Abstract
The larger surface area and increased point contacts of hierarchically arranged ZnO nanowires (upper panel) offered more potential barriers for the gas molecule exhibiting binding strength CO < C2H5OH < NH3 (lower panel) and provided excellent gas-sensing performance at 100 °C for NH3 gas.
Highlights
The well-constituted hierarchical arrangement of hexagonal ZnO nanowires with diameters o180 nm and lengths B5–6 mm with clearly visible textural boundaries provided a highly porous film of thickness, B1300 nm over a large area
The experimental observations are corroborated by first-principles density functional theory (DFT) calculations, which were performed to determine the reactivity of gas molecules with hexagonal ZnO nanowires
The response and recovery times were estimated at 90% of the maximum and minimum resistance values observed for the ZnO nanowires, respectively, during gas sensing studies.[26]
Summary
The well-constituted hierarchical arrangement of hexagonal ZnO nanowires with diameters o180 nm and lengths B5–6 mm with clearly visible textural boundaries provided a highly porous film of thickness, B1300 nm over a large area. The ZnO nanowires delivered excellent sensing performance for CO, C2H5OH, and NH3 reducing gases at a safe detection limit of 50 ppm at an operating temperature of 100 1C.
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