In this work, a structure of assembled porous graphene multilayer frameworks was demonstrated to endow the resultant sensing devices with batch uniformity, good response, sensitivity, and selectivity.
The nanosheet stacking phenomenon in graphene thin films significantly deteriorates their gas-sensing performance. This nanosheet stacking issue should be solved and reduced to enhance the gas detection sensitivity. In this study, we report a novel ammonia (NH
3
) gas sensor based on holey graphene thin films. The precursors, holey graphene oxide (HGO) nanosheets, were prepared by etching graphene under UV irradiation with Fenton reagent (Fe
2+
/Fe
3+
/H
2
O
2
). Holey graphene was prepared by the reduction of HGO (rHGO) with pyrrole. Holey graphene thin-film gas sensors were prepared by depositing rHGO suspensions onto the electrodes. The resulting sensing devices show excellent response, sensitivity, and selectivity to NH
3
. The resistance change is 2.81% when the NH
3
level is as low as 1 ppm, whereas the resistance change is 11.32% when the NH
3
level is increased to 50 ppm. Furthermore, the rHGO thin-film gas sensor could be quickly restored to their initial states without the stimulation with an IR lamp. In addition, the devices showed excellent repeatability. The resulting rHGO thin-film gas sensor has a great potential for applications in numerous sensing fields because of its low cost, low energy consumption, and outstanding sensing performance.
Electronic supplementary material
The online version of this article (10.1186/s11671-019-3060-5) contains supplementary material, which is available to authorized users.
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