Cross-linked p-type Co3O4 octahedral nanoparticles in 1D n-type TiO2 nanofibers for high-performance sensing devices

Abstract

Quasi-1D nanofibers with heterostructure were prepared via a simple two-step process called the electrospinning technique and hydrothermal process. The nanostructures exhibit the unique feature of TiO₂ nanofibers (250 nm) kept inside and well-structured Co₃O₄ octahedral nanoparticles loading outside. The cross-linked Co₃O₄/TiO₂ nanostructures exhibit intriguing morphologies, architectures and chemical compositions. As a potential sensing material in chemosensor applications, the quasi-1D heterostructure nanofibers exhibit a relatively high catalysis response to CO, and good CO-sensing performance even exposure to a humid environment.