scholarly journals Influence of Calcination Temperature on Crystal Growth and Optical Characteristics of Eu3+ Doped ZnO/Zn2SiO4 Composites Fabricated via Simple Thermal Treatment Method

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 115
Author(s):  
Suhail Huzaifa Jaafar ◽  
Mohd Hafiz Mohd Zaid ◽  
Khamirul Amin Matori ◽  
Sidek Hj. Ab Aziz ◽  
Halimah Mohamed Kamari ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Band Gap ◽  
Calcination Temperature ◽  
Emission Intensity ◽  
Emission Spectra ◽  
Treatment Method ◽  
Absorption Bands ◽  
Vis Spectroscopy ◽  
Doped Zno ◽  
Zno Crystal

This research paper proposes the usage of a simple thermal treatment method to synthesis the pure and Eu3+ doped ZnO/Zn2SiO4 based composites which undergo calcination process at different temperatures. The effect of calcination temperatures on the structural, morphological, and optical properties of ZnO/Zn2SiO4 based composites have been studied. The XRD analysis shows the existence of two major phases which are ZnO and Zn2SiO4 crystals and supported by the finding in the FT-IR. The FESEM micrograph further confirms the existence of both ZnO and Zn2SiO4 crystal phases, with progress in the calcination temperature around 700–800 °C which affects the existence of the necking-like shape particle. Absorption humps discovered through UV-Vis spectroscopy revealed that at the higher calcination temperature effects for higher absorption intensity while absorption bands can be seen at below 400 nm with dropping of absorption bands at 370–375 nm. Two types of band gap can be seen from the energy band gap analysis which occurs from ZnO crystal and Zn2SiO4 crystal progress. It is also discovered that for Eu3+ doped ZnO/Zn2SiO4 composites, the Zn2SiO4 crystal (5.11–4.71 eV) has a higher band gap compared to the ZnO crystal (3.271–4.07 eV). While, for the photoluminescence study, excited at 400 nm, the emission spectra of Eu3+ doped ZnO/Zn2SiO4 revealed higher emission intensity compared to pure ZnO/Zn2SiO4 with higher calcination temperature exhibit higher emission intensity at 615 nm with 700 °C being the optimum temperature. The emission spectra also show that the calcination temperature contributed to enhancing the emission intensity.

scholarly journals The Influence of Calcination Temperature on the Formation of Zinc Oxide Nanoparticles by Thermal-Treatment

2013 ◽  
Vol 446-447 ◽  
pp. 181-184 ◽  
Author(s):  
Naif Mohammed Al-Hada ◽  
Elias Saion ◽  
A.H. Shaari ◽  
M.A. Kamarudin ◽  
Salahudeen A. Gene
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
Thermal Treatment ◽  
Band Gap ◽  
Calcination Temperature ◽  
Zinc Oxide Nanoparticles ◽  
Treatment Method ◽  
Band Gap Energy ◽  
Oxide Nanoparticles ◽  
Gap Energy

Zinc oxide nanoparticles were synthesized by the thermal-treatment method. Polyvinyl pyrrolidone was used as capping agent and Zinc nitrate was used as a precursor. The samples were calcined at 500 and 550°C for removal of the organic compounds. The structural characteristics of the calcined samples were examined by X-ray diffraction and transmission electron microscopy. The results show that the average particle size increases with increase in calcination temperature. The optical properties were characterized at room temperature using a UV–Vis spectrophotometer in the wavelength range between 200–800 nm and the band gap energy was calculated from reflectance spectra using kubalka munk function and the results indicated that the band gap energy decreased from 3.23 eV at 500 oC to 3.21 eV at 600 °C due to an increase of particle size. This simple thermal-treatment method has advantages of the pure nanoparticles formation as no additional chemicals were required, a lack of by-product effluents, and environmentally friendly process.

Synthesis, Structural and Optical Properties of Cerium Oxide Nanoparticles Prepared by Thermal Treatment Method

2017 ◽  
Vol 268 ◽  
pp. 132-137 ◽  
Author(s):  
Anwar Ali Baqer ◽  
Khamirul Amin Matori ◽  
Naif Mohammed Al-Hada ◽  
Abdul Halim Shaari ◽  
Elias Saion ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Calcination Temperature ◽  
Treatment Method ◽  
Fluorite Structure ◽  
Band Gap Energy ◽  
Treatment Technique ◽  
Structural And Optical Properties ◽  
Gap Energy ◽  
Calcination Temperatures ◽  
Fesem Micrographs

A sample thermal treatment technique was utilised to synthesis cerium dioxide (CeO2) nanoparticles, using cerium (111) nitrate as a precursor, Polyvinylpyrrolidone as a capping agent, and deionized water as a solvent. The product underwent calcination treatment of 500, 550, 600, and 650 1C to crystallize the nanoparticles and to remove organic compounds. It was verified by XRD that by varying the calcination temperature, the cubic fluorite structure of CeO2 nanoparticles with pure products was achieved. Furthermore, the crystal sizes of the CeO2 nanoparticles were assessed to be 4 nm for the lowest calcination temperature and 23 nm for the highest calcination temperature. The FESEM micrographs of the CeO2 nanoparticles revealed a structure of CeO2 nanospherical that exhibited a tendency to amalgamate at higher calcination temperatures. The optical characteristics that were evaluated with the help of a UV-Vis spectrophotometer indicated a decrease in the band gap energy with an increase in calcination temperature as a result of the increase in the crystal sizes.

scholarly journals Effects of Calcination Holding Time on Properties of Wide Band Gap Willemite Semiconductor Nanoparticles by the Polymer Thermal Treatment Method

Molecules ◽  
2018 ◽  
Vol 23 (4) ◽  
pp. 873 ◽  
Author(s):  
Ibrahim Alibe ◽  
Khamirul Matori ◽  
Hj Sidek ◽  
Yazid Yaakob ◽  
Umer Rashid ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Band Gap ◽  
Wide Band ◽  
Treatment Method ◽  
Semiconductor Nanoparticles ◽  
Holding Time ◽  
Wide Band Gap

Optical Properties of Undoped and Dy3+-Doped Boro-Tellurite Glass

2014 ◽  
Vol 895 ◽  
pp. 194-199 ◽  
Author(s):  
Atiqah Ab Rasid ◽  
Husin Wagiran ◽  
Suhairul Hashim ◽  
Rosli Hussin ◽  
Zuhairi Ibrahim
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Tellurite Glass ◽  
Optical Band Gap ◽  
Band Gap Energy ◽  
Excitation Wavelength ◽  
Absorption Bands ◽  
Gap Energy ◽  
Vis Spectroscopy ◽  
Doped Glasses

A series of undoped and Dy3+-doped boro-tellurite glasses were prepared, and their optical properties have been studied through XRD, absorption, optical band gap energy and photoluminescence. The XRD pattern has been used to confirm the amorphous nature of the prepared glass. The optical absorption spectra showed eight absorption bands which corresponded to 4I15/2, 4F9/2, 6F3/2, 6F5/2, 6F7/2, 6F9/2, 6F11/2 and 6H11/2 transitions from the ground state, 6H15/2. The optical band gap energy, Eopt for undoped glass was 3.08 eV and the Dy3+-doped glasses Eopt values varied from 3.16 3.24 eV. The emission spectra from photoluminescence spectroscopy showed two dominant emission peaks at 483 nm and 574 nm with an excitation wavelength of 325 nm (3.82 eV). Keywords: X-ray diffraction, boro-tellurite glass, photoluminescence, absorption spectrum, UV-Vis spectroscopy, energy band gap.

scholarly journals Enhancing the Optical Properties of Chitosan, Carboxymethyl Cellulose, Sodium Alginate Modified with Nano Metal Oxide and Graphene Oxide

2022 ◽  
Author(s):  
Amina Omar ◽  
Rania Badry ◽  
Maroof A. Hegazy ◽  
Ibrahim S. Yahia ◽  
Hanan Elhaes ◽  
...  
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Band Gap ◽  
Sodium Alginate ◽  
Carboxymethyl Cellulose ◽  
Optical Band Gap ◽  
Filler Content ◽  
Nanocomposite Films ◽  
Absorption Bands ◽  
Vis Spectroscopy

Abstract The solution casting method was utilized to synthesize nanocomposite films of chitosan (Cs)/CuO, Cs/graphene oxide (GO), carboxymethyl cellulose (CMC)/TiO2, CMC/GO, sodium alginate (Na Alg)/TiO2, and Na-Alg/GO owing to their various applications. The influence of CuO, TiO2 and GO concentration on the optical properties of Cs, CMC and Na-Alg films was studied by UV-Vis Spectroscopy. The absorbance of Cs, CMC and Na-Alg increased with increasing the filler content, thus reflecting the dependence of Cs, CMC, and Na-Alg properties on the nanofiller content, and confirming the interactions between individual polymers and CuO, TiO2 and GO nanoparticles. The obtained absorbance values were then used to calculate the absorption coefficient and, hence, the optical band gap values. The characteristic absorption bands of CuO and TiO2 underwent a redshift by increasing the filler content. The results showed that the optical band gap of Cs, CMC, and Na-Alg decreased with filler content, and they possessed 1, 2 and 2 band gaps respectively. The obtained results recommended that Cs, CMC, and Na-Alg nanocomposites can be used in optoelectronic devices.

scholarly journals Structural, Optical, and Magnetic Characterization of Spinel Zinc Chromite Nanocrystallines Synthesised by Thermal Treatment Method

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Salahudeen A. Gene ◽  
Elias Saion ◽  
Abdul H. Shaari ◽  
Mazliana A. Kamarudin ◽  
Naif M. Al-Hada ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Band Gap ◽  
Treatment Method ◽  
Band Gap Energy ◽  
Resonance Spectroscopy ◽  
Magnetic Characterization ◽  
X Ray ◽  
Gap Energy ◽  
Zinc Chromite

The present study reports the structural and magnetic characterization of spinel zinc chromite (ZnCr2O4) nanocrystallines synthesized by thermal treatment method. The samples were calcined at different temperatures in the range of 773 to 973 K. Polyvinylpyrrolidone was used to control the agglomeration of the nanoparticles. The average particle size of the synthesized nanocrystals was determined by powder X-ray diffraction which shows that the crystallite size increases from 19 nm at 773 K to 24 nm at 973 K and the result was in good agreement with the transmission electron microscopy images. The elemental composition of the samples was determined by energy dispersed X-ray spectroscopy which confirmed the presence of Zn, Cr, and O in the final products. Fourier transform infrared spectroscopy also confirmed the presence of metal oxide bands for all the samples calcined at different temperature. The band gap energy was calculated from UV-vis reflectance spectra using the Kubelka-Munk function and the band gap energy of the samples was found to decrease from 4.03 eV at 773 K to 3.89 eV at 973 K. The magnetic properties were also demonstrated by electron spin resonance spectroscopy, the presence of unpaired electrons was confirmed, and the resonant magnetic field and theg-factorof the calcined samples were also studied.

scholarly journals Effects of Calcination Temperature on Microstructure and Superconducting Properties of Y123 Ceramic Prepared Using Thermal Treatment Method

2017 ◽  
Vol 268 ◽  
pp. 325-329 ◽  
Author(s):  
Mustafa Mousa Dihom ◽  
Abdul Halim Shaari ◽  
Hussein Baqiah ◽  
Naif Mohammed Al-Hada ◽  
Soo Kien Chen ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Calcination Temperature ◽  
Sintering Temperature ◽  
Treatment Method ◽  
Impurity Phase ◽  
Superconducting Properties ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Thermal treatment method was employed to produce YBa2Cu3Ox superconductor ceramic. The effects of calcination temperature at 850 °C, set A, and 910 °C, set B, for 24 h followed by sintering at 930, 950 and 980 °C, were investigate using X-ray diffraction (XRD), scanning electron microscope (SEM) and four point probe measurement. The orthorhombic structure appears after calcination at 850 and 910 °C beside small amount of impurity phase such as Y2BaCuO5 (Y211). The samples exhibited metallic behaviour and the critical temperature, TC(R=0), increases with increasing sintering temperature. The TC(R=0) of samples calcined at 910 °C is higher than that of sample calcined at 850 °C. The highest TC(R=0), 87 K, was found for sample sintered at 980 °C of set B. An increase in grain size and homogeneity was observed as the sintering temperature increases. The set B sample sintered at 980 °C showed compact grains, which could result in the highest Tc (R=0).

scholarly journals Structural and Optical Properties of Zirconia Nanoparticles by Thermal Treatment Synthesis

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Aysar S. Keiteb ◽  
Elias Saion ◽  
Azmi Zakaria ◽  
Nayereh Soltani
Keyword(s):  
Particle Size ◽  
Optical Properties ◽  
Thermal Treatment ◽  
Calcination Temperature ◽  
Large Scale ◽  
Homogeneous Solution ◽  
Treatment Method ◽  
Nanocrystalline Powder ◽  
Average Particle ◽  
Zirconia Nanoparticles

Zirconium dioxide nanoparticles with monoclinic blended structure were successfully synthesized by thermal treatment method using zirconium (IV) acetate hydroxide as the metal precursor, polyvinylpyrrolidone as the capping agent, and deionized water as a solvent. The chemicals were mixed and stirred to form a homogeneous solution and hereafter directly underwent calcination to attain the pure nanocrystalline powder, which was confirmed by FTIR, EDX, and XRD analyses. The control over the size and optical properties of nanoparticles was achieved through changing in calcination temperatures from 600 to 900°C. The obtained average particle sizes from XRD spectra and TEM images showed that the particle size increased with increasing calcination temperature. The optical properties which were investigated using a UV-Vis spectrophotometer showed a decrease in the band gap energy with increasing calcination temperature due to the enlargement of the particle size. These results prove that, by eliminating drying process (24 h) in the present thermal treatment method, size-controlled zirconia nanoparticles were conveniently manufactured with a reduction of synthesize time and energy consumption, suitable for large-scale fabrication.

Band Gap Tuning and ac Conductivity of Nanocrystalline Nickel Doped ZnO Synthesized by High Energy Ball Milling

2018 ◽  
Vol 24 (8) ◽  
pp. 5669-5672
Author(s):  
Bikram Keshari Das ◽  
Tanushree Das ◽  
Kajal Parashar ◽  
S. K. S Parashar
Keyword(s):  
Band Gap ◽  
Ball Milling ◽  
Ac Conductivity ◽  
Average Crystallite Size ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Ni Doping ◽  
Vis Spectroscopy ◽  
Energy Ball ◽  
Doped Zno

In the present work, Ni doped ZnO nanoparticles (Zn1−xNixO, x = 0,0.01) has been synthesized by High Energy Ball Milling technique. The synthesized nanoparticles have been characterized by XRD, UV-Vis spectroscopy and LCR meter. The XRD studies revealed that the synthesized nanoparticles are single phase, hexagonal wurtize structure and belongs to a space group of P63 mc. There is shifting of most intense XRD peaks toward higher diffraction angle with Ni doping. The lattice parameter and average crystallite size decreases with Ni doping. Doping of Ni reduces the band gap of ZnO. This is attributed to the sp-d exchange interaction between the ZnO band electrons and localized d electrons of Ni2+ ions. The ac conductivity increases with increase in temperature and frequency, but the value decreases with Ni doping.

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