Influence of Calcinations Temperatures on Structural and Photoluminescence Properties of ZnO Nanoparticles via Precipitation Method

2011 ◽  
Vol 364 ◽  
pp. 510-514 ◽  
Author(s):  
M.D. Johan Ooi ◽  
Azlan Abdul Aziz ◽  
M.J. Abdullah
Keyword(s):  
Zno Nanoparticles ◽  
Optical Characteristic ◽  
Chelating Agent ◽  
Emission Peak ◽  
Precipitation Method ◽  
Photoluminescence Properties ◽  
Violet Emission ◽  
Heat Treated ◽  
Close Relationship ◽  
Violet Emission Peak

Zinc oxide (ZnO) nanoparticles with spherical morphologies were successfully produced via precipitation of Zn and I2 with DEA was employed as a chelating agent. The products were further heat treated at four different calcinations temperature commences from 250 °C to 1150 °C. Studies on ZnO structural, morphologies and optical characteristic with respect to calcinations temperatures were conducted using XRD, TEM and PL spectroscopy respectively. The XRD spectra reveal hexagonal wurtzite signature along with preferred orientation growth in (101) plane. Particles size of ~ 60 nm and strong blue-violet emission peak of 417 nm (3.0 eV) has been observed for ZnO calcined at 850 ᵒC. Results reveal a close relationship between the calcinations temperature and ZnO microstructure whereas, its luminescence behaviour showing a strong depending on ZnO microstructure.

Violet emission from Fe doped ZnO nanoparticles synthesized by precipitation method

2016 ◽  
Vol 176 ◽  
pp. 6-14 ◽  
Author(s):  
S. Kanchana ◽  
M. Jay Chithra ◽  
Suhashini Ernest ◽  
K. Pushpanathan
Keyword(s):  
Zno Nanoparticles ◽  
Precipitation Method ◽  
Violet Emission ◽  
Doped Zno

scholarly journals Study on influences of Sb doping content on the defects of ZnO film by photoluminescence (PL) spectrum and raman scattering spectrum

2015 ◽  
Vol 18 (3) ◽  
pp. 78-84
Author(s):  
Tuan Anh Dao ◽  
Quang Nhat Nguyen ◽  
Loan Nguyen Phuong Vuong ◽  
Hung Vu Tuan Le
Keyword(s):  
Raman Scattering ◽  
Emission Peak ◽  
Zno Thin Film ◽  
Raman Scattering Spectrum ◽  
Zno Film ◽  
Violet Emission ◽  
Scattering Spectrum ◽  
Sb Doping ◽  
Doped Zno ◽  
Violet Emission Peak

Sb-doped ZnO thin films with different values of Sb concentrations are deposited on glass substrate by using spin-coating technique. The influences of Sb doping content on the microstructural, photoluminescence and Raman properties of ZnO film are systematically investigated by X-ray diffraction (XRD), transmission spectrum, photoluminescence (PL) spectrum and Raman scattering spectrum. The results indicate that ZnO thin film doped with Sb exhibits a hexagonal wurtzite structure with preferred c-axis orientation. The strong violet emission peak located at 3.11 eV is observed in the Sb-doped ZnO thin film by photoluminescence. Conbining the Raman scattering spectrum with photoluminescence, it is concluded that the strong violet emission peak related to SbZn-O complex defect in ZnO:Sb film.

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.

Solubility Enhancement of Fe in ZnO Nanoparticles Prepared by Co-Precipitation Method

2021 ◽  
Author(s):  
Muhammad Musharaf ◽  
Shumaila Karamat ◽  
Muhammad Umair Hassan ◽  
Uzma Khalique ◽  
Ahmet Oral ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Solubility Enhancement ◽  
Precipitation Method ◽  
Co Precipitation

Self-assembled ZnO nanoparticles on ZnO microsheet: ultrafast synthesis and tunable photoluminescence properties

2015 ◽  
Vol 48 (22) ◽  
pp. 225305 ◽  
Author(s):  
Sanjaya Brahma ◽  
Jayakrishna Khatei ◽  
S Sunkara ◽  
K-Y Lo ◽  
S A Shivashankar
Keyword(s):  
Zno Nanoparticles ◽  
Photoluminescence Properties ◽  
Self Assembled

Scheelite (CaWO4)-type microphosphors: Facile synthesis, structural characterization and photoluminescence properties

2016 ◽  
Vol 30 (32n33) ◽  
pp. 1650400 ◽  
Author(s):  
Yuanyuan Han ◽  
Dan Wang ◽  
Danyang Liang ◽  
Shiqi Wang ◽  
Guoxin Lu ◽  
...  
Keyword(s):  
Luminescence Decay ◽  
Precipitation Method ◽  
Ammonium Bromide ◽  
Photoluminescence Properties ◽  
Facile Synthesis ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Broad Emission ◽  
Transition Formula ◽  
Cetyltrimethyl Ammonium ◽  
Uv Excitation

Scheelite (CaWO4)-type microphosphors were synthesized by the precipitation method assisted with cetyltrimethyl ammonium bromide (CTAB). All compounds crystallized in the tetragonal structure with space group [Formula: see text] (No. 88). FE-SEM micrographs illustrate the spherical-like morphologies and rough surface. PL spectra indicate the broad emission peak maximum at 613 nm under UV excitation. Luminescence decay curves monitored by [Formula: see text] transition ([Formula: see text] nm) of Eu[Formula: see text] in doped CaWO4 are presented, the curves exhibit a single-exponential feature and the lifetime for doped CaWO4 is 0.61 ms.

Photocatalytic Degradation of Synthetic Sulfur Pollutants in Petroleum Fractions under Different pH and Photocatalyst

2021 ◽  
Vol 02 (01) ◽  
Author(s):  
Mohamad Alif Hakimi Hamdan ◽  
◽  
Nur Hanis Hayati Hairom ◽  
Nurhafisza Zaiton ◽  
Zawati Harun ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Zno Nanoparticles ◽  
Low Cost ◽  
Industrial Effluents ◽  
Degradation Process ◽  
Vital Role ◽  
Petroleum Fraction ◽  
Precipitation Method ◽  
Synthesis Process ◽  
Petroleum Fractions

Thiophene is one of the sulfur compounds in the petroleum fraction that can be harmful to living things and lead to a critical effect on the ecosystem. Photocatalytic degradation is one of the promising methods in treating wastewater as it can mineralization of pollutants into carbon dioxide and water. Other than that, this method is non-toxic and relatively low cost. The production of hydroxyl radicals playing a vital role in the degradation of organic pollutants. It has been claimed that the usage of zinc oxide (ZnO) nanoparticles could give an excellent degradation process as this photocatalyst have high photosensitivity, low cost and chemically stable. However, the preparation method of ZnO nanoparticles will affect the agglomeration, particle size, shape and morphology of particles and lead to influence the photocatalytic activity in degrading thiophene. Therefore, this study focused on the effectiveness of ZnO nanoparticles in the presence of fibrous nanosilica (KCC-1) and polyethylene glycol (PEG) as the capping agent to degrade synthetic thiophene. ZnO/KCC-1 had been synthesized via the precipitation method and characterized by using Fourier Transform Infrared (FTIR). The chemical bond and nature of the photocatalyst from the FTIR results proved that the synthesis process to produce the ZnO/KCC-1 was succeed. The large surface area of KCC-1 increases the effectiveness of ZnO which is supported by the experimental data. Accordingly, the optimum condition for photocatalytic degradation of thiophene is under pH 7 by using ZnO/KCC-1 as photocatalyst. Hence, it is believed that this research could be implemented to remove the thiophene in petroleum fraction from the actual industrial effluents and this can preserve nature in the future.

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