以K_2CO_3为催化剂气相沉积纳米碳纤维  

Study on Synthesis of Carbon Nanofibers by Chemical Vapor Deposition Using K_2CO_3 Catalyst

作　　者：张金云[1] 张永恒[1] 

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2009年第4期292-296,共5页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(50742006);山东省教育厅科技项目(J07YA13-2);教育部博士点基金项目(20070426002);青岛科技计划项目(08-1-3-16-JCH)

摘　　要：气相制备纳米碳纤维目前所用的催化剂多为过渡金属Fe、Co、Ni及其合金,这些金属的引入使得纳米碳纤维的提纯必须用强酸,这一过程不但对设备要求较高,且杂质不易除净。本研究采用由前驱体法和微乳液法制备的水溶性碱金属K2CO3为催化剂、乙炔为碳源在不同温度下气相沉积纳米碳纤维。结果表明,前驱体法制备的K2CO3催化剂比微乳液法制备的K2CO3催化剂沉积纳米碳纤维产率要高很多(600℃时,产率高13倍),600℃是较佳的沉积温度,并且得出600℃适合螺旋形纤维的生长,而700℃适合线形纤维的生长。Most catalysts in preparing carbon nanofibers by chemical vapor deposition are transition metals such as Fe, Co and Ni. However, strong acids must be used to purify the products. This process requires high-level equipments and part of impurities can not be removed easily. In this study, carbon nanofibers were obtained, by chemical vapor depostiton using water-soluble K2CO3 as catalyst, which were obtained by two methods. precursor and micro-emulsion, using acetylene （C2H2） gas as carbon resource. The results showed that the precursor method was better to synthesize the carbon nanofibers and 600℃ is the optimal temperature, under which helical carbon nanofihers were obtained. Under 700℃, linear carbon nanofibers were obtained.

关 键 词：水溶性催化剂 K2CO3 纳米碳纤维 纳米结构 

分 类 号：TB383[一般工业技术—材料科学与工程]