Role of Sm3+ Doping on Structural, Optical and Photoluminescence Properties of ZnO Nanoparticles Synthesized by Sol-gel Auto- combustion Method

2020 ◽  
Vol 5 (3) ◽  
pp. 236-251
Author(s):  
Eshwara I. Naik ◽  
Halehatty S.B. Naik ◽  
Ranganaik Viswanath
Keyword(s):  
Zno Nanoparticles ◽  
Sol Gel ◽  
Combustion Method ◽  
Content Increase ◽  
Photoluminescence Properties ◽  
Tem Analysis ◽  
Auto Combustion ◽  
Ion Doping ◽  
Doped Zno ◽  
Pl Intensity

Background: Various interesting consequences are reported on structural, optical, and photoluminescence properties of Zn1-xSmxO (x=0, 0.01, 0.03 and 0.05) nanoparticles synthesized by sol-gel auto-combustion route. Objective: This study aimed to examine the effects of Sm3+-doping on structural and photoluminescence properties of ZnO nanoparticles. Methods: Zn1-xSmxO (x=0, 0.01, 0.03 and 0.05) nanoparticles were synthesized by sol-gel auto combustion method. Results: XRD patterns confirmed the Sm3+ ion substitution through the undisturbed wurtzite structure of ZnO. The crystallite size was decreased from 24.33 to 18.46 nm with Sm3+ doping. The hexagonal and spherical morphology of nanoparticles was confirmed by TEM analysis. UV-visible studies showed that Sm3+ ion doping improved the visible light absorption capacity of Sm3+ iondoped ZnO nanoparticles. PL spectra of Sm3+ ion-doped ZnO nanoparticles showed an orange-red emission peak corresponding to 4G5/2→6HJ (J=7/2, 9/2 and 11/2) transition of Sm3+ ion. Sm3+ ion-induced PL was proposed with a substantial increase in PL intensity with a blue shift in peak upon Sm3+ content increase. Conclusion: Absorption peaks associated with doped ZnO nanoparticles were moved to a longer wavelength side compared to ZnO, with bandgap declines when Sm3+ ions concentration was increased. PL studies concluded that ZnO emission properties could be tuned in the red region along with the existence of blue peaks upon Sm3+ ion doping, which also results in enhancing the PL intensity. These latest properties related to Sm3+ ion-doped nanoparticles prepared by a cost-efficient process appear to be interesting in the field of optoelectronic applications, which makes them a prominent candidate in the form of red light-emitting diodes.

scholarly journals Influence of trivalent rare earth (Dy3+) ions substitution on the structural, magnetic and dielectric properties of nanosized Ni0.6Cd0.4DyxFe2‒xO4 ferrites

2020 ◽  
Author(s):  
Hemant Kumar Dubey ◽  
Preeti Lahiri
Keyword(s):  
Dielectric Constant ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Sem Images ◽  
Tem Analysis ◽  
Low Dielectric ◽  
Auto Combustion ◽  
Crystallite Sizes ◽  
High Dielectric

Abstract In the present work, Ni0.6Cd0.4DyxFe2‒xO4 (x = 0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles (NPs) were synthesized by using sol-gel auto combustion method. The structural characterization was performed by XRD, FTIR, SEM, TEM and EDS analyses. XRD patterns confirmed that the pure and dysprosium substituted Ni-Cd ferrites are in single phase spinel structures, while a trace of DyFeO3 appears as a minor phase for higher concentrations (x = 0.10, 0.15 and 0.20). The Debye‒Scherrer’s method and Williamson-Hall (W-H) method were used to evaluate the crystallite sizes and lattice strain. The average crystallite size was found to be in the range from 27 to 48 nm. FT-IR confirms the formation of spinel structure. SEM images show that reduction of grain size with Dy3+ content. Elemental composition features of samples were examined by EDS. The average particles size estimated from TEM analysis are in good agreement with results obtained from the XRD. The results showed that saturation magnetization (Ms) decreases and coercivity (Hc) increases with increase in Dy3+ concentrations. The dielectric constant and the loss tangent decrease rapidly with increasing frequency and then reaches a constant value, characteristic of normal behavior of ferrites. The dielectric constant was found to decrease with increasing Dy content in Ni-Cd ferrites. Ferrite sample with Dy3+ concentration, x = 0.05 show high dielectric constant, low dielectric loss and hence can be utilized in high frequency electrical circuits.

