【摘要】 采用催化化学气相沉积法(CCVD)制备了洋葱状富勒烯 (OFs),借助高分辨透射电镜 (HRTEM)观察和分析了其形貌结构。结果发现,以负载Co2+的Y型沸石为催化剂,C2H2为碳源,反应温度为 700℃时,单位催化剂产炭率的质量分数为 66%,其中洋葱状富勒烯的收率可达产炭率体积分数的 20%以上;并认为OFs的生长机理为由内到外逐层石墨化的气固(VS)模式。更多还原

【Abstract】 Onion-like fullerenes （OFs） were prepared by catalytic chemical vapor deposition （CCVD）, and their morphologies and microstructure were characterized by high resolution transmission electron microscope. Results show that OFs can be obtained under the conditions where Co⁺² supported by the zeolite （NaY） was used as catalyst, and acetylene was used as carbonaceous gas with the reaction temperature controlled at 700℃. The carbon yield per weight of catalyst can reach 60% and the portion of OFs can reach above 20%. From their vapor-solid formation pattern it is speculated, that graphitization occurs in successive stages from the core to the surface.更多还原