Band gap tuning of ZnO nanoparticles via Mg doping by femtosecond laser ablation in liquid environment

E. Chelnokov, M. Rivoal, Y. Colignon, D. Gachet, L. Bekere, F. Thibaudau, S. Giorgio, V. Khodorkovsky, W. Marine

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)9408-9411
Number of pages4
JournalApplied Surface Science
Volume258
Issue number23
DOIs
StatePublished - 15 Sep 2012
Externally publishedYes

Keywords

  • Exciton emission
  • HRTEM
  • Laser ablation
  • Zinc oxide
  • ZnO/MgO

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