Structure, luminescence and photocatalytic activity of Mg-doped ZnO nanoparticles prepared by auto combustion method

2015 ◽  
Vol 29 ◽  
pp. 372-379 ◽  
Author(s):  
Yajun Wang ◽  
Xiaoru Zhao ◽  
Libing Duan ◽  
Fenggui Wang ◽  
Hongru Niu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Zno Nanoparticles ◽  
Combustion Method ◽  
Auto Combustion ◽  
Doped Zno ◽  
Mg Doped

STRUCTURAL AND MAGNETIC STUDY OF Co-DOPED ZnO NANOPARTICLES SYNTHESIZED BY AUTO COMBUSTION METHOD

2011 ◽  
Vol 10 (04n05) ◽  
pp. 1025-1028 ◽  
Author(s):  
FAHEEM AHMED ◽  
SHALENDRA KUMAR ◽  
NISHAT ARSHI ◽  
M. S. ANWAR ◽  
BON HEUN KOO ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Room Temperature Ferromagnetism ◽  
Visible Region ◽  
Photo Luminescence ◽  
Combustion Method ◽  
Magnetic Studies ◽  
Transmission Electron ◽  
Auto Combustion ◽  
Doped Zno ◽  
Co Doped

In the present work, we have synthesized Zn 1-x Co x O (x = 0.0 ≤ x ≤ 0.1) nanoparticles by an auto-combustion method using C2H5NO2 (glycine) as a fuel. The prepared nanoparticles were characterized by using X-ray diffraction, transmission electron microscopy, Photo-luminescence (PL) and magnetization measurements. XRD and TEM results demonstrated that Co -doped ZnO have a single phase nature with wurtzite structure and Co2+ ions were successfully incorporated into the lattice position of Zn2+ ions in ZnO matrix. PL spectra show two emission bands in visible region. Magnetic studies showed that Co -doped ZnO nanoparticles exhibit room temperature ferromagnetism.

Enhanced room temperature ferromagnetism in Cr-doped ZnO nanoparticles prepared by auto-combustion method

2018 ◽  
Vol 39 (4) ◽  
pp. 043001 ◽  
Author(s):  
Khizar-ul Haq ◽  
M. Irfan ◽  
Muhammad Masood ◽  
Murtaza Saleem ◽  
Tahir Iqbal ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Combustion Method ◽  
Auto Combustion ◽  
Doped Zno

scholarly journals Sol-gel Auto Combustion Synthesis, Structural and Magnetic Properties of Mn doped ZnO Nanoparticles

2018 ◽  
Vol 20 ◽  
pp. 174-180 ◽  
Author(s):  
Shankar D. Birajdar ◽  
R.C. Alange ◽  
S.D. More ◽  
V.D. Murumkar ◽  
K.M. Jadhav
Keyword(s):  
Magnetic Properties ◽  
Combustion Synthesis ◽  
Zno Nanoparticles ◽  
Sol Gel ◽  
Auto Combustion ◽  
Structural And Magnetic Properties ◽  
Doped Zno ◽  
Mn Doped

Microstructure and optical properties of Na-doped ZnO system, synthesized by the sol–gel method

2019 ◽  
Vol 97 (4) ◽  
pp. 254-258 ◽  
Author(s):  
Fan Tong ◽  
Ye Zhao ◽  
Mao-Hua Wang
Keyword(s):  
Electron Microscopy ◽  
Zno Nanoparticles ◽  
Lattice Structure ◽  
Sol Gel ◽  
Average Crystalline Size ◽  
Tem Analysis ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Doped Zno

Pure and Na-doped ZnO (2 at.%, 5 at.%, and 10 at.%) films are synthesized by sol–gel method and annealed at 500 °C for 4 h. The as-synthesized nanoparticles are characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) with energy dispersive X-ray spectroscopy (EDS). The samples exhibited hexagonal ZnO lattice structure and another Na2O2 phase was detected in the 5 at.% Na-doped ZnO sample. The calculated average crystalline size increases from 42.0 nm to 43.5 nm when Na content increased from 0 to 10 at.%. FESEM and TEM analysis identifies that the average size of the Na-doped ZnO nanoparticles lies in between 50 nm and they appear in spheroid-like or rod-like shaped particles. The transmittance of the sample was above 80% and the results of photocatalytic activity show that Na-doped ZnO nanoparticles exhibit higher photodegradation activity (about 91%) than pure ZnO nanoparticles under UV irradiation.

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