Characterization and Humidity Sensing Application of ZnO-TiO2 Nanocomposite
Paper reports morphological and relative humidity sensing studies of ZnO-TiO2 nanocomposite powder pellets obtained through solid-state reaction route. When exposed to humidity, resistance of pellets decreases with increase in relative humidity from 10-90%. Sensing element with 15 weight % of TiO2 in ZnO shows best results with maximum sensitivity of 9.08 MΩ/%RH in 10-90% relative humidity range. This sensing element manifests smallest crystallite size of 71 nm as measured from XRD and lowest grain size of 207 nm calculated from SEM micrograph. This sensing element has the lowest value of activation energy, and hence higher electronic conduction.
N. K. Pandey et al., "Characterization and Humidity Sensing Application of ZnO-TiO2 Nanocomposite", Advanced Materials Research, Vol. 304, pp. 48-52, 2011