MWCNTs/SnO_2复合材料的制备及室温NO气敏性研究  

Preparation of Multi-Walled Carbon Nanotubes-SnO_2 composite and its gas sensor properties for NO detection at room temperature

作　　者：史克英[1] 陈垒[1,2] 李丽[1,2] 马喜强[1] 

机构地区：[1]黑龙江大学功能无机材料化学省部共建教育部重点实验室,哈尔滨150080 [2]黑龙江大学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,哈尔滨150080

出　　处：《黑龙江大学自然科学学报》2011年第4期490-497,共8页Journal of Natural Science of Heilongjiang University

基　　金：国家自然科学基金资助项目(2067602721076066);黑龙江省自然科学基金重点项目资助(ZD201002);黑龙江省教育厅2011年度科学技术研究重点项目资助(12511z024);黑龙江大学杰出青年基金资助项目(JCL201006)

摘　　要：为开发室温NO气敏传感器,采用SnCl2溶液法合成了MWCNTs/SnO2复合材料,并对复合材料进行了XRD,Raman,SEM,TEM,TG-DSC及XPS表征。结果表明：在MWCNTs/SnO2复合材料中,尺寸为5 nm左右的SnO2颗粒均匀地负载在MWCNTs表面,MWCNTs与SnO2的质量之比基本恒为3∶1,不随所加羧基化MWCNTs量的不同（30~100 mg）而变化。利用静态注气法考察的MWCNTs/SnO2复合材料室温NO气敏响应特性表明,MWCNTs/SnO2复合材料对NO的气敏响应有了较大的提高,对100×10-6NO的响应值大约是MWCNTs的4倍。将纳米SnO2负载在MWCNTs的表面之所以能够明显提高MWCNTs的室温NO响应值,是由于复合材料吸附NO分子时电子由p型半导体MWCNTs向SnO2转移的结果。In order to develop NO gas sensor working at room temperature, Multi -Walled Carbon Nanotubes （MWCNTs） and SnO2 composite was synthesized by SnCl2 solution method, and the composite was characterized by XRD, Raman, SEM, TEM, TG - DSC and XPS methods. It was observed that SnO2 nanoparticles of only 5 nm were deposited uniformly on the surface of MWCNTs in the MWCNTs/SnO2 composite. The weight ratio of MWC- NTs to SnO2 in the composite was kept 3：1 though different amount of carboxylated MWCNTs （30 - 100 mg） was used in the synthesis process. The NO response property of MWCNTs/SnO2 composite was investigated at room temperature by static testing. It was shown that the MWCNTs/SnO2 sensor＇s response has increased by a factor of four in comparison with that of MWCNTs toward 100 × 10 ^-6 NO. Therefore, modification of SnO2 nanoparticles on the surface of MWCNTs could improve significantly the response of MWCNTs toward NO at room temperature. This was because the electrons transferred from p -type MWCNTs to SnO2 when NO molecules were adsorbed on the MWC- NTs/SnO2 composite.

关 键 词：多壁碳纳米管 SNO2 NO 室温 气敏材料 

分 类 号：O643.364[理学—物理化学]