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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.

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