Journal
APPLIED SURFACE SCIENCE
Volume 258, Issue 23, Pages 9408-9411Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.08.132
Keywords
Laser ablation; Zinc oxide; ZnO/MgO; Exciton emission; HRTEM
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Funding
- ANR (French Agency for National Research), project NEM [09-0107-01]
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We use multiphoton IR femtosecond laser ablation to induce non-thermal non-equilibrium conditions of the nanoparticle growth in liquids. Modifications of the electronic properties of ZnO NP were achieved by Mg ion doping of targets prepared from mixtures of Zn and Mg acetylacetonates. The nanoparticle sizes were 3-20 nm depending on the ablation conditions. X-ray fluorescence indicates that stoichiometric ablation and incorporation of Mg in nanocrystalline ZnO occurs. HRTEM observations show that nanoparticles retain their wurtzite structure, while at high Mg concentrations we detect the MgO rich domains. Exciton emissions exhibit relatively narrow bands with progressive and controlled blue shifts up to 184 meV. The exciton energy correlates to band edge absorption indicating strong modification of the NP band gaps. Stabilisation of the exciton blue shift is observed at high Mg concentration. It is accompanied by the formation of structure defects and ZnO/MgO phase separation within the nanoparticles. (c) 2011 Elsevier B.V. All rights reserved.
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