Formaldehyde is the most popular and highly toxic indoor pollutants.It is very urgent to develop more sensitive formaldehyde gas sensors with remarkable sensitivity at the ppb level.In this study,for the first time,th...Formaldehyde is the most popular and highly toxic indoor pollutants.It is very urgent to develop more sensitive formaldehyde gas sensors with remarkable sensitivity at the ppb level.In this study,for the first time,the olivine-structured Cd_(2)GeO_(4)was identified as an excellent formaldehyde sensing material.The as-obtained Cd_(2)GeO_(4)and other sensing materials were well characterized by XRD,SEM,TEM,XPS,scanning Kelvin probe and O_(2)temperature-programmed desorption techniques.The sensor based on the asprepared Cd_(2)GeO_(4)exhibits a high response of 14.1,a short response time(about 5 s)towards 10 ppm formaldehyde and a low detection limit of 60 ppb formaldehyde at a relatively low operating temperature of 140℃,benefiting the practical application.We believe that the excellent formaldehyde sensing performance should be attributed to the rich chemisorbed oxygen,the small size and the appropriate Fermi level of Cd_(2)GeO_(4).It can be expected that it will be a promising material for fabricating excellent formaldehyde gas sensors due to its unique sensing characteristics.展开更多
基金supported by the National Natural Science Foundation of China(21975093)the Key research and development program of Liaoning provincial(2020JH2/10600003).
文摘Formaldehyde is the most popular and highly toxic indoor pollutants.It is very urgent to develop more sensitive formaldehyde gas sensors with remarkable sensitivity at the ppb level.In this study,for the first time,the olivine-structured Cd_(2)GeO_(4)was identified as an excellent formaldehyde sensing material.The as-obtained Cd_(2)GeO_(4)and other sensing materials were well characterized by XRD,SEM,TEM,XPS,scanning Kelvin probe and O_(2)temperature-programmed desorption techniques.The sensor based on the asprepared Cd_(2)GeO_(4)exhibits a high response of 14.1,a short response time(about 5 s)towards 10 ppm formaldehyde and a low detection limit of 60 ppb formaldehyde at a relatively low operating temperature of 140℃,benefiting the practical application.We believe that the excellent formaldehyde sensing performance should be attributed to the rich chemisorbed oxygen,the small size and the appropriate Fermi level of Cd_(2)GeO_(4).It can be expected that it will be a promising material for fabricating excellent formaldehyde gas sensors due to its unique sensing characteristics.
