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Article Dans Une Revue Journal of Applied Physics Année : 2017

An effective low-temperature solution synthesis of Co-doped [0001]-oriented ZnO nanorods

Hatim Alnoor
  • Fonction : Auteur
Xianjie Liu
  • Fonction : Auteur
Galia Pozina
  • Fonction : Auteur
Magnus Willander
  • Fonction : Auteur
Omer Nur
  • Fonction : Auteur

Résumé

We demonstrate an efficient possibility to synthesize vertically aligned pure zinc oxide (ZnO) and Co-doped ZnO nanorods (NRs) using the low-temperature aqueous chemical synthesis (90 degrees C). Two different mixing methods of the synthesis solutions were investigated for the Co-doped samples. The synthesized samples were compared to pure ZnO NRs regarding the Co incorporation and crystal quality. Electron paramagnetic resonance (EPR) measurements confirmed the substitution of Co2+ inside the ZnO NRs, giving a highly anisotropic magnetic Co2+ signal. The substitution of Zn2+ by Co2+ was observed to be combined with a drastic reduction in the core-defect (CD) signal (g similar to 1.956) which is seen in pure ZnO NRs. As revealed by the cathodoluminescence (CL), the incorporation of Co causes a slight red-shift of the UV peak position combined with an enhancement in the intensity of the defect-related yellow-orange emission compared to pure ZnO NRs. Furthermore, the EPR and the CL measurements allow a possible model of the defect configuration in the samples. It is proposed that the as-synthesized pure ZnO NRs likely contain Zn interstitial (Zn-i(+)) as CDs and oxygen vacancy (V-O) or oxygen interstitial (O-i) as surface defects. As a result, Co was found to likely occupy the Zn-i(+), leading to the observed CDs reduction and hence enhancing the crystal quality. These results open the possibility of synthesis of highly crystalline quality ZnO NRs-based diluted magnetic semiconductors using the low-temperature aqueous chemical method. Published by AIP Publishing.
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Dates et versions

hal-01694219 , version 1 (14-04-2018)

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Hatim Alnoor, Adrien Savoyant, Xianjie Liu, Galia Pozina, Magnus Willander, et al.. An effective low-temperature solution synthesis of Co-doped [0001]-oriented ZnO nanorods. Journal of Applied Physics, 2017, 121 (21), ⟨10.1063/1.4984314⟩. ⟨hal-01694219⟩
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