Improvement of Acetone Sensing Performance in rGO Modified ZnO Nanotubes Based Binary Hybrid Structure at Low Temperature

摘要

The current paper focuses on the improvement of acetone sensing behavior in ZnO nanotubes (NTs)based binary hybrid device, employing surface decoration of those bare ZnO NTs by reduced graphene oxide (rGO). To confirm the formation of this binary hybrid structure (rGO-ZnO NTs), the following characterizations viz. FESEM, Raman spectroscopy and XPS were performed. Acetone was used here as the sample test vapor towards 1-700 ppm range of concentrations for the hybrid sensor device and the result of the sensing performance was also compared with its bare ZnO NTs counterpart. The sensing performance was studied at relatively low operating temperature range (27°C-50°C). It was revealed from the above study that the sensing performance of the modified device was significantly improved, nearly four times of response magnitude towards 700 ppm concentration of acetone vapor, compared to that of its bare counterpart. The underlying p-type sensing performance of this hybrid structure was also elucidated with the help of the rGO coverage area on ZnO NTs and I-V characteristics.