Design and Synthesisof Parallel Bicomponent HeterojunctionNanofibers as Flexible Room-Temperature Sensors for Ppb-Level NO₂ Detection

Abstract

Enhancing the stability and selectivity of flexible room-temperature gas sensors has been of extensive concern for their practical application. However, it is very challenging to combine the integration of excellent mechanical flexibility and outstanding gas sensing properties. This study presents the design of a parallel structure of ZnO//In₂O₃ bicomponent nanofibers using a homemade V-type dual-channel electrospinning technique. Compared with as-electrospinning pure ZnO nanofibers and pure In₂O₃ nanofibers, the ZnO//In₂O₃-2 composite nanofibers showed higher response and low detection line NO₂ at room temperature. The ZnO//In₂O₃-2 nanofibers have a maximum high response of 109.84 to 60 ppm of NO₂ at room temperature, which is about 8.44 times higher than that of the pure In₂O₃ nanofibers. Moreover, the theoretical detection limit for NO₂ is determined to be 1.99 ppb. We have investigated the excellent flexibility of the gas sensor for potential application. These findings indicate that the flexible ZnO//In₂O₃-2 nanofiber sensors hold great prospect in the application of portable and room-temperature ppb NO₂ detection equipment.