scholarly journals Synthesis of 1D, 2D, and 3D ZnO Polycrystalline Nanostructures Using the Sol-Gel Method

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Yung-Kuan Tseng ◽  
Ming-Hung Chuang ◽  
Yen-Cheng Chen ◽  
Chao-Hsien Wu
Keyword(s):  
Phase Transition ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Formation Mechanisms ◽  
Zno Nanostructures ◽  
Photocatalytic Efficiency ◽  
Acetate Dihydrate ◽  
Synthetic Process ◽  
Good Crystallinity ◽  
2D And 3D

This study employed various polyol solvents to synthesize zinc oxide polycrystalline nanostructures in the form of fibers (1D), rhombic flakes (2D), and spheres (3D). The synthetic process primarily involved the use of zinc acetate dihydrate in polyol solutions, which were used to derive precursors of zinc alkoxides. Following hydrolysis at 160°C, the zinc alkoxide particles self-assembled into polycrystalline nanostructures with different morphologies. Following calcination at 500°C for 1 h, polycrystalline ZnO with good crystallinity was obtained. FE-SEM explored variations in surface morphology; XRD was used to analyze the crystalline structures and crystallinity of the products, which were confirmed as ZnO wurtzite structures. FE-TEM verified that the ZnO nanostructures were polycrystalline. Furthermore, we employed TGA/DSC to observe the phase transition. According to the results of property analyses, we proposed models of the relevant formation mechanisms. Finally, various ZnO structures were applied in the degradation of methylene blue to compare their photocatalytic efficiency.

SPECTROSCOPIC ELLIPSOMETRY STUDIES ON ZINC OXIDE THIN FILMS DEPOSITED BY SOL–GEL METHOD WITH VARIOUS PRECURSOR CONCENTRATIONS

2019 ◽  
Vol 26 (03) ◽  
pp. 1850158 ◽  
Author(s):  
MARYAM MOTALLEBI AGHGONBAD ◽  
HASSAN SEDGHI
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Optical Properties ◽  
Spectroscopic Ellipsometry ◽  
Zinc Acetate ◽  
Optical Band Gap ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Zno Thin Films ◽  
Acetate Dihydrate

Zinc Oxide thin films were deposited on glass substrates by sol–gel spin coating method. Zinc acetate dihydrate, 2-methoxyethanol and monoethanolamine were used as precursor, solvent and stabilizer, respectively. Zinc acetate dihydrate was used with different molar concentrations of 0.15, 0.25 and 0.5 M. Optical properties of ZnO thin films such as dielectric constants, absorption coefficient, Urbach energy and optical band gap energy were calculated by spectroscopic ellipsometry (SE) method. The effect of zinc acetate concentration on optical properties of ZnO thin films is investigated. ZnO thin film with Zn concentration of 0.25 M had the highest optical band gap. Wemple DiDomenico oscillator model was used for calculation of the energy of effective dispersion oscillator, the dispersion energy, the high frequency dielectric constant, the long wavelength refractive index and the free carrier concentration.

Effect of ZnO Seed Layer with Various Concentrations of Precursor on the Growth of ZnO Nanostructures

2016 ◽  
Vol 675-676 ◽  
pp. 237-240
Author(s):  
Nontakoch Siriphongsapak ◽  
Somyod Denchicharoen ◽  
Pichet Limsuwan
Keyword(s):  
Zinc Acetate ◽  
Seed Layer ◽  
Zinc Acetate Dihydrate ◽  
Zno Nanorods ◽  
Crystallographic Structure ◽  
Nitrate Hexahydrate ◽  
X Rays ◽  
Zno Nanostructures ◽  
Acetate Dihydrate ◽  
Seed Layers

In this work, Zinc oxide (ZnO) thin films were deposited on silicon and glass substrates using spin-coating method with different concentrations of precursor (zinc acetate dihydrate) and stabilizer (monoethanolamine). The concentrations of zinc acetate dihydrate and monoethanolamine in isopropanol were varied from 6 mM to 500 mM. Subsequently, the substrate with ZnO thin film as a seed layer was used to grow ZnO nanostructures by hydrothermal process with the same concentration of precursor (zinc nitrate hexahydrate), temperature, and time for each growth. The samples were characterized by field-emission scanning electron microscopy (FESEM), X-rays diffractometer (XRD), and UV-visible spectrophotometer (UV-vis) to study morphology, crystallographic structure, and optical property, respectively. The results showed that particle size, crystallinity, and transmittance of seed layers were changed with increasing concentrations of spin-coated precursor. Furthermore, the nanostructures were found that higher precursor concentration of seed layers affected the formation of ZnO nanorods to be nanosheets.

Effects of Thermal Annealing in Nitrogen on Photoluminescence of Sol-Gel Derived ZnO Nanocrystals

2013 ◽  
Vol 538 ◽  
pp. 26-29
Author(s):  
Qing Lan Ma ◽  
Bao Gai Zhai ◽  
Rui Xiong ◽  
Yuan Ming Huang
Keyword(s):  
Thermal Annealing ◽  
Annealing Temperature ◽  
Deep Level ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Alcoholic Solution ◽  
Acetate Dihydrate ◽  
Green Color ◽  
Zno Nanocrystals ◽  
Method Effects

The synthesis of ZnO nanocrystals is carried out in alkaline alcoholic solution of zinc acetate dihydrate by sol-gel method. Effects of thermal annealing in nitrogen on photoluminescence (PL) properties of the sol-gel derived ZnO nanocrystals were investigated by PL spectroscopy. With increasing annealing temperature in nitrogen, UV emissions of the ZnO nanocrystals red-shifted from 378 nm to 388 nm while deep-level luminescent bands ranging from 450 to 700 nm with three emission centers at about 502 nm, 538 nm and 602 nm are enhanced, and the green luminescent band gains its intensity at the expense of the yellow and orange luminescent bands. Our results have demonstrated that the origin yellow-green color PL was tuned towards the cyan color PL with increasing the thermal annealing temperature in nitrogen from 344 oC to 813 oC.

SYNTHESIS AND OPTICAL PROPERTIES OF THE MULTILAYER STARLIKE ZnO NANOSTRUCTURES

2011 ◽  
Vol 25 (08) ◽  
pp. 1143-1148 ◽  
Author(s):  
PYINGHUA WANG ◽  
XINGCHANG WANG ◽  
AIHUA WANG ◽  
BINGLIN ZHANG ◽  
YONGTIAO TIAN ◽  
...  
Keyword(s):  
Optical Properties ◽  
Zinc Acetate Dihydrate ◽  
Chemical Vapor ◽  
Hexagonal Wurtzite Structure ◽  
Zno Nanostructures ◽  
X Ray Diffraction ◽  
Acetate Dihydrate ◽  
Zno Nanostructure ◽  
Pl Spectrum ◽  
Source Materials

A novel multilayer starlike ZnO nanostructure has been successfully synthesized on a Si (111) substrate at 600°C by chemical vapor deposition using Zn and zinc acetate dihydrate as the source materials. The morphology, structure, and optical properties are investigated by field emission scanning electron microscopy, X-ray diffraction, Raman and photoluminescence (PL) spectrum, respectively. The results show that the multilayer starlike ZnO nanostructures have hexagonal wurtzite structure. The room-temperature PL spectrum shows the dominant green band peak and the weak UV peak. The possible growth mechanism of the multilayer starlike ZnO nanostructures is also discussed.

scholarly journals Synthesizing and Evaluating the Photocatalytic and Antibacterial Ability of TiO2/SiO2 Nanocomposite for Silicate Coating

2021 ◽  
Vol 9 ◽  
Author(s):  
Manh-Cuong Le ◽  
Thu-Huong Le ◽  
Thanh-Huyen Bui Thi ◽  
Quang-Dat Nguyen ◽  
Thanh-Ha Do Thi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Silicate Coating ◽  
Gel Method ◽  
Sol Gel Method ◽  
Antibacterial Ability

The TiO2/SiO2 nanocomposite has been synthesized by a sol-gel method and investigated the effect of the SiO2 content (0, 5, 10, 15, 20, and 50%) on the rutile-to-anatase phase transition of TiO2 NPs. In order to increase the photocatalytic efficiency of the nanocomposite and decrease the price of material, the TiO2/SiO2 Nc with content SiO2 of 15% sample is chosen for preparing silicate coating. The efficiency of photocatalytic MB and antibacterial ability in the air of W silicate coating (adding TiO2/SiO2 Nc (15%)) achieve almost 100% for 60 h and 94.35% for 3 h, respectively. While the efficiency of photocatalytic MB and antibacterial ability of WO silicate coating (adding commercial TiO2/SiO2) is about 25–30% for 60 h and 6.02% for 3 h, respectively. The presence of TiO2/SiO2 Nc (15%) with a larger surface area in W silicate coating can provide increased centers for absorption, photocatalytic reaction, and the contact between sample and bacteria lead to enhance the photocatalytic and antibacterial ability of W silicate coating.

scholarly journals Sintesis Mg2+ doped ZnO dengan penambahan albumen ayam ras menggunakan gabungan metode sol-gel dan sonokimia

2021 ◽  
Vol 12 (1) ◽  
pp. 27-35
Author(s):  
Sherly Kasuma Warda Ningsih ◽  
Umar Kalmar Nizar ◽  
Bahrizal Bahrizal ◽  
Edi Nasra ◽  
Siti Fatimah Mutiara R
Keyword(s):  
Crystal Structure ◽  
Surface Morphology ◽  
Crystal Size ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Ftir Analysis ◽  
Acetate Dihydrate ◽  
Chloride Hexahydrate ◽  
Doped Zno ◽  
Absorbance Band

Mg2+ doped ZnO has been successfully synthesized using a combination of sol-gel and sonochemical methods. Zinc acetate dihydrate was used as a precursor, magnesium chloride hexahydrate as a source of Mg dopant, methanol as a solvent, and chicken albumen was used as an additive to replace monoethanolamine. The sol was heated at 110 °C for 1 hour. The gel formed was calcined at 600 °C for 3 hours. FTIR analysis shows that the absorbance band around 400-450 cm-1 indicates Mg-O stretching, the absorbance band around 500-550 cm-1 indicates Zn-O stretching, the absorbance band around 400-550 cm-1 shows Zn-O-Mg bonds. Mg. Measurements with UV-DRS, obtained the smallest ZnO band gap value doped Mg2+ around 2.7 eV with the addition of 10 mL albumen. The resulting crystal structure was wurtzite with crystal size with the addition of 10, 20, 30, 40 and 50 mL albumen were 25.22-55.91 nm, 32.99-75.87 nm, 45.92-83.91 nm, 45.92-75.89 nm and 46.15-71.47 nm respectively. SEM photo of Mg2+ doped ZnO with the addition of 10 mL of albumen has a hexagonal surface morphology.

scholarly journals Air bubble promoted large scale synthesis of luminescent ZnO nanoparticles

2015 ◽  
Vol 3 (48) ◽  
pp. 12430-12435 ◽  
Author(s):  
S. Koch ◽  
S. Späth ◽  
A. Shmeliov ◽  
V. Nicolosi ◽  
K. Mandel
Keyword(s):  
Zinc Oxide Nanoparticles ◽  
Potassium Hydroxide ◽  
Large Scale ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Acetate Dihydrate ◽  
One Pot ◽  
Synthesis Of Nanoparticles ◽  
Air Bubble ◽  
Sol Gel Synthesis

Luminescent zinc oxide nanoparticles were synthesized via a facile one-pot sol–gel synthesis route using zinc acetate dihydrate and potassium hydroxide as cheap precursors. It is demonstrated that dissolved oxygen plays a key role in the synthesis of nanoparticles.

SCANNING ELECTRON MICROSCOPE AND X-RAY DIFFRACTION STUDIES ON THE LATTICE CONSTANT OF SPIN-COATED Zn1-xMgxO THIN FILMS OF SOL-GEL METHOD

2005 ◽  
Vol 12 (04) ◽  
pp. 605-610 ◽  
Author(s):  
M. RUSOP ◽  
K. UMA ◽  
T. SOGA ◽  
T. JIMBO
Keyword(s):  
Thin Films ◽  
Lattice Constant ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Zno Films ◽  
Silicon Substrates ◽  
Acetate Dihydrate ◽  
Glass Substrates ◽  
Sol Gel Process ◽  
Coating Method

ZnO and Zn 1-x Mg x O thin films were prepared on glass and silicon substrates by spin coating method using 2-methoxyethanol solution of zinc acetate dihydrate and magnesium acetate dihydrate stabilized by monoethanolamine. The effects of drying and annealing condition of structural and optical properties of the films were studied. It was found that the samples annealed at 650°C improves the crystallographic orientation of the ZnO films grown by the sol-gel process significantly. Two types of substrates were used to examine the substrate effects of the growth of Zn 1-x Mg x O thin films. In corning glass substrates, the lattice constant decreased by a little with increasing concentration of Mg , whereas in the case of silicon substrates, the lattice constant decreased rapidly with x when compared to the glass substrates. The optical band energy gaps of Zn 1-x Mg x O thin films were slightly increased with increasing concentration of Mg .

scholarly journals Novel Low Temperature Route to Produce CdS/ZnO Composite Nanofibers as Effective Photocatalysts

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 417
Author(s):  
Abdullah M. Al-Enizi ◽  
M. M. El-Halwany ◽  
Mohammed A. Al-Abdrabalnabi ◽  
Mahmoud Bakrey ◽  
Mohd Ubaidullah ◽  
...  
Keyword(s):  
Composite Nanofibers ◽  
Hexagonal Phase ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Order Relation ◽  
Cadmium Acetate ◽  
Cds Nanoparticles ◽  
Acetate Dihydrate ◽  
Ammonium Sulfide ◽  
Poly Caprolactone

In this work, CdS/ZnO composite nanofibers (NFs) were prepared by the electrospinning of a sol–gel comprised of poly(caprolactone), zinc acetate dihydrate, cadmium acetate dihydrate, and ammonium sulfide. The electrospun NF mats were calcined under vacuum in an argon (Ar) atmosphere at 200 °C for 1 h. Standard physiochemical analysis techniques demonstrated the formation of the crystalline hexagonal phase of CdS and ZnO. Composite NFs showed good photocatalytic degradation of methylene blue (MB) dye under visible light irradiation compared to their counterparts. CdS nanoparticles, ZnO nanofibers, and composite NFs photodegraded 35.5%, 47.3%, and 90% of the MB dye, respectively, within 100 min. The reaction kinetics of MB photodegradation using the composite NFs followed the pseudo-first-order relation. Owing to their facile preparation and good photodegradation ability, the proposed method can be used to prepare various photocatalysts for wastewater treatment.

Antimicrobial Properties of the Modified Cotton Textiles by the Sol-Gel Technology

2015 ◽  
Vol 1117 ◽