Detection of a trace amount of NO_(2) at room temperature has very important applications in air quality monitoring,protection of human health and medical diagnose.However,the existing NO_(2) sensors often suffer from...Detection of a trace amount of NO_(2) at room temperature has very important applications in air quality monitoring,protection of human health and medical diagnose.However,the existing NO_(2) sensors often suffer from low sensitivity when the concentration at the ppb-level.Here,we report a new kind of materials based on graphdiyne(GDY)for highly sensitive detection of ppb-level(ppb:part per billion)NO_(2) at room temperature.After thermal treatment of the as-prepared GDY at 600℃under argon atmosphere for 2 h(the obtained sample denoted as GDY-600),the prepared sensor with GDY-600 displays excellent sensitivity with a response value of 6.2%towards 250 ppb NO_(2) at room temperature,which is better than most of reported sensing materials.In addition,the sensor exhibits significantly high selectivity to NO_(2) against typical interfering gases including CO,CO_(2),NH_(3),H_(2),H_(2)S and toluene.Moreover,the sensor shows remarkable stability after repetitive measurements.The superior sensing performance of GDY-600 can be ascribed to the highlyπ-conjugated structure with special acetylenic bonds and abundant oxygen-containing functional groups,which are all beneficial for the gas adsorption and redox reaction on the surface.展开更多
基金This work was supported by the National Key Research and Development Program of China(No.2018YFA0208504)the National Natural Science Foundation of China(No.21932006)the Youth Innovation Promotion Association of CAS(No.2017049).
文摘Detection of a trace amount of NO_(2) at room temperature has very important applications in air quality monitoring,protection of human health and medical diagnose.However,the existing NO_(2) sensors often suffer from low sensitivity when the concentration at the ppb-level.Here,we report a new kind of materials based on graphdiyne(GDY)for highly sensitive detection of ppb-level(ppb:part per billion)NO_(2) at room temperature.After thermal treatment of the as-prepared GDY at 600℃under argon atmosphere for 2 h(the obtained sample denoted as GDY-600),the prepared sensor with GDY-600 displays excellent sensitivity with a response value of 6.2%towards 250 ppb NO_(2) at room temperature,which is better than most of reported sensing materials.In addition,the sensor exhibits significantly high selectivity to NO_(2) against typical interfering gases including CO,CO_(2),NH_(3),H_(2),H_(2)S and toluene.Moreover,the sensor shows remarkable stability after repetitive measurements.The superior sensing performance of GDY-600 can be ascribed to the highlyπ-conjugated structure with special acetylenic bonds and abundant oxygen-containing functional groups,which are all beneficial for the gas adsorption and redox reaction on the surface.
