ZnO Nanostructures Based Gas Sensors: A Short Review

  • Pushpendra Kumar .

Abstract

Zinc oxide based gas sensors have been widely investigated due to its unique sensitivity, stability and
low cost. However, high operating temperature and selectivity is still a challenge. To enhance the
sensing properties of ZnO, various strategies being adopted. Sensing is a surface phenomenon which
can be affected by many factors like surface area, electronic movement and microstructure of sensing
material. Using nanotechnology as tailoring tool, many types of nanostructures of ZnO like nanoods,
nanotubes, nanowires possessing different morphology can be formed. ZnO based nanoheterostructures have also been explored to enhance the sensitivity. Selectivity is a one of the major
issue related to ZnO and lots of efforts have been made to increase the sensitivity. In this manuscript,
various factors which can affect the sensor response, sensitivity and operating temperature are
debated. Effect of surface morphology, microstructure, Heterostructures, operating temperature and
UV activation on sensing properties and operating temperature are discussed in detail.

Published
2019-12-24
Section
Articles