PREPARATION AND MICROSTRUCTURAL CHARACTERIZATION OF NANOCRYSTALLINE Mn-DOPED ZnO

NANO ◽  
2011 ◽  
Vol 06 (04) ◽  
pp. 379-385 ◽  
Author(s):  
B. ROY ◽  
O. MONDAL ◽  
A. DEB ◽  
S. P. SENGUPTA ◽  
P. CHATERJEE ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Rietveld Method ◽  
Spinel Phase ◽  
Microstructural Characterization ◽  
Average Particle ◽  
Diffusional Growth ◽  
Chemical Route ◽  
Doped Zno ◽  
Mn Concentration ◽  
Mn Doped

Mn -doped ZnO , a dilute magnetic semiconductor (DMS), has been prepared in nanocrystalline form by using a soft chemical route. The concurrent diffusional growth of both nanocrystalline Mn -doped ZnO and secondary spinel phase ZnMn2O4 in annealed samples have been studied by using a modified Rietveld method and transmission electron microscope (TEM). Rietveld analysis reveals that both the compounds start growing when Mn concentration is lower and the volume fraction of crystalline spinel phase ZnMn2O4 decreases sharply when Mn concentration increases. TEM study indicates that average particle sizes of both the phases are in nanometer dimensions and are highly crystalline in nature. Magnetization increases initially and then almost saturates with the increase of Mn concentration. The enhanced magnetization could be a combined effect of Mn ions and surface ferromagnetism of nanoparticles.

Correlating the magnetism and gas sensing properties of Mn-doped ZnO films enhanced by UV irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (31) ◽  
pp. 26227-26238 ◽  
Author(s):  
David E. Motaung ◽  
Ioannis Kortidis ◽  
Gugu H. Mhlongo ◽  
Mart-Mari Duvenhage ◽  
Hendrik. C. Swart ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Gas Sensing ◽  
Zno Films ◽  
Schematic Diagram ◽  
Sensing Properties ◽  
Tof Sims ◽  
Gas Sensing Properties ◽  
Doped Zno ◽  
Mn Concentration ◽  
Mn Doped

Schematic diagram showing the 2D TOF SIMS overlays of Si+, Mn+and Zn+. The insert corresponds to the correlation between the sensing response and FMR signal as a function of Mn concentration when exposed to various gases.

Influence of Mn Doping on Structural and Vibrational Properties of Self-Assembled Mn Doped ZnO Nanocrystals

2008 ◽  
Vol 8 (8) ◽  
pp. 4263-4267 ◽  
Author(s):  
K. C. Barick ◽  
D. Bahadur
Keyword(s):  
Lattice Site ◽  
Mass Force ◽  
X Ray Diffraction ◽  
Infrared Band ◽  
Zno Nanocrystals ◽  
Diffraction Peaks ◽  
Doped Zno ◽  
Surface Phonon Mode ◽  
Mn Concentration ◽  
Mn Doped

Nanocrystallites (15–25 nm) of Mn doped ZnO prepared by refluxing their acetate precursors in the presence of diethylene glycol, self-assemble into polydisperse spheres of broad size distributation (100–400 nm). The center of X-ray diffraction peaks shifts towards lower angle and the line gets broadened on increasing Mn concentration. Compared to the vibration modes of wurtzite ZnO, one additional vibration mode is observed in the range of 522–518 cm−1 in Raman spectra of Mn doped ZnO whose intensity increases on increasing the Mn concentration. The origin of this peak could be related to the incorporation of Mn2+ in Zn2+ lattice site. Further, on increasing Mn concentration, infrared band red shifted and surface phonon mode absorption get pronounced due to the incorporation of Mn2+ in Zn2+ lattice site resulting changes in the local structure parameters (effective mass, force constant, bond length).

