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The effect of pulsed laser annealing (PLA) on the photoluminescence (PL) properties of ZnO nanorods was investigated. As the fluence of pulsed laser increases, the UV PL in ZnO nanorods shows a general increasing trend, except at a range of fluences from 10 to 70 mJ/cm 2 . It is found that the treatment with the PLA at the fluence of 70 mJ/cm 2 leads to a larger improvement of crystalline properties than that with rapid thermal annealing (RTA). The relationship between PL intensity and fluence of pulsed lasers can be well explained by a combination of the deterioration in surface crystallinity and the increased donor densities after PLA.

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In this study, TiO 2 nanoparticles at different weight ratios were added to composite coconutshell carbon and conductive carbon black electrode material to investigate their effects on the properties of a supercapacitor. Then, the composite carbon electrodes were further treated by rapid thermal annealing (RTA) and measured by field emission scanning electron microscopy (FE-SEM), electronic data system (EDS) analysis, cyclic voltammetry (CV), and chargedischarge and photoluminescence (PL) tests to investigate the diverse effects on the electrodes with conductive carbon black doped with TiO 2 nanoparticles and on the electrodes treated with and without RTA. According to the results of CV, the capacitance of electrodes without TiO 2 nanoparticles was determined to be 73.104 F/g by scanning at a rate of 25 mV/s, and could be increased to 96.54 F/g with TiO 2 -doped carbon electrodes. In addition, the capacitance of carbon electrodes with TiO 2 could be increased to 171.28 F/g after heat treatment by RTA.

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