VLS Growth of Highly Oriented SnO₂Nanorods and ZnO Hybrid Films for Gas Sensing Measurements

Tin Oxide (SnO 2 ) nanorods have been successfully grown on a p-type Si substrate by a low-temperature vapor-liquid-solid (VLS) technique. Tin chloride and zinc chloride powders were used as starting materials. Surface morphologies and structural properties of the SnO 2 nanorods were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The SEM images shows distinct hierarchical growth of SnO 2 as well as the mixture with ZnO microstructures. The structural studies demonstrated rutile crystal structure SnO 2 nanorods with square-shaped facets of 40–60 nm in cross section size and 2 μm in length approximately and ZnO microrods of 10 μm diameter and 50 μm length. The fabrication of a gas sensor for acetone and ethanol vapors is also reported and its properties are discussed.