连续法制备羟基化碳纳米管/氧化铁复合粒子研究  

Preparation of hydroxylated carbon nanotubes/ferric oxide compound particles by continious process

作　　者：李勇波[1] 马传国[1] 李欣欣[1] 万华妹[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《无机盐工业》2013年第8期8-11,共4页Inorganic Chemicals Industry

基　　金：国家自然科学青年基金(50903022)

摘　　要：首先采用Fenton试剂对碳纳米管(CNTs)进行羟基化处理,再分别用氨水、碳酸钠和尿素作沉淀剂直接将处理得到的母液中的Fe3+转变为氧化铁(Fe2O3)的前驱体,经350℃煅烧后得到了不同的羟基化CNTs/氧化铁复合粒子。利用SEM、TG-DSC以及XRD对不同复合粒子的形貌、热分解机理以及物相进行表征,并比较了它们的导电性。结果发现,3种沉淀剂沉淀得到的复合粒子中Fe2O3的纯度高、晶型完整,其中氨水法制得了晶粒尺寸为36.9 nm的α-Fe2O3,有一定程度的团聚现象,体积电阻率为4.8×105Ω.cm;碳酸钠法制得了晶粒尺寸为28 nm的γ-Fe2O3,团聚现象严重,体积电阻率为5.1×105Ω.cm;尿素法制得了晶粒尺寸为50.3 nm的α-Fe2O3,粒子分散均匀,体积电阻率为100Ω.cm。Carbon nanotubes （CNTs）were firstly hydroxylated with Fenton reagent.Then the Fe^3＋ in the obtained mother liquor was directly converted into the precursor of ferric oxide （Fe2O3） with ammonia, sodium carbonate, and urea as precipi- tants, respectively.Different hydroxylated CNTs/Fe2O3 compound particles were finally obtained after calcined at 350℃.The morphology,thermal decomposition mechanism,and phase structure of the compound particles were characterized by SEM, TG-DSC, and XRD, respectively.In addition, their electrical conduetivities were also investigated.Results showed that Fe2O3 in those compound particles had high purity and integrated crystalline structure; for ammonia precipitant, the α-Fe2O3 particles with crystallite size of 36.9 nm were obtained, and the compound particles were agglomerated to some certain extent with volume resistivity of 4.8×10^5Ω·cm;for sodium carbonate precipitant,γ-Fe2O3 particles with crystallite size of 28 nm were obtained, and the compound particles were drastically agglomerated with volume resistivity of 5.1 × 10^5 Ω· cm ; for urea precipitant, α-Fe2O3 with crystallite size of 50.3 nm was obtained,and the compound particles were homogeneous with volume resistivitv of 100 Ω·cm.

关 键 词：碳纳米管 羟基化 氧化铁 复合物 

分 类 号：TQ138.11[化学工程—无机化工]