摘要
采用双喷嘴静电纺丝法制备了CeO_2-Co_3O_4纳米纤维,将制备的CeO_2-Co_3O_4纳米纤维均匀涂覆于ω型加热线圈表面形成催化发光薄膜,设计了一种新型催化发光甲醛传感器。采用X射线衍射仪、扫描电子显微镜、全自动程序化学吸附仪和X-射线光电子能谱仪,表征了Co_3O_4-CeO_2纳米纤维的相组成和微观形貌,讨论了甲醛在CeO_2-Co_3O_4催化剂表面的电化学特性和催化发光机理。在优化条件下,即波长500 nm、温度550℃、载气流速0.2 L/min,甲醛传感器件(Ce_30)催化发光强度与甲醛浓度在1.2~50μg/m^3范围内有良好的线性关系,灵敏度为40.04 a.u./(μg/m^3),检出限为1.2μg/m^3,动态响应和恢复时间分别为2.4和3.5 s。此传感器可用于汽车尾气中甲醛浓度检测,相对误差范围为0.4%~1.1%,相对标准偏差RSD<3%(n=6)。
CeO2-Co_3O_4 composite nanofibers were prepared by the double jets electrospinning method. The nanofibers were then deposited onto the surface of a ω-type heating coil as cataluminescence material to prepare a new cataluminescence（ CTL） type formaldehyde gas sensor. The crystalline phase and microstructure of CeO_2-Co_3O_4 composite nanofibers were characterized by X-ray diffraction（ XRD） and scanning electron microscope（ SEM）,and the cataluminescence mechanism and electrochemical characteristic of formaldehyde on the surface of CeO_2-Co_3O_4 nanofibers were analyzed by H2 temperature programmed reduction（ H2-TPR） and X-ray photoelectron spectroscopy（ XPS）. Under the optimal conditions（500 nm of wavelength,0.2 L/min of flow rate and 550℃）,there was a good relationship between the CTL intensity of this formaldehyde gas sensor（ Ce_30） and formaldehyde concentration in the range of 1. 2-50 μg/m^3,the sensitivity was 40. 04 a. u./（ μg/m^3）,the detection limit was 1.2 μg/m^3,the dynamic response time and recover time of formaldehyde gas were 2.4 s and 3.5 s,respectively. The formaldehyde sensor was successfully applied to the determination of formaldehyde in the automotive exhaust,with relative errors of 0.39%-1.07%and relative standard deviations of less than 3%.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2017年第11期1621-1627,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(No.18A470002)资助~~
关键词
静电纺丝
甲醛
传感器
纳米纤维
催化发光
汽车尾气
Electrospinning
Formaldehyde
Sensor
Composite nanofibers
Cataluminescence
Automotiveexhaust.
