不同pH合成的MWCNTs-WO3复合材料的室温气敏性能  

Synthesis of multi-walled carbon nanotubes and tungsten oxide composites with different pH and gas sensitivity at room temperature

作　　者：柴丽雅[1] 李卉[1] 张国[1] 阚侃[1] 柳枝叶 史克英[1] 李丽[1,2] 

机构地区：[1]黑龙江大学化学化工与材料学院功能无机材料化学省部共建教育部重点实验室,黑龙江哈尔滨150080 [2]黑龙江大学化学化工与材料学院黑龙江省普通高等学校高效转化的化工过程与技术重点实验室,黑龙江哈尔滨150080

出　　处：《中南大学学报（自然科学版）》2014年第2期377-382,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(21076066);黑龙江省自然科学基金重点项目(ZD201002);黑龙江省自然科学基金资助项目(B201105);黑龙江省科学院青年创新基金资助项目(CX10G01);哈尔滨市科技创新人才研究专项资金资助项目(2012RFXXG102;RC2012XK018005)

摘　　要：为提高WO3的气敏性能，采用水热合成法，以钨酸钠（Na2WO4．2H2O）和多壁碳纳米管（MWCNTs）为原料，合成多壁碳纳米管与三氧化钨（MWCNTs—W03）复合材料。通过调节溶液的pH，对合成复合材料的形貌、尺寸进行控制合成，并在常温下对NO的气敏性能进行检测。研究结果表明：所得样品均为六方相W03和MWCNTs，复合材料的尺寸随着pH（pH=2～5）的增大而增加，形貌也由棒状转化为立方体状。当pH=3时，W03与MWCNTs相互结合形成网状复合材料，对NO表现出良好的气敏性能，室温条件下对体积分数为9．7×10^-5的NO灵敏度可达16．8％，具有响应时间快，选择性好的优点。For improving the gas-sensing properties of WO3, MWCNTs-WO3 composites were synthesized by hydrothermal method with multi-walled carbon nanotubes （MWCNTs） and sodium tungstate （Na2WO4·2H2O）. MWCNTs-WO3 composites show different morphologies and sizes by adjusting pH of solution. And the gas-performance of the composites to NO was studied at room temperature. The results indicate that the composite materials consist of hexagonal WO3 and MWCNTs. The sizes of the composites increase with the rise of the pH from 2 to 5, and the nanorod morphologies of the composites can be transformed into the morphologies of cubic. When the solution pH is 3, the network nanostructures are fabricated between MWCNTs and WO3. The sensitivity of the composite materials with network nanostructure demonstrate faster response and better selectivity to NO at room temperature, and the sensitivity is about 16.8 % to NO with volume fraction of 9.7 × 10-5.

关 键 词：多壁碳纳米管(MWCNTs) 三氧化钨(WO3) NO气敏性能 

分 类 号：O643.36[理学—物理化学]