TiO2 nanofibers decorated with monodispersed WO3 heterostruture sensors for high gas sensing performance towards H2 gas

Abstract WO3-TiO2 heterostructural nanofibers (HNFs) were prepared by a simple spin coating method. The structures, chemical constitutions and morphologies of the samples characterized various kinds techniques, including XRD, XPS, EDX, BET, SEM TEM. results suggested that WO3 nanoparticles with size range 20–30 nm decorated uniformly on surface TiO2 in composite thin films. XPS confirmed existence W5+and increased amount both chemisorbed oxygen species vacancies after nanofibers. Compared pure materials, HNFs exhibited higher response (78.21 ± 0.35) %), rapid (20 s) recovery time (23 s), better selectivity long term stability towards H2 gas. gas-sensitive properties improvement is due to high area, which leaded an increase gas adsorption sites. Moreover, Fermi level effect metal oxide heterojunction formed also markedly enhanced sensitivity samples.