Enhanced Humidity Sensing Behaviour of Sol-Gel Derived ZnO-C65 Heterostructure Thin Films

Humidity sensing characteristics of conducting carbon C65 modified ZnO heterostructure films are reported. Pristine ZnO and it hybrid composite with C65 were processed using sol-gel technique by adding different concentration of C65 carbon. Crystalline and morphological features of the samples are examined by X-ray diffraction and scanning electron microscopy studies. Change in the morphology of the ZnO particles is observed upon addition of C65 carbon. Humidity sensing studies on ZnO-C65 heterostructure films have shown enhanced sensitivity factors than pure ZnO films. The results are attributed to the formation of heterostructures of conducting C65-semiconducting ZnO, and nanostructured morphological changes.