EPR investigation of pure and Co-doped ZnO oriented nanocrystals

Adrien Savoyant (1) , H Alnoor (2) , Sylvain Bertaina (1) , O Nur (2) , M Willander (2)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 Department of Science and Technology

Pure and cobalt-doped zinc oxide aligned nanorods have been grown by the low-temperature (90 °C) aqueous chemical method on amorphous ZnO seed layer, deposited on a sapphire substrate. High crystallinity of these objects is demonstrated by the electron paramagnetic resonance investigation at liquid helium temperature. The successful incorporation of Co2+ ions in substitution of Zn2+ ones in the ZnO matrix has also been confirmed. A drastic reduction of intrinsic ZnO nanorods core defects is observed in the Co-doped samples, which enhances the structural quality of the NRs. The quantification of substitutional Co2+ ions in the ZnO matrix is achieved by comparison with a reference sample. The findings in this study indicate the potential of using the low-temperature aqueous chemical approach for synthesizing material for spintronics applications. Keywords:

Domains: Physics [physics]; Condensed Matter [cond-mat]; Strongly Correlated Electrons [cond-mat.str-el]

Adrien Savoyant, H Alnoor, Sylvain Bertaina, O Nur, M Willander. EPR investigation of pure and Co-doped ZnO oriented nanocrystals. Nanotechnology, 2017, 28 (3), ⟨10.1088/1361-6528/28/3/035705⟩. ⟨hal-01473894⟩