基于火焰退火多孔CeO_(2)纳米片的环境监测用超快CO气体传感器  

Ultrafast CO Sensor Based on Flame-annealed Porous CeO_(2) Nanosheets for Environmental Application

作　　者：李鹏鹏 王兵 王应德[1] LI Pengpeng;WANG Bing;WANG Yingde(Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学空天科学学院,新型陶瓷纤维及其复合材料重点实验室,长沙410073

出　　处：《无机材料学报》2021年第11期1223-1230,I0006,共9页Journal of Inorganic Materials

基　　金：National Natural Science Foundation of China(61701514,51773226);Natural Science Foundation of Hunan Province(2018JJ3603)。

摘　　要：CO作为一种高毒性的气体,既是污染空气的元凶之一,长时间吸入也会对人体造成极大的伤害,甚至致死。如何实现CO的快速监测是传感领域面临的重要挑战。CO监测对保护人类健康和环境来说是一项必要的工作。在该研究中,多孔CeO_(2)纳米片(CeO_(2) NSs)通过火焰退火用简单水热法合成的中间产物CeOHCO3纳米片而得到。通过控制火焰退火时间,可将氧空位引入到CeO_(2)纳米片中。结果表明,退火2 min得到的CeO_(2)纳米片(CeO_(2)-2min NSs)对CO气体表现出优异的重复性和选择性。尤其是,CeO_(2)-2min NSs在450℃对500μL/L CO的相应/恢复时间极快(2 s/2 s),在宽范围内(10~10000μL/L)CO浓度与响应值之间存在良好的函数关系。CeO_(2)-2min NSs优秀的气敏性能可归因于多孔二维结构高的比表面积和晶体内丰富的氧空位。这项工作对设计检测宽范围气体的快响应气体传感器提供了借鉴。As a highly toxic gas,CO is one of the culprits of air pollution.Long-term inhalation will also cause great harm to the human body and even death.How to achieve rapid CO monitoring is an important challenge in sensing field.CO as one of the of air pollution,long time inhalation will reduce the oxygen carrying capacity of blood and in severe cases death.Therefore,effective monitoring of CO is necessary.In this study,porous CeO_(2) nanosheets(CeO_(2) NSs)were obtained via flame annealing intermediate product CeCO3OH nanosheets synthesized by simple hydrothermal method.Through controlling of the flame time,oxygen vacancies were introduced into the CeO_(2) NSs.As a result,the CeO_(2) NSs annealed with 2 min(CeO_(2)-2min NSs)exhibited outstanding reproducibility and selectivity towards CO gas.Particularly,the response/recovery time were extremely fast(2 s/2 s)towards 500μL/L CO at 450℃as well as finely functional relationship between response and concentration of CO at a wide detection range(10–10000μL/L).The superior gas sensing performance of CeO_(2)-2min NSs can be ascribed to the high aspect ratios of the porous two-dimensional structure and abundant oxygen vacancies in the crystals.This work may supply a strategy for designing ultrafast gas sensors which can detect target gas at a wide range.

关 键 词：火焰退火 多孔CeO_(2)纳米片 氧空位 气体传感器 宽范围 

分 类 号：TQ174[化学工程—陶瓷工业]