Photoluminescence Property of Co₃O₄ Nanowires

Co₃O₄ nanowire arrays are fabricated by electrodeposition with following heat-treatment in atmosphere ambient. Photoluminescence is investigated at 295K. In the experiment, when increasing the excitation light wavelength from 260nm to 360nm, two kinds of emissions corresponding to the increasing excitation light wavelength are observed. One of them alters the excited emission position, another keeps its emission position. The distinct behaviour of excited emissions related to the increasing excitation wavelength indicates
that the mechanism of them must be different. According to the experimental comparison and first-principle calculation, the two kinds of emissions are discussed.