An easy method of preparing ozone gas sensors based on ZnO nanorods

Ariadne C. Catto (1) , Luis F. Da Silva (2) , Caue Ribeiro , Sandrine Bernardini (3) , Khalifa Aguir (3) , Elson Longo (2) , Valmor. R. Mastelaro (1)

1 USP - Universidade de São Paulo = University of São Paulo
2 UNESP - Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University
3 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence

One-dimensional (1D) ZnO nanorod-like structures were successfully grown via a hydrothermal method to be used as an ozone gas sensor. X-ray diffraction measurements (XRD) and field-emission scanning electron microscopy (FE-SEM) analysis revealed a preferential growth of the nanorod-like structures along the [002] direction. Electrical resistance measurements indicated a good sensitivity to different ozone concentrations (0.06–1.19 ppm) as well as long-term stability over a 6 month period at 250 °C. In addition, it was observed that the nanorods had a good sensitivity to ozone at room temperature when the sensor was exposed to UV illumination. This study provides an easy and efficient way to obtain 1-D ZnO nanorods exhibiting remarkable properties for applications as ozone gas sensing materials.

Domaines: Matériaux; Micro et nanotechnologies/Microélectronique

Ariadne C. Catto, Luis F. Da Silva, Caue Ribeiro, Sandrine Bernardini, Khalifa Aguir, et al.. An easy method of preparing ozone gas sensors based on ZnO nanorods. RSC Advances, 2015, 5 (25), pp.19528-19533. ⟨10.1039/c5ra00581g⟩. ⟨hal-01631653⟩