Influence of the Mn concentration on the electromechanical response d33 of Mn-doped ZnO films

2010 ◽  
Vol 4 (8-9) ◽  
pp. 209-211 ◽  
Author(s):  
J. T. Luo ◽  
X. Y. Zhu ◽  
G. Chen ◽  
F. Zeng ◽  
F. Pan
Keyword(s):  
Zno Films ◽  
Doped Zno ◽  
Mn Concentration ◽  
Mn Doped

scholarly journals Room temperature ferromagnetic behavior in the nanocrystals of Fe doped ZnO synthesized by soft chemical route

2019 ◽  
Vol 37 (3) ◽  
pp. 364-372
Author(s):  
L. V. Bhandarkar
Keyword(s):  
Calcination Temperature ◽  
Spinel Phase ◽  
Secondary Phase ◽  
Nanocrystalline Phase ◽  
Ferromagnetic Behavior ◽  
Unusual Behavior ◽  
Chemical Route ◽  
Doped Zno ◽  
Zno Powder ◽  
Soft Chemical Route

AbstractIn the present study, nanocrystalline undoped and Fe (5 wt.%) doped ZnO powder has been synthesized by soft chemical route. The structural, nano/microstructural, vibrational and magnetic properties of these samples have been studied as a function of calcination temperature (400 °C to 1100 °C). X-ray diffraction analysis of Fe doped ZnO powder has shown the major nanocrystalline wurtzite (ZnO) phase and the minor cubic spinel-like secondary nanocrystalline phase at 700 °C. At calcination temperature of 700 °C, the magnetization and coercivity have been enhanced in Fe doped ZnO. As the calcination temperature increased to 1100 °C, the major phase of ZnO and minor cubic spinel-like secondary phase turned into bulk in doped ZnO. Interestingly, the reduced magnetization and zero coercivity have been observed in this case. These changes are attributed to the conversion of secondary nanocrystalline ferromagnetic spinel phase to its bulk paramagnetic phase. The degree of inversion i.e. the occupancy of both sites with different symmetry by ferric ions is proposed to be solely responsible for the unusual behavior.

Intrinsic Ferromagnetism in Nanocrystalline Mn-Doped ZnO Depending on Mn Concentration

2011 ◽  
Vol 11 (4) ◽  
pp. 3399-3404
Author(s):  
Munisamy Subramanian ◽  
Masaki Tanemura ◽  
Takehiko Hihara ◽  
Tetsuo Soga ◽  
Takashi Jimbo
Keyword(s):  
Intrinsic Ferromagnetism ◽  
Doped Zno ◽  
Mn Concentration ◽  
Mn Doped

EFFECT OF Mn DOPING ON MICROSTRUCTURE AND OPTICAL PROPERTIES OF NANOCRYSTALLINE ZnO

NANO ◽  
2013 ◽  
Vol 08 (06) ◽  
pp. 1350058 ◽  
Author(s):  
M. KARMAKAR ◽  
O. MONDAL ◽  
B. ROY ◽  
P. K. PAUL ◽  
M. PAL
Keyword(s):  
Single Phase ◽  
Rietveld Analysis ◽  
Optical Bandgap ◽  
X Ray ◽  
Transmission Electron ◽  
Doped Zno ◽  
Ceramic Route ◽  
Mn Concentration ◽  
Mn Doped ◽  
Definite Role

Mn -doped ZnO has emerged as the most studied system for prototype applications in spintronics devices because of its interesting magnetic properties. In this report, nanocrystalline ZnO doped with various concentration of Mn have been synthesized from different precursors using modified ceramic route. Samples are characterized by using X-ray diffractometer (XRD), high resolution transmission electron microscopy (HRTEM) and UV-Vis spectrophotometer. XRD and HRTEM studies confirm the growth of single phase, well crystallized Mn -doped ZnO nanoparticles. Particle size estimated from Rietveld analysis as well as TEM images show a decreasing tendency with the increase in Mn concentration. We observe both band bowing and red shift in optical bandgap by varying the concentration of Mn and precursors. This study demonstrates that Mn concentration is not the only factor but precursors have a definite role on the variation of optical bandgap.

scholarly journals Effect of Mn Doping on The Structural, Optical, Magnetic Properties and Antibacterial Activity of ZnO Nanospheres

2021 ◽  
Author(s):  
EBENEZAR JEYASINGH ◽  
Kelvin Adaikalam Charles ◽  
Pandiyarajan Thangaraj ◽  
Karthikeyan Chandrasekaran ◽  
Mangalaraja Ramalinga Viswanathan
Keyword(s):  
Zinc Oxide ◽  
Oxygen Vacancies ◽  
Average Particle Size ◽  
Antibacterial Properties ◽  
Ferromagnetic Phase ◽  
Average Particle ◽  
Zno Nps ◽  
Mn Doping ◽  
Doped Zno ◽  
Mn Doped

Abstract In this work, a systematic study of structural, optical, magnetic and antibacterial properties of Mn doped ZnO has been investigated. Zinc oxide (ZnO) and Mn2+ doped zinc oxide (ZnMnO) nanoparticles (NPs) were prepared through co-precipitation method. The X-ray diffraction studies confirmed that the synthesize nanoparticles did not modify the crystal structure upon Mn doping, but the microstructural parameters were changed considerably while increasing the concentration of Mn dopant. The HRTEM images showed that the ZnO NPs were exhibited nanospheres like morphology and a reduction in the average particle size from 41 nm to 33 nm were observed upon Mn2+ doping. The elemental composition of Zn, Mn and O atoms were identified by EDAX spectra. The Zn-O stretching bands were observed at 539 and 525cm-1 in the FTIR spectra and, the zinc and oxygen vacancies defects were confirmed by PL spectra. From the UV-Vis spectra, the band gap was estimated as 2.7 eV for pure and 2.9 eV for Mn doped ZnO NPs. The Mn doped ZnO NPs showed greater antibacterial effect than the pure ZnO NPs. The magnetization measurements for Mn doped ZnO samples under room temperature ferromagnetism (RTFM) showed the ferromagnetic phase that could originated from the interactions between Mn2+ ions and oxygen vacancies and the defects incorporated in the ZnO matrix.

SYNTHESIS OF Mn-DOPED ZnS AND THE DOPANT-INDUCED PHOTOLUMINESCENCE PROPERTY

2008 ◽  
Vol 17 (02) ◽  
pp. 205-212 ◽  
Author(s):  
NGUYEN MINH THUY ◽  
DO THI SAM ◽  
TRAN MINH THI ◽  
NGUYEN THE KHOI
Keyword(s):  
Single Phase ◽  
Average Particle Size ◽  
Photoluminescence Property ◽  
Solubility Limit ◽  
Average Particle ◽  
Photoluminescence Intensity ◽  
Solid Solubility Limit ◽  
Wet Chemical ◽  
Mn Concentration ◽  
Mn Doped

In this paper, we present our study of optical properties of ZnS and ZnS : Mn at 0–12 at. % concentration Mn 2+ prepared by the wet chemical method. All the resulting ZnS samples are of the single phase with sphalerite crystal structure. The average particle size is about 5–10 nm. The photoluminescence intensity of samples is shown to increase with increasing Mn concentration, reaching a maximum at the solid solubility limit of Mn 2+ in ZnS .

Influence of Doping Concentrations of Sol Gel Derived Zn1-xMnxO Thin Films

2011 ◽  
Vol 403-408 ◽  
pp. 753-757
Author(s):  
Affa Rozana Abdul Rashid ◽  
P. Susthitha Menon ◽  
Sahbudin Shaari
Keyword(s):  
Band Gap ◽  
Annealing Temperature ◽  
Dopant Concentration ◽  
Sol Gel ◽  
Zno Films ◽  
Gap Characteristics ◽  
Doped Zno ◽  
Mn Concentration ◽  
Mn Doped ◽  
Tunable Band Gap

Undoped and Mn doped ZnO films with different percentage of doping concentration (2%, 4%, 6% and 8%) were synthesized by sol gel method with an annealing temperature of 400°C. As to investigate the physical properties and microstructures, the samples are characterized using FESEM. The surface morphology images on the films showed many spherical shaped nanoparticles and separate uniformly. Meanwhile, the optical properties were characterized using UV-Vis where the transmittance and band gap value were affected by certain amount of Mn concentration. These films achieve tunable band gap characteristics by means of changing the dopant concentration. At lower concentration, 2% and 4% of Mn, the band gap is reducing compare to undoped ZnO. At higher doping for 6% and 8% of Mn, the bang gap suddenly increased.

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