New insight into gas sensing performance of nanorods assembled and nanosheets assembled hierarchical WO3•H2O structures

WO3 center dot H2O hierarchical structures assembled by nanorods or nanosheets were successfully synthesized via a facile hydrothermal method. Gas sensing behaviors were investigated for these two different nanostructures towards ethanol gas. The results indicated that the nanorods assembled flower-like structure exhibits faster response and recovery time as compared with the nanosheets assembled microspheres, which may be attributed to fast gas diffusion speed in the nanorods assembled nanostructures, while the nanosheets assembled hierarchical flower-like WO3 center dot H2O structures exhibited higher response (54) than that of the WO3 center dot H2O microspheres (25) because of the larger specific surface area and the abundant micro reaction rooms. (C) 2018 Elsevier B.V. All rights reserved.