Formaldehyde gas sensor based on SnO₂/In₂O₃ hetero-nanofibers by a modified double jets electrospinning process

详细信息	查看全文 | 推荐本文 |

• 作者：Haiying Du^a ; ^b  ; [Author Vitae] ; Jing Wang^a ; ^{wangjing@dlut.edu.cn}  ; [Author Vitae] ; Meiying Su^a  ; [Author Vitae] ; Pengjun Yao^a ; ^c  ; [Author Vitae] ; Yangong Zheng^a  ; [Author Vitae] ; Naisen Yu^d  ; [Author Vitae]
• 关键词：Gas sensor ; Hetero-nanofibers ; Electrospinning ; Double jets
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：20 May, 2012
• 卷：166-167
• 期：Complete
• 页码：746-752
• 文件大小：1104 K

摘要

SnO₂/In₂O₃ hetero-nanofibers composite was synthesized by using a modified electrospinning system with double jets of positive and negative polarity electric fields. The SnO₂/In₂O₃ hetero-nanofibers with a netted structure composed of SnO₂ and In₂O₃ nanofibers were characterized by using X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM). Both SnO₂ and In₂O₃ nanofibers were hierarchical structures with many nanocrystallites. The SnO₂ and In₂O₃ showed very different nanocrystallites sizes in the SnO₂/In₂O₃ hetero-nanofibers composite. A gas sensor was fabricated based on SnO₂/In₂O₃ hetero-nanofibers composite. The operating temperature of the gas sensor was 375 掳C. The response value of the gas sensor based on SnO₂/In₂O₃ hetero-nanofibers was higher than the ones of SnO₂ nanofibers and In₂O₃ nanofibers sensors, respectively, in formaldehyde concentration range of 0.5-50 ppm. Cross-responses of SnO₂/In₂O₃ hetero-nanofibers sensor to formaldehyde, ethanol, ammonia, acetone, toluene and methanol were tested. The response value of the SnO₂/In₂O₃ hetero-nanofibers sensor decreased when the relative humidity increased. The sensing mechanism of the SnO₂/In₂O₃ hetero-nanofibers gas sensor was briefly analyzed.