Abstract
Novel caltrop-like ZnO nanostructures are fabricated on Si (100) substrate using the chemical vapor deposition (CVD) method at 1000°C. The XRD pattern confirms that the as-grown products are ZnO nanostructures which preferentially oriented in the [0001] direction. Every nanostructure has four short ramifications and each ramification is less than 100nm in thickness and from 1.0 to 1.4μm in length. Further analyses on structure demonstrate that the caltrop-like ZnO nanostructures have single crystalline wurtzite hexagonal structure. Room-temperature photoluminescence (PL) studies of the caltrop-like nanostructures have revealed a weak UV emission band at 384nm and a strong emission band at 526nm which indicates the caltrop-like ZnO nanostructures are of excellent optical properties.
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