Particle size effect on gas sensing properties of ZnO pellets

Abstract

In this work, zinc oxide (ZnO) nanopowders were prepared by a homogeneous precipitation method. Eight samples were prepared under different conditions using Taguchi method. Structural and morphological properties were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Pellets were manufactured at different pressing conditions and pellets were measured in propane gas (C3H8) at different concentration and measuring temperatures. Best sensitivity was obtained with the pellet ZnO-1 of a particle size of 38.7 nm with an order of magnitude of 4.