Synthesis of hierarchical ZnO orientation-ordered film by chemical bath deposition and its gas sensing properties

Abstract The uniform hierarchical ZnO ordered nanoclusters were deposited on quartz substrates via a facile chemical bath deposition method. Field emission scanning electron microscopic and transmission electron microscopic results revealed that these hierarchical nanoclusters were built from one-dimensional single crystal nanorods. The morphology of the prepared products could be tailored by changing the deposited time. On the basis of experimental results, a possible growth progress and mechanism of hierarchical ZnO ordered nanoclusters were proposed. In addition, the planar type gas sensor using as-prepared ZnO ordered film deposited for 60 min showed good response to 1 ppm NO2 at room temperature under UV light illumination.