Electrospun TiO_2//SnO_2 Janus nanofibers and its application in ethanol sensing

摘要

Achieving a novel nanostructure is the key to improve the gas sensing properties of metal oxide semiconductor (MOS). Herein, [PVP/Ti(SO4)(2)]//[PVP/SnCl4] composite Janus nanofibers (NFs) are synthesized by a parallel electrospinning method and TiO2//SnO2 Janus NFs are obtained by calcining the composite. To investigate potential gas sensing application of the TiO2//SnO2 Janus NFs, commercial gas sensor based on the TiO2//SnO2 Janus NFs was fabricated, ethanol was selected as the target gas and the gas sensing properties were measured. The results indicated that the TiO2//SnO2 Janus NFs displayed a quick response-recovery and good selectivity to ethanol. Additionally, a possible mechanism of the improved sensing abilities is also illustrated, which can provide guidance for the development of gas-sensitive NFs with Janus structure. (C) 2019 Elsevier B.V. All rights reserved.