Graphdiyne: a Highly Sensitive Material for ppb-Level NO₂ Gas Sensing at Room Temperature

Abstract

Detection of a trace amount of NO₂ at room temperature has very important applications in air quality monitoring, protection of human health and medical diagnose. However, the existing NO₂ 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) NO₂ at room temperature. After thermal treatment of the as-prepared GDY at 600 °C 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 NO₂ at room temperature, which is better than most of reported sensing materials. In addition, the sensor exhibits significantly high selectivity to NO₂ against typical interfering gases including CO, CO₂, NH₃, H₂, H₂S and toluene. Moreover, the sensor shows remarkable stability after repetitive measurements. The superior sensing performance of GDY-600 can be ascribed to the highly π-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.

Keywords

Graphdiyne / Gas sensor / NO₂ / ppb-Level

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