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Photo-initiated growth of zinc oxide (ZnO) nanorods |
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| Authors: | E.T.Y. Lee Y. Shimotsuma M. Nishi K. Hirao |
| Affiliation: | a International Innovation Center, Kyoto University, Kyotodaigaku-katsura, Nishikyo-ku, Kyoto 615-8520, Japan b Department of Material Chemistry, Kyoto University, Kyotodaigaku-katsura, Nishikyo-ku, Kyoto 615-8510, Japan |
| Abstract: | A photo-initiated process via femtosecond pulse-induced heterogeneous nucleation in zinc ammine complex (Zn(NH3)42+)-based aqueous solution without catalyst and surfactant, followed by hydrothermal treatments for crystal growth into zinc oxide (ZnO) nanorods, was investigated. Flat-top hexagonal ZnO nanorods with smooth planes of diameter ≥ 100 nm and length ≤ 1 μm were grown with laser irradiation, compared to porous rod-like structures without irradiation. The flat-top planes indicate slow growth rate, due to the intermediate step of Zn(NH3)42+ decomposition to Zn(OH)42−, before dehydration to ZnO. Prolonged hydrothermal treatment produced nanotubes and lateral splits due to OH− erosion of the crystal faces. XRD analysis showed a hexagonal crystal structure while photoluminescence study indicated a peak at about 380 nm. |
| Keywords: | Zinc oxide Nanorods Laser processing Ultrashort pulse Crystal Growth |
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