摘要
采用同轴静电纺丝技术制备了SnO2-CuO复合纳米纤维,采用提拉法将SnO2-CuO纳米纤维涂覆于印有梳状Au电极的氧化铝陶瓷管表面形成敏感薄膜,设计了一种新型薄膜式H2S传感器。采用X射线衍射、扫描电子显微镜和X-射线光电子能谱（XPS）表征SnO2-CuO纳米纤维的相组成和微观形貌,分析了敏感薄膜成分配比和厚度对硫化氢敏感机理和电化学特性。采用WS-30A型气敏元件分析仪测试了H2S传感器敏感特性、温度特性、湿度特性、动态响应、抗干扰特性和稳定性。结果表明,以C50纳米纤维为敏感薄膜（膜厚为70 nm）的H2S传感器,在温度为25℃,H2S气体浓度为10~60 mg/L时,传感器线性度和灵敏度分别为92.3%和98.2%,响应最大值为1080,承受的最大相对湿度为95%,动态响应和恢复时间分别为4和12 s。此传感器对CO,NO2,SO2,NH3,CO2,CH4和H2等有害气体具有较好的抗干扰性。在矿井中连续使用12月后,响应衰减了9.2%,响应正常时间为10.9月。
A SnO2-CuO composite nanofiber was prepared by the coaxial electrospinning method. A new thinfilm-type hydrogen sulfide gas sensor was designed by coating SnO2-CuO composite nanofibers onto an alumina ceramic tube with Au electrodes by dip-coating method. The crystalline phase and microstructure of SnO2-CuO composite nanofibers were characterized using X-ray diffraction（ XRD） and scanning electron microscope（ SEM）. The influence of chemical composition and thickness of sensitive film on the sensitive mechanism and electrochemical characteristic of SnO2-CuO nanofibers were analyzed. The characteristic tests of hydrogen sulfide sensor including sensitive performance,temperature,relative humidity,dynamic response,interference and stability were carried out by WS-30 A type multifunction analyzer in gas sensor test system. The results demonstrated that,when the operating temperature was 25℃ and hydrogen sulfide gas concentration increased from 10 to 60 mg / L,the hydrogen sulfide sensor based on C50 composite nanofibers with 70 nm sensitive film thickness had the best linearity（ 92.3%） and sensitivity（ 98.2%）. Besides,its highest response values and relatively humidity level were 1080 and 95%,respectively,and its dynamic response time and recover time were 4 s and 12 s,respectively. This sensor showed good anti-disturbance to the gases,such as CO,NO2,SO2,NH3,CO2,CH4 and H2. The response value of the sensor was attenuated about 9. 2% when it was applied continually in the mine about 12 months,and its normal response time was 10.9 months.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2016年第9期1315-1321,共7页
Chinese Journal of Analytical Chemistry
基金
国家自然基金项目(No.51376083)
河南省高等学校重点科研项目(15A470006)资助~~
关键词
同轴静电纺丝
硫化氢
传感器
纳米纤维
敏感薄膜
Coaxial electrospinning
Hydrogen sulfide
Sensor
Composite nanofibers
Sensitive thin film
