transformation mechanism was discussed. The phase transformation paths were revealed to be direct transformation from rhombohedral graphite to cubic diamond, or indirect transformation from hexagonal graphite to rhombohedral graphite at first and then to cubic diamond.

关 键 词：脉冲激光 石墨 金刚石 纳米晶 

分 类 号：TQ164[化学工程—高温制品工业]