Preparation of Carbon Nanotube with Small Diameters Using Co-Mo/MgO as Catalyst
-
摘要: 用柠檬酸络合法制备催化剂Co-Mo/MgO,以CH4为碳源,采用催化化学气相淀积法制备小管径碳纳米管.通过调整反应气氛和温度,优化反应条件.所得碳纳米管形貌分别用透射电子显微镜和高分辨透射电子显微镜表征.研究结果表明,当反应温度为950℃,H2,N2和CH4的流量分别为200,200和50 mL/min时,可以获得管径约为10 nm的小管径碳纳米管,产率达110%以上.Abstract: Carbon nanotubes(CNTs) with small diameters were prepared by catalytic chemical vapor deposition using Co-Mo/MgO as the catalyst and CH4 as the carbon source.The catalyst was prepared by citric acid complexation.The reaction atmosphere and temperature were studied deliberately to optimize the procedure.The morphologies of the obtained CNTs were characterized by transmission electron microscopy and high-resolution transmission electron microscopy.The CNTs with diameters about 10 nm were obtained with a yield over 110% when the reaction temperature was 950℃,the gas flow rates of H2,N2 and CH4 were 200,200 and 50 mL/min,respectively.
-
Key words:
- carbon nanotube /
- catalyst /
- Co-Mo /
- yield /
- optimization
-
DRESSELHAUS M S,DRESSELHAUS G,SAITO R.Physics of carbon nanotubos[J].Carbon,1995,37(7):883-891.[2] BAUGHMAN R H,ZAKHIDOV A A,de HEER W A.Carbon nanotubos--the route toward applications[J].Science,2002,297(5 582):787-792.[3] DEKKER C.Carbon nanotubes as molecular quantum wires[J].Phys.Today,1999,52(5):22-28.[4] FENNIMORE A M,YUZVINSKY T D,HAN W Q,et al.Rotational actuators based on carbon nanotubes[J].Nature,2003,424(6 947):408-410.[5] ODOM T W,HUANG J L,KIM P,et al.Atomic structure and electronic properties of single-walled carbon nanotubes[J].Nature,1998,391(6 662):62-64.[6] SAITO R,FUJITA M,DRESSELHAUS G,et al.Electronic structure of chiral graphene tubules[J].Appl.Phys.Lett.,1992,60(18):2 204-2 206.[7] REICH S,THOMSEN C,MAULTZSCH J.Carbon nanotubos:basic concepts and physical propertles[M].Berlin:Wiley-VCH,2004:34-114.[8] 江奇,刘宝春,瞿美臻,等.多壁碳纳米管结构与其电化学容量之间关系的研究[J].化学学报,2002,60(8):1539-1542.JIANG Qi,LIU Baochun,QU Meizhen,et al.A study on relations between structure and electrochemical capacitance of multi-walled carbon nanotubes[J].Acta Chimica Sinica,2002,60(8):1539-1542.[9] 付小娟,张海燕,周纯,等.不同管径碳纳米管电化学储氢性能的比较[J].材料导报,2005,19(10):117-120.FU Xiaojuan,ZHANG Haiyan,ZHOU Chan,et al.The comparison of electrochemical hydrogen storage abilities of CNTs with different tube diameters[J].Materials Review,2005,19(10):117-120.[10] 张登松,代凯,方建慧,等.多壁纳米碳管电极电吸附脱盐性能的研究[J].功能材料,2005,36(2):282-284.ZHANG Dengsong,DM Kai,FANG Jianhui,et al.Study on the electric adsarptian-desalination with multiwall carbon nanetubes electrode[J].Journal of Functional Materials,2005,36(2):282-284.[11] 邵玉艳,尹鸽平,高云智,等.不同直径碳纳米管的抗电化学氧化性[J].电化学,2006,12(3):288-291.SHAO Yuyan,YIN Geping,GAO Yunzhi,et al.Investigation on the resistance to electrochemical oxidation of carbon nanotubos with various diameters[J].Electrochemistry,2006,12(3):288-291.[12] 韩向宇,胡陈果,奚伊,等.管径相关的多壁碳纳米管膜的压阻效应[J].功能材料,2007,38(2):323-325.HAN Xiangyu,HU Cbonguo,XI Yi,et al.Diameter-dependent piezoresistive effect of multi-walled carbon nanotubo films[J].Journal of Functional Materials,2007,38(2):323-325.[13] BRANIMIR L,JIN W S,REVATHL R B,et al.Catalytically growth carbon nanotubes of small diameter have a high Young's modulus[J].Nano.Lett.,2005,5(10):2 074-2 077.[14] CHAI S P,ZEIN S H S,MOHAMED A R.The effect of catalyst calcination temperature on the diameter of carbonnanotubes synthesized by the decomposition of methane[J].Carbon,2007,45(7):1535-1541.[15] CHAI S P,ZEIN S H S,MOHAMED A R.The effect of reduction temperature on Co-Mo/Al2O3 catalysts for carbon nanctubes formation[J].Applied Catalysis A:General,2007,326(2):173-179.[16] 王红娟,彭峰,黎志欣,等.Fe-Mo/MgO催化剂CVD法制备碳纳米管[J].化学反应工程与工艺,2005,21(1):76-80.WANG Hongjuan,PENG Feng,LI Zhixin,et al.Preparation of carbon nanotube by CVD method with Fe-Mo/MgO catalyst[J].Chemical Rcactinn Engineering and Technology,2005,21 (1):76-80.[17] IVANOV V,FONSECA A,NAGY J B,et al.Catalytic production and purification of nanotubules having fullerene-scale diameters[J].Carbon,1995,33(12):1 727-1 738.
点击查看大图
计量
- 文章访问数: 1658
- HTML全文浏览量: 73
- PDF下载量: 439
- 被引次数: 0