Yb-In_2O_3纳米管的制备及其对甲醛的优异气敏性能  

Fabrication and excellent formaldehyde Gas sensing properties of Yb-doped In_2O_3 nanotubes

作　　者：王雪松[1] 王国光[1] 李海英[1] 王连元[1] 刘丽[1] 郭雪馨 王晗[1] 廉红伟 

机构地区：[1]超硬材料国家重点实验室吉林大学物理学院,长春130012

出　　处：《物理学报》2016年第3期221-226,共6页Acta Physica Sinica

基　　金：吉林省科技厅重点科技攻关项目(批准号:20140204027GX)资助的课题~~

摘　　要：采用单管静电纺丝的方法成功制备了纯的与Yb掺杂的In_2O_3纳米管(Yb-In_2O_3).利用扫描电子显微镜和X射线衍射对样品的结构和形貌进行了表征,制作了基于纯In_2O_3和Yb-In_2O_3纳米管的气敏元件.研究表明,Yb-In_2O_3纳米管气敏元件在230℃下对100 ppm甲醛的灵敏度为69.8,是纯In_2O_3纳米管气敏元件对同浓度甲醛灵敏度(18.4)的3.8倍,其对100 ppm甲醛的响应恢复时间分别为4 s和84 s.并且,基于Yb-In_2O_3纳米管的气敏元件对100 ppb甲醛的灵敏度达到2.5.此外,该气敏元件还具有出色的选择性及稳定性,具备良好的实际应用前景.Pure and Yb-doped In2O3 nanotubes have been successfully fabricated by using the single-capillary electrospinning method,followed by calcination.The morphological and structural characteristics of the as-synthesized nanotubes are investigated by scanning electron microscope（SEM） and X-ray powder diffraction（XRD）.The SEM images reveal that all the pure and Yb-doped In2O3 nanotubes are distributed evenly,and the average diameter of the as-synthesized nanotubes is about 200 nm.The XRD analysis results show that the as-prepared samples are well-crystallized,and the diffraction peaks can be indexed according to cubic In2O3.Gas sensors based on pure and Yb-doped In2O3 nanotubes have been fabricated and investigated for formaldehyde detection in detail.As shown in the experimental results,Ybdoped In2O3 nanotubes exhibit enhanced formaldehyde sensing properties compared with pure In2O3 nanotubes.At the optimum operating temperature of 230℃,the response of the gas sensors based on pure In2O3 nanotubes to 100 ppm formaldehyde is 18.4,while the response of gas sensors based on Yb-doped In2O3 nanotubes is 69.8 in the same working condition,which is 3.8 times larger than that of pure In2O3 nanotubes.The improvement of Yb-doped In2O3 nanotubes gas-sensing property may be due to the formation of the heterojunction structure at the interface between the two different semiconducting oxides.The response and recovery times of Yb-doped In2O3 nanotubes to 100 ppm formaldehyde are about 4 s and 84 s respectively,indicating the fast response speed of Yb-doped In2O3 nanotubes.Moreover,even at100 ppb of formaldehyde a detectable response can be observed and the value is 2.5.The low limit of formaldehyde detection shows that the as-synthesized Yb-doped In2O3 nanotube gas sensors can be used for the detection of dilute formaldehyde.Furthermore,the Yb-doped In2O3 nanotube gas sensors have excellent selectivity towards formaldehyde.In this experiment,acetone has the highest sensitivity in a variety of common interfering gases and t

关 键 词：Yb-In2O3纳米管 甲醛 气敏元件 

分 类 号：TB383.1[一般工业技术—材料科学与工程]