CTAB‐Assisted Hydrothermal Synthesis of WO 3 Hierarchical Porous Structures and Investigation of Their Sensing Properties

WO 3 hierarchical porous structures were successfully synthesized via cetyltrimethylammonium bromide‐ (CTAB‐) assisted hydrothermal method. The structure and morphology were investigated using scanning electron microscope, X‐ray diffractometer, transmission electron microscopy, X‐ray photoelectron spectra, Brunauer‐Emmett‐Teller nitrogen adsorption‐desorption, and thermogravimetry and differential thermal analysis. The result demonstrated that WO 3 hierarchical porous structures with an orthorhombic structure were constructed by a number of nanoparticles about 50–100 nm in diameters. The H 2 gas sensing measurements showed that well‐defined WO 3 hierarchical porous structures with a large specific surface area exhibited the higher sensitivity compared with products without CTAB at all operating temperatures. Moreover, the reversible and fast response to H 2 gas and good selectivity were obtained. The results indicated that the WO 3 hierarchical porous structures are promising materials for gas sensors.