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Preparation and Photoluminescence Properties of ZnO-Covered Carbon Fibers

This paper reports that ZnO nanosheet-covered carbon fibers are synthesized by thermal oxidation of zinc films deposited on carbon fiber surfaces. The structure and optical properties were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum. The result shows that all of the cabon fibers are coated ZnO nanosheets. An orange-red emission around 683 nm was found in PL spectrum when the sample prepared at 400 oC for 4 hours in air. I considered that the growth of ZnO nanosheets may be related to the size of substrates and reaction temperature. The orange-red emission was resulted from the interstitial carbon of ZnO-nanosheet-covered fibers, and green emission results from the oxygen vacancies.