Preparation of ZnO Powder from Clinker Digestion Solution of Zinc Oxide Ore

2014 ◽  
Vol 1004-1005 ◽  
pp. 665-669
Author(s):  
Hong Mei Shao ◽  
Xiao Yi Shen ◽  
Zhi Meng Wang ◽  
Yu Chun Zhai
Keyword(s):  
Thermal Decomposition ◽  
Zinc Oxide ◽  
Reaction Temperature ◽  
Narrow Range ◽  
Hexagonal Structure ◽  
Spherical Particles ◽  
Zinc Carbonate ◽  
Digestion Solution ◽  
Zno Powders ◽  
Zno Powder

The ZnO powder was successfully obtained by calcining the basic zinc carbonate, which was synthesized from clinker digestion solution of zinc oxide ore using analytical Na2CO3. The factors of mol ratio of Na2CO3to ZnSO4and reaction temperature were discussed at stirring intensity 400 rpm. Both the obtained basic zinc carbonate and ZnO powders were characterized using XRD, EDS and SEM. The thermal decomposition of basic zinc carbonate was also investigated below 600°C. The results show that the ZnO powder was wurzite hexagonal structure and the well-crystallized ZnO powder was uniformly spherical particles and distributed in a narrow range.

Research on Preparation, Characterization of Novel Nano-ZnO

2011 ◽  
Vol 311-313 ◽  
pp. 549-554
Author(s):  
Yan Yan Liu ◽  
Dian Mo Zheng
Keyword(s):  
Thermal Decomposition ◽  
Zinc Oxide ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Zinc Acetate ◽  
Average Particle Size ◽  
Molar Ratio ◽  
Average Particle ◽  
Acetate Solution ◽  
Nano Zno

Zinc acetate and ammonium bicarbonate are used as raw material, zinc oxide prepared by direct precipitation of new technology. This paper discusses the effection of the formation in zinc oxide from the reactant concentration of zinc acetate, HCO3-/Zn2+ molarity ratio, reaction temperature, reaction time and condition in thermal decomposition of basic zinc carbonate. Using transmission electron microscopy (TEM), thermogravimetric / differential thermal analysis (TG / DTA) and other methods, preparation of nano-ZnO are characterized. Good conditions for the better system of nano- ZnO are 0.75mol /L in the concentration of zinc acetate solution, 2.5:1 in bicarbonate of ammonia and zinc acetate molar ratio, 45 °C of reaction temperature, 1.0h of reaction time, and 350 °C in thermal decomposition temperature, 3.0h of pyrolysis time. Zinc oxide obtained average particle size is 20 ~ 80nm, for the hexagonal crystal form.

Synthesis of Zno Nanoparticles by Thermal Decomposition of Basic Zinc Carbonate

2013 ◽  
Vol 58 (2) ◽  
pp. 489-491 ◽  
Author(s):  
B. Hutera ◽  
A. Kmita ◽  
E. Olejnik ◽  
T. Tokarski
Keyword(s):  
Thermal Decomposition ◽  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Xrd Analysis ◽  
Scanning Microscopy ◽  
Zinc Carbonate

The paper presents a method for obtaining nanoparticles of ZnO by thermal decomposition of the Zn-containing compounds. The experiment was based on the thermal decomposition of basic zinc carbonate to zinc oxide (with a content of 58-61 wt.%). Basic zinc carbonate was analysed by derivatography and then annealed at a selected temperature (about 600ºC) for about 1 h. Products of thermal decomposition of the compound were studied by XRD analysis and SEM scanning microscopy.

scholarly journals Facile synthesis of a zinc oxide nanoparticle by electrochemical method

2014 ◽  
Vol 10 (3) ◽  
Author(s):  
Aishah Abdul Jalil ◽  
Sugeng Triwahyono ◽  
Nur Hanis Hayati Hairom ◽  
Nurul Aini Mohamed Razali
Keyword(s):  
Zinc Oxide ◽  
Supporting Electrolyte ◽  
Electron Transition ◽  
Hexagonal Structure ◽  
Electrochemical Process ◽  
Bet Surface Area ◽  
Zinc Anode ◽  
Transmission Electron ◽  
Platinum Cathode ◽  
Zno Powder

An electrogenerated zinc oxide (EGZnO/Naph) nanoparticle was successfully synthesized by electrolysis of a N,N-dimethylformamide (DMF) solution containing naphthalene and a supporting electrolyte in a one-compartment cell fitted with a platinum cathode and a zinc anode. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that the EGZnO/Naph consists of pure single crystalline wurtzite of hexagonal structure with average diameters of 10-15 nm. The BET surface area of the EGZnO/Naph was 65 m2/g, which is 15 times larger than that of commercial ZnO powder. The zinc oxide was also confirmed by Fourier transform infrared (FTIR) results which showed vibrational bands at 500 and 434 cm−1. Furthermore, the absorption peak of the EGZnO/Naph obtained at 366 nm (3.35 eV), is very close to the band gap of the ZnO 1s–1s electron transition (3.37 eV). Based on these results, this study reports a new pathway to synthesize nanosize of ZnO particle using a simple electrochemical process.________________________________________GRAPHICAL ABSTRACT

Structural and Optical Properties of Nanocrystalline ZnO Powder by a Direct Thermal Decomposition Route Using Zinc Acetate Dihydrate

2014 ◽  
Vol 979 ◽  
pp. 151-154
Author(s):  
Weeranuch Kaewwiset ◽  
Tarinee Srisuphang ◽  
Sasiprapa Keawsomrong ◽  
Sutthipoj Sutthana ◽  
Supphadate Sujinnapram
Keyword(s):  
Thermal Decomposition ◽  
Optical Properties ◽  
Crystallization Temperature ◽  
Zinc Acetate ◽  
Zinc Acetate Dihydrate ◽  
Acetate Dihydrate ◽  
Structural And Optical Properties ◽  
Different Temperatures ◽  
Zno Powders ◽  
Zno Powder

The nanocrystalline ZnO powders were synthesized by a direct thermal decomposition using zinc acetate dihydrate as starting materials. The precursor was characterized by TG-DTA to determine the thermal decomposition and crystallization temperature which was found to be at 300 °C. The precursors were calcined at different temperatures of 400, 500, and 600 °C for 4 h. The structure of the prepared samples was studied by XRD, confirming the formation of wurtzite structure. The synthesized powders exhibited the UV absorption below 400 nm (3.10 eV) with a well defined absorption peak at around 285 nm (4.35 eV). The estimated direct bandgaps were obtained to be 3.19, 3.16, and 3.14 eV for the ZnO samples thermally decomposed at 400, 500, and 600°C, respectively.

Facile synthesis of zinc carbonate and zinc oxide nanoparticles via direct carbonation and thermal decomposition

2013 ◽  
Vol 39 (1) ◽  
pp. 819-827 ◽  
Author(s):  
Mojtaba Shamsipur ◽  
Seied Mahdi Pourmortazavi ◽  
Seiedeh Somayyeh Hajimirsadeghi ◽  
Mir Mahdi Zahedi ◽  
Mehdi Rahimi-Nasrabadi
Keyword(s):  
Thermal Decomposition ◽  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Facile Synthesis ◽  
Zinc Carbonate

A precise determination of the shape, size and distribution of size of crystallites in zinc oxide by X-ray line-broadening analysis

1983 ◽  
Vol 16 (2) ◽  
pp. 183-191 ◽  
Author(s):  
D. Louër ◽  
J. P. Auffrédic ◽  
J. I. Langford ◽  
D. Ciosmak ◽  
J. C. Niepce
Keyword(s):  
Thermal Decomposition ◽  
Zinc Oxide ◽  
Cross Section ◽  
Precise Determination ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Peaks ◽  
Zno Powder

The Fourier and variance methods are used to analyse the breadths of X-ray diffraction peaks from ZnO powder obtained from the thermal decomposition of Zn3(OH)4(NO3)2. The shape, size, distribution of size and orientation of the crystallites are determined. It is found that the form is markedly anisotropic and that on average the crystallites may be regarded as cylinders with a diameter of about 110 Å and height about 240 Å, but that they are in fact right prisms whose cross section is an irregular hexagon. There is excellent agreement between the experimental results and the predictions of line-broadening theory, with quantitative confirmation from electron micrographs of the sample.

Synthesis and Characterization of Nanocrystalline ZnO Powders by a Direct Thermal Decomposition Route Using Zinc Nitrate Hexahydrate

2013 ◽  
Vol 770 ◽  
pp. 68-71 ◽  
Author(s):  
Supphadate Sujinnapram ◽  
Uraiphorn Termsuk ◽  
Atcharawan Charoentam ◽  
Sutthipoj Sutthana
Keyword(s):  
Thermal Decomposition ◽  
Crystallization Temperature ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Absorption Peak ◽  
Synthesis And Characterization ◽  
Nitrate Hexahydrate ◽  
Different Temperatures ◽  
Zno Powders

The nanocrystalline ZnO powders were synthesized by a direct thermal decomposition using zinc nitrate hexahydrate as starting materials. The precursor was characterized by TG-DTA to determine the thermal decomposition and crystallization temperature which was found to be at 325 oC. The precursors were calcined at different temperatures of 400, 500, and 600°C for 4 h. The structure of the prepared samples was studied by XRD, confirming the formation of wurtzite structure. The synthesized powders exhibited the UV absorption below 400 nm (3.10 eV) with a well defined absorption peak at around 285 nm (4.35 eV). The estimated direct bandgaps were obtained to be 3.19, 3.16, and 3.14 eV for the ZnO samples thermally decomposed at 400, 500, and 600°C, respectively.

Characteristics of Zinc Oxide Film Prepared by Chemical Bath Deposition Method

2014 ◽  
Vol 602-603 ◽  
pp. 871-875
Author(s):  
Yen Pei Fu ◽  
Jian Jhih Chen
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Chemical Bath Deposition ◽  
Deposition Time ◽  
Oxide Films ◽  
Hexagonal Structure ◽  
Zno Films ◽  
Zinc Oxide Film ◽  
Incident Wavelength ◽  
Zinc Oxide Films

In this study, ZnO films, prepared by Chemical Bath Deposition (CBD), are applied as the conductive layers for thin film solar cells. Zinc acetate is used as a source of zinc, and different proportions of ammonia solution are added and well mixed. The growth of zinc oxide films in reaction solutions is taken place at 80°C and then heated to 500°C for one hour. In this study, the different ammonia concentrations and deposition times is controlled. The thin film structure is Hexagonal structure, which is determined by X-ray diffraction spectrometer (XRD) analysis. Scanning electron microscopy (SEM) is used as the observation of surface morphology, the bottom of the film is the interface where the heterogeneous nucleation happens. With the increase of deposition time, there were a few attached zinc oxide particles, which is formed by homogeneous nucleation. According to UV / visible light (UV / Vis) absorption spectrometer transmittance measurements and the relationship between/among the incident wavelength, it can be converted to the energy gaps (Eg), which are about 3.0 to 3.2eV, by using fluorescence spectroscopy analysis. The emission of zinc oxide films has two wavelengths which are located on 510nm and 570nm. According to Based on the all analytic results, the ammonia concentration at 0.05M, and the deposition time is 120 minutes, would obtain the conditions of ZnO films which is more suitable for applications of conductive layer material in thin film solar cell.

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