Combustion synthesis of nanocrystalline ZnO powders using zinc nitrate and glycine as reactants—influence of reactant composition

2004 ◽  
Vol 39 (19) ◽  
pp. 6111-6115 ◽  
Author(s):  
Chyi-Ching Hwang ◽  
Tsung-Yung Wu
Keyword(s):  
Combustion Synthesis ◽  
Zinc Nitrate ◽  
Zno Powders

scholarly journals Microwave-Assisted Combustion Synthesis of Nanocrystalline ZnO Powders Using Zinc Nitrate and Various Amount of Organic Fuels as Reactants: Influence of Reactant Parameters - A Status Review

Nano Hybrids ◽  
2014 ◽  
Vol 6 ◽  
pp. 75-110
Author(s):  
L.C. Nehru ◽  
C. Sanjeeviraja
Keyword(s):  
Combustion Synthesis ◽  
Flame Temperature ◽  
Synthesis Method ◽  
Zinc Nitrate ◽  
Adiabatic Flame Temperature ◽  
Molar Ratios ◽  
Microwave Assisted ◽  
Organic Fuels ◽  
Zno Powders ◽  
Xrd Techniques

Nanocrystalline ZnO powders have been synthesized by a novel and simple microwave-assisted combustion synthesis method using urea, glycine, carbohydrazine and citric acid as fuels and zinc nitrate as oxidant. The starting materials were directly mixed and a slurry precursor with high homogeneity was formed due to the hygroscopicity of the reactants. The precursor could be ignited at room temperature, resulting in dry, loose and voluminous ZnO powders. An interpretation based on an adiabatic flame temperature, amount of gases produced during reaction for various fuel-to-oxidizer molar ratios (ψ), has been proposed for the nature of combustion and its correlation with the characteristics of as-synthesized product. The variation of adiabatic flame temperature (Tad) with the ψ value was calculated theoretically according to the thermodynamic concept. The reaction process of the precursor was investigated by XRD techniques.

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.

Solution combustion synthesis of ZnO powders using various surfactants as fuel

2018 ◽  
Vol 89 (2) ◽  
pp. 586-593 ◽  
Author(s):  
H. Vahdat Vasei ◽  
S. M. Masoudpanah ◽  
M. Adeli ◽  
M. R. Aboutalebi
Keyword(s):  
Combustion Synthesis ◽  
Solution Combustion Synthesis ◽  
Solution Combustion ◽  
Zno Powders

Synthesis of ZnO Nanoparticles via Simple Wet-Chemical Routes

2013 ◽  
Vol 699 ◽  
pp. 133-137 ◽  
Author(s):  
Byeong Woo Lee ◽  
Jin Heui Koo ◽  
Tae Suk Lee ◽  
Yun Hae Kim ◽  
Jae Suk Hwang
Keyword(s):  
Single Phase ◽  
Hydrothermal Process ◽  
Processing Parameters ◽  
Zinc Nitrate ◽  
Precursor Concentration ◽  
Precipitation Process ◽  
Process Conditions ◽  
Crystallite Sizes ◽  
Zno Powders ◽  
Wet Chemical

Zinc oxide (ZnO) powders were synthesized by a simple precipitation and a hydrothermal process at the temperature range RT-100°C. In precipitation process, the powders were formed by mixing aqueous solutions of zinc nitrate with NaOH aqueous solution under controlled process conditions such as precursor concentration, reaction pH and temperature. Single phase ZnO particles can be easily synthesized in lower precursor concentration, higher reaction pH and temperature. The powders synthesized at room temperature exhibited plates, rods or pointed multipod morphologies depending on the concentration and pH. ZnO crystallites synthesized by hydrothermal process consisted mostly of well developed large or elongated crystallites of plates or rods in shape. The results reveal that the ZnO crystallite sizes and shapes would be efficiently controllable by changing the processing parameters of the preparation processes.

Synthesis and Characterization of Nanocrystalline ZnO Powders by a Novel Combustion Synthesis Method

2010 ◽  
Vol 152-153 ◽  
pp. 674-678 ◽  
Author(s):  
Bing Wang ◽  
Li Dan Tang ◽  
Jian Zhong Wang
Keyword(s):  
Crystal Structure ◽  
Combustion Synthesis ◽  
Synthesis Method ◽  
Synthesis And Characterization ◽  
Particle Sizes ◽  
Hexagonal Crystal Structure ◽  
Hexagonal Crystal ◽  
Zno Powders ◽  
Scherrer Formula

Nanocrystalline ZnO powders have been synthesized by a novel combustion synthesis method using glycine and urea as mixed fuels and zinc nitrates as oxidant. The as-synthesized ZnO powders are characterized by DSC, XRD and SEM. Results show that the as-synthesized ZnO powders show well crystalline with hexagonal crystal structure and purity without any other impurities and the particle sizes are about 50~70nm calculated by the Scherrer formula.

Effect of fuel content on luminescence and antibacterial properties of zinc oxide nanocrystalline powders synthesized by the combustion method

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 97770-97782 ◽  
Author(s):  
Trilok K. Pathak ◽  
Ashwini Kumar ◽  
C. W. Swart ◽  
H. C. Swart ◽  
R. E. Kroon
Keyword(s):  
Zinc Oxide ◽  
Citric Acid ◽  
Antibacterial Properties ◽  
Combustion Method ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Nanocrystalline Powders ◽  
Nitrate Hexahydrate ◽  
Citric Acid Monohydrate ◽  
Zno Powders

Nanoscale ZnO powders were synthesized via the combustion method using zinc nitrate hexahydrate as the source (oxidant) material and urea, and glycine or citric acid monohydrate as fuels.

scholarly journals Zinc Oxide Synthesis from Extreme Ratios of Zinc Acetate and Zinc Nitrate: Synergistic Morphology

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 570
Author(s):  
Sujittra Kaenphakdee ◽  
Pimpaka Putthithanas ◽  
Supan Yodyingyong ◽  
Jeerapond Leelawattanachai ◽  
Wannapong Triampo ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Zinc Acetate ◽  
Near Infrared ◽  
Synergistic Effects ◽  
Zinc Nitrate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Oxide Powders ◽  
Zno Powders

The synthesis of ZnO comprising different ratios of zinc acetate (ZA) and zinc nitrate (ZN) from the respective zinc precursor solutions was successfully completed via a simple precipitation method. Zinc oxide powders with different mole ratios of ZA/ZN were produced—80/1, 40/1, and 20/1. The crystallinity, microstructure, and optical properties of all produced ZnO powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis-NIR spectrophotometry. The average agglomerated particle sizes of ZnO-80/1, ZnO-40/1, and ZnO-20/1 were measured at 655, 640, and 620 nm, respectively, using dynamic light scattering (DLS). The optical properties of ZnO were significantly affected by the extreme ratio differences in the zinc precursors. ZnO-80/1 was found to have a unique coral-sheet structure morphology, which resulted in its superior ability to reflect near-infrared (NIR) radiation compared to ZnO-40/1 and ZnO-20/1. The NIR-shielding performances of ZnO were assessed using a thermal insulation test, where coating with ZnO-80/1 could lower the inner temperature by 5.2 °C compared with the neat glass substrate. Due to the synergistic effects on morphology, ZnO-80/1 exhibited the property of enhanced NIR shielding in curtailing the internal building temperature, which allows for its utilization as an NIR-reflective pigment coating in the construction of building envelopes.

Fabrication and photoluminescence properties of hexagonal micro-pyramids ZnO powders by combustion synthesis

2011 ◽  
Vol 26 (4) ◽  
pp. 700-702 ◽  
Author(s):  
Ai Chen ◽  
Ying Zhang ◽  
Fancheng Meng ◽  
Hairong Wang ◽  
Zesong Li ◽  
...  
Keyword(s):  
Combustion Synthesis ◽  
Photoluminescence Properties ◽  
Zno Powders

Combustion synthesis and luminescent properties of a blue-green emitting phosphor: (Ba1.95, Eu0.05)ZnSi2O7:B3+

Open Physics ◽  
2009 ◽  
Vol 7 (4) ◽  
Author(s):  
Shan-shan Yao ◽  
Yuan-yuan Li ◽  
Li-hong Xue ◽  
Yan You ◽  
You-wei Yan
Keyword(s):  
Boric Acid ◽  
Combustion Synthesis ◽  
Broad Band ◽  
Green Emission ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Zinc Nitrate ◽  
Molar Ratio ◽  
Near Ultraviolet ◽  
Luminescence Spectrometry

AbstractA blue-green emitting phosphor (Ba1.95, Eu0.05)ZnSi2O7: Bx3+ was prepared by combustion synthesis and an efficient blue-green emission under near-ultraviolet was observed. The luminescence, crystallinity and particle sizes were investigated by using luminescence spectrometry, X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The emission spectrum shows a single band centered at 503 nm, which corresponds to the 4f 65d 1 →4f 7 transition of Eu2+. The excitation spectrum is a broad band extending from 260 to 465 nm, which matches the emission of ultraviolet light-emitting diodes. The optical absorption spectra of the (Ba1.95, Eu0.05)ZnSi2O7: B0.063+ exhibited band-gap energies of 3.9 eV. The results showed that boric acid was effective in improving the luminescence intensity of (Ba1.95, Eu0.05)ZnSi2O7, and the optimum molar ratio of boric acid to zinc nitrate was about 0.06. The phosphor (Ba1.95, Eu0.05)ZnSi2O7: B0.063+ synthesized by combustion method showed 1.5 times improved emission intensity compared with that of the Ba1.95ZnSi2O7: Eu0.052+ phosphor under λex = 353 nm.

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