Abstract
Wurtzite (W)-type ZnO nanocondensates and particulates with enhanced solid solubility of Si4+ and special defect nanostructures were synthesized via pulsed laser ablation of Zn2SiO4/ZnO composite target under a relatively high peak power density of 1.4 × 1012 W/cm2 in high vacuum (3.5 × 10−5 torr). The nanocondensates were either dispersed in an amorphous Zn–O–Si phase as a composite sphere up to submicrons in size or coalesced by the {\(10\overline{1} 1\)}, {\(11\overline{2} 3\)}, and {\(10\overline{1} 0\)} facets as unity and twin. The particulates tended to have an epitaxial 1D commensurate 2× (0002) superstructure (i.e., 1 × 1 × 2 superstructure in 3D) at the edge with enhanced Si4+ doping and the amorphous phase coverage. Such W-ZnO nanocondensates and particulates have modified Raman bands and photoluminescence due to internal compressive stress and overdoped Si4+ in substitutional and/or interstitial sites coupled with charge/volume compensating defects for potential optoelectronic and optocatalytic applications.
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Acknowledgments
We thank L. J. Wang and S. Y. Yao for technical assistance on FETEM and Cs-corrected STEM, respectively. Supported by Ministry of Science and Technology, Taiwan, ROC, under contract MOST 103-2221-E-218-008.
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Huang, CN., Chen, SY., Zheng, Y. et al. Solubility enhancement and epitaxial core–shell structure of Si-doped ZnO via a specific pulsed laser ablation route. Appl. Phys. A 120, 1033–1045 (2015). https://doi.org/10.1007/s00339-015-9273-2
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DOI: https://doi.org/10.1007/s00339-015-9273-2