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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2016.1
- 수록면
- 52 - 66 (15page)
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Undoped and Mn-doped ZnO nanoparticles (Zn1-xMnxO), with nominal weight percentages (0:00 ≤ x ≤ 0.10), have been synthesized by co-precipitation technique. The synthesized nanoparticles are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV) and Fourier transform infrared spectroscopy (FTIR). From XRD analysis, the compound ZnMnO3 is formed for x ≥ 0.05 with cubic structure (a = 8.3694 Å) and its concentration increases with x. Moreover, XRD analysis reveals the wurtzite hexagonal crystal structure for ZnO. The lattice parameters (a and c) of Zn1-xMnxO are calculated and they increase with the doping concentration of Mn as a consequence of the larger ionic size of Mn2+ ions compared to Zn2+ ions. The crystallite size is calculated for all the samples using Debye– Scherrer's method (SSM), Williamson–Hall methods (UDM, USDM and UDEDM) and SizeStrain Plot method (SSP), and the results are in good agreement with TEM. The presence of functional groups and the chemical bonding is confirmed by FTIR spectra that shows a peak shift between undoped and doped ZnO. The energy bandgap (Eg) is calculated for different concentrations of Mn (0.00 ≤ x ≤ 0.10) by using the UV-visible optical spectroscopy, between 300 nm and 800 nm, showing a noticeable drop in Eg with x. At room temperature, the magnetization of the samples reveals the intrinsic ferromagnetic (FM) behavior of undoped ZnO, ferromagnetic behavior of ZnxMn1-xO (0.01 ≤ x ≤ 0.03) and the co-existence of ferromagnetic and paramagnetic behavior for ZnxMn1-xO (0.05 ≤ x ≤ 0.10). This ferromagnetism is decreased for the doped samples as a consequence of antiferromagnetic coupling between Mn ions. The two samples correspond to x = 0.01 and x = 0.10, tend to be superparamagnetic because of the formation of single domain particles as a consequence of small particle size. x = 0.03 shows an optimum value of Mn concentration for maximum saturation magnetization and the best ferromagnetic nature.
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