Chemical solution epitaxy of ZnO nanorods

摘要

Well aligned ZnO nanorods were grown on (111) oriented single crystal spinel substrates atntemperatures below 100uC. The nanorods were epitaxially grown on the substrate without the usenof seed layer, having diameters of 200–500 nm and high density (109 cm22). It was observed thatnheat treatment of the substrate before growth was essential for nanorod nucleation and growth. Xrayndiffraction shows that the crystalline and epitaxial ZnO nanorods are strongly oriented alongnthe c axis. The photoluminescence spectrum of as grown nanorods presents a strong UVnemission peak at 3?28 eV and a relatively weak deep-level emission peak at 2?10 eV. A postgrowthntreatment consisting of thermal annealing and nitrogen plasma led to significantnimprovement in the optical quality of the nanorods.