Ultra-low concentration detection of NH3 using rGO/Cu2O nanocomposites at low temperature

Abstract

It has been a major challenge to develop a gas sensor capable of detecting ppblevel ammonia (NH 3 ) with high response at low temperature. Herein, Cu 2 O nanoblocks uniformly dispersed on wrinkle structure of reduced graphene oxide (rGO)-based nanocomposites synthesized via a water bath heating method. Characterizations results illustrate that Cu 2 O nanoblocks are evenly dispersed on the surface of rGO. Additionally, The gas sensing experiments displayed that the as-obtained rGO/Cu 2 O nanocomposites exhibited the extremely fast response (1s) and recovery time (1s), high-performance gas sensing property for ultra-low concentration (5 ppb) NH 3 detections at low temperature (80 °C), which owe to the mesoporous structure, excellent charge carriers transport properties and large specific surface area. Meanwhile, the probable enhancing mechanism of rGO/Cu 2 O nanocomposites was discussed as well. Therefore, it is expected that rGO/Cu 2 O nanocomposites with remarkable sensing performance for the future development in monitoring and detecting NH 3 at low temperature.

Reduced Graphene Oxide@Bimodal TiO2 Nanocomposites as an Efficacious Console for Room Temperature n-Butanol Gas Sensing

“…The obvious solution to overcome these problems associated with both metal oxides and rGO is to blend them together to gain the advantage of their important properties, leading to the generation of heterostructures or composites. So far, various rGO-metal oxide-based heterostructures/composites such as rGO-SnO 2, rGO-Co 3 O 4, rGO-ZnO, rGO-WO 3, rGO-Cu 2 O, rGO-NiO, rGO-MoO 3 , and rGO-TiO 2 have been explored for the detection of gases and other analytes. Among them, rGO-TiO 2 composites have been reported for the sensing of different gases and vapors such as NO, NH 3 , ethanol, methanol, acetone, etc. − …”