### ZnO掺杂的SnO2纳米纤维的制备、表征及气敏机理

1. 1 大连理工大学电子科学与技术学院, 辽宁大连116023;
2 沈阳师范大学教育技术学院, 沈阳110000;
3 大连民族学院机电信息工程学院, 辽宁大连116600
• 收稿日期:2014-01-13 修回日期:2014-02-18 发布日期:2014-03-31
• 通讯作者: 王兢 E-mail:wangjing@dlut.edu.cn
• 基金资助:

国家自然科学基金（61176068，61131004，61001054）资助项目

### Preparation, Characterization and Gas Sensing Mechanism of ZnO-Doped SnO2 Nanofibers

TANG Wei1, WANG Jing1, YAO Peng-Jun1,2, DU Hai-Ying1,3, SUN Yan-Hui1,3

1. 1 School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning Province, P. R. China;
2 School of Educational Technology, Shenyang Normal University, Shenyang 110000, P. R. China;
3 College of Electromechanical & Information Engineering, Dalian Nationalities University, Dalian 116600, Liaoning Province, P. R. China
• Received:2014-01-13 Revised:2014-02-18 Published:2014-03-31
• Contact: WANG Jing E-mail:wangjing@dlut.edu.cn
• Supported by:

The project was supported by the National Natural Science Foundation of China (61176068, 61131004, 61001054).

Abstract:

SnO2 nanofibers were fabricated by electrospinning, using SnCl2 ·2H2O as the raw material. The influences of ZnO doping on the morphologies, structures, and compositions of the SnO2 nanofibers were studied by introducing different amounts of ZnO into the SnO2. The crystallography and microstructures of the synthesized SnO2/ZnO composite nanofibers with different molar ratios of Sn to Zn were investigated using thermogravimetric/differential thermal analysis (TG-DTA), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) spectroscopy. The obtained SnO2/ZnO composite nanofibers with different ZnO contents had hollow hierarchical structures composed of nanocrystals. Different amounts of ZnO gave different structures. The characterization results showed that the introduction of ZnO into SnO2 played an important role in the SnO2 nanofiber structure. The gas sensing properties of sensors based on different ZnO-doped SnO2 nanofibers were tested. The results indicated that the methanol-sensing performance of the sensor containing SnO2/ZnO in a molar ratio of 1:1 was better than those of the others. The sensing mechanisms of ZnO-doped SnO2 nanofibers were examined in detail. Possible reasons for the enhanced SnO2 nanofibers were fabricated by electrospinning, using SnCl2 ?2H2O as the raw material. The influences of ZnO doping on the morphologies, structures, and compositions of the SnO2 nanofibers were studied by introducing different amounts of ZnO into the SnO2. The crystallography and microstructures of the synthesized SnO2/ZnO composite nanofibers with different molar ratios of Sn to Zn were investigated using thermogravimetric/differential thermal analysis (TG-DTA), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) spectroscopy. The obtained SnO2/ZnO composite nanofibers with different ZnO contents had hollow hierarchical structures composed of nanocrystals. Different amounts of ZnO gave different structures. The characterization results showed that the introduction of ZnO into SnO2 played an important role in the SnO2 nanofiber structure. The gas sensing properties of sensors based on different ZnO-doped SnO2 nanofibers were tested. The results indicated that the methanol-sensing performance of the sensor containing SnO2/ZnO in a molar ratio of 1:1 was better than those of the others. The sensing mechanisms of ZnO-doped SnO2 nanofibers were examined in detail. Possible reasons for the enhanced

MSC2000:

• O649