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Electronic structure, optical and magnetic studies of PLD-grown (Mn, P)-doped ZnO nanocolumns at room temperature

TitleElectronic structure, optical and magnetic studies of PLD-grown (Mn, P)-doped ZnO nanocolumns at room temperature
Publication TypeJournal Article
Year of Publication2017
AuthorsPhan, TL, Ho, TA, Dang, NT, Nguyen, MC, Dao, VD
JournalJournal of Physics D-Applied Physics
Date Published07
Type of ArticleArticle
ISBN Number0022-3727
Accession NumberWOS:000404719800002
Keywords(Mn, P)-ZnO nanocolumns, chemical-vapor-deposition, electronic and crystal structures, ferromagnetic properties, field control, gas-sensing properties, Magnetic properties, mn-doped zno, nanoparticles, optical and, physics, pulsed-laser deposition, sol-gel synthesis, zinc-oxide, zn1-xmnxo thin-films

We prepared well-aligned Zn1-xMnxO: P-y nanocolumns (x = 0-0.02, and y = 0 and 1 mol%) on SiO2/Si(001) substrates by using pulsed laser deposition (PLD) and then investigated their electronic structure and optical and magnetic properties at room temperature. The analyses of x-ray photoelectron and x-ray absorption fine structure spectra revealed Mn2+ and/or P ions existing in nanocolumns, where Mn2+ ions are situated in the Zn2+ site of the ZnO-wurtzite structure. Although the incorporation of Mn2+ and/or P ions did not form secondary phases, as confirmed by x-ray and electron diffraction patterns, more lattice defects were created, and consequently changed the band-gap energy as well as the electron-phonon interactions in the nanocolumns. Magnetization versus magnetic-field measurements revealed that all the samples exhibited FM order. In particular, the (Mn, P) co-doping with x = 0.02 and y = 1 remarkably enhanced the magnetic moment up to 2.92 mu(B)/Mn. Based on the results obtained from analyzing the electronic structures, UV-Vis absorption and resonant Raman scattering spectra, and theoretical calculations, we believe that the enhancement of the FM order in (Mn, P)-doped ZnO nanocolumns is due to exchange interactions taking place between vacancymediated Mn2+ ions.

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