Structural and optical properties of nanocrystalline Zn1−xMnxO

Samanta, K.; Dussan, S.; Katiyar, Ram S.; Bhattacharya, P.

doi:10.1063/1.2751593

Cited by 120 publications

(94 citation statements)

References 18 publications

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“…Figure 4 shows UV-Visible spectra of Zn 1-x Ni x O (x= 0.0, 0.02, 0.04, 0.06) nanocomposites annealed at 400 o C. Pure ZnO sample shows absorption band edge at 360 nm and observed band edge shows a shift towards higher wavelength side for the nickel doped sample i.e., at 320, 310 and 250 nm. The blue shift of the band edge for the nickel doped sample clearly indicates that Ni 2+ ions are incorporated into the ZnO lattice [29][30][31] which confirms the results of XRD and FTIR results. Optical band gap was evaluated using the equation: (αhν) n = A(hν-E g ) (11) Where α=absorption coefficient, hν=photon energy, A=constant relative to the material and n=2 for direct band gap material or ½ for an indirect band gap material.…”

Section: Xrd Studysupporting

confidence: 75%

Effect of Dopant Concentration on Structural, Optical and Magnetic Properties of Zn1-xNixO Nanocomposites

2018

Chem Sci Trans

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Zn 1-x Ni x O (x=0.0, 0.2, 0.4, 0.6) nanocomposites were synthesized by co-precipitation method and further annealed at 400 o C. Characterization of nanocomposites was carried out by x-ray diffraction (XRD), Fourier transform infra-red spectrometer (FTIR), UV-Visible spectroscopic, vibrating sample magnetometer (VSM) and transmission electron microscope (TEM) techniques. The structural study confirms that nickel (II) ions replace Zn 2+ ions in the ZnO lattice without changing its Wurtzite structure and secondary phase (NiO) was observed with the increase in nickel concentration (x≥0.4). The presence of various functional groups and M-M and M-O chemical bonding were confirmed by FTIR. The optical properties of ZnO nanocrystallities with Ni-doping was investigated by UV-Vis absorption spectra which indicates red shift in the absorption band on Ni-doping. The morphology and structural information were obtained by the TEM images which shows hexagonal nanoparticles with average particle size of 15-50 nm. The change in magnetic behavior of ZnO nanoparticles with varying Ni 2+ doping concentration was investigated by VSM.

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Section: Xrd Studysupporting

confidence: 75%

Effect of Dopant Concentration on Structural, Optical and Magnetic Properties of Zn1-xNixO Nanocomposites

2018

Chem Sci Trans

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“…Therefore, the appearance of the peak at ß523 cm -1 could be used to characterize Mn 2+ doped into ZnO lattice as had been suggested by Zhu et al 53 Moreover, the intensity of the peak at 528 cm −1 is increased with increasing dose of Mn and begins to increase quickly when the dose of Mn is increased. Samanta et al 54 also observed the same.…”

Section: Raman Studiessupporting

confidence: 68%

Structural and Optical Properties of Manganese‐Doped NanocrystallineZinc Oxide/Polyvinylidene Fluoride Flexible Composite Thin Films Deposited by the Sol–Gel Method

et al. 2016

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Mn-doped nanocrystalline ZnO (Mn x Zn 1-x O) was incorporated in the polyvinylidene fluoride thin film for obtaining the free-standing flexible film by the sol-gel technique. The effect of Mn-ZnO loading on the optical and microstructural properties of the Mn-ZnO/polyvinylidene fluoride (PVDF) composite films was studied critically for the as-deposited and the poled samples. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were carried out to study the bonding environment. The XPS spectra recorded for poled samples from the fluorine-terminated surface showed a very strong peak at ß695 eV for F1s arising due to C-F bonds. Raman studies showed the presence of the predominant β phase of PVDF in the sample. Peaks related to ZnO nanocrystals were also observed in the Raman spectra. Photoluminescence spectra indicated a strong emission band at ß2.79 eV in the ultraviolet region arising out of near band edge emission of free excitons. C

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“…Similar ob- servation of enhancement of the band gap of ZnO with Mn 2+ ion concentration was also made earlier by Mandal and Nath and Fukumura et al [26,27]. The crystalline grain sizes of 1%, 3%, 5%, and 10% Mn doped ZnO samples were calculated by the phonon confinement model as 31.8, 18.3, 15.9, and 14.1 nm, respectively by Samanta et al [28]. The group found that the optical band gap increased from 3.27-3.41 eV due to the Mn doping.…”

Section: Transmission and Absorbancementioning

confidence: 77%

Effect of Mn doping on the structural and optical properties of sol-gel derived ZnO nanoparticles

2012

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Abstract:Un-doped and Mn-doped ZnO nanoparticles were successfully synthesized in an ethanolic solution by using a sol-gel method. Material properties of the samples dependence on preparation conditions and Mn concentrations were investigated while other parameters were controlled to ensure reproducibility. It was observed that the structural properties, particle size, band gap, photoluminescence intensity and wavelength of maximum intensity were influenced by the amount of Mn ions present in the precursor. The XRD spectra for ZnO nanoparticles show the entire peaks corresponding to the various planes of wurtzite ZnO, indicating a single phase. The diffraction peaks of doped samples are slightly shifted to lower angles with an increase in the Mn ion concentration, signifying the expansion of the lattice constants and increase in the band gap of ZnO. All the samples show the absorption in the visible region. The absorbance spectra show that the excitonic absorption peak shifts towards the lower wavelength side with the Mn-doped ZnO nanoparticles. The PL spectra of undoped ZnO consist of UV emission at 388 nm and broad visible emission at 560 nm with varying relative peak intensities. The doping of ZnO with Mn quenches significantly the green emission while UV luminescence is slightly affected. 78.55.-m; 78.67.-n PACS (2008):

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Structural and optical properties of nanocrystalline Zn1−xMnxO

Cited by 120 publications

References 18 publications

Effect of Dopant Concentration on Structural, Optical and Magnetic Properties of Zn1-xNixO Nanocomposites

Effect of Dopant Concentration on Structural, Optical and Magnetic Properties of Zn1-xNixO Nanocomposites

Structural and Optical Properties of Manganese‐Doped NanocrystallineZinc Oxide/Polyvinylidene Fluoride Flexible Composite Thin Films Deposited by the Sol–Gel Method

Effect of Mn doping on the structural and optical properties of sol-gel derived ZnO nanoparticles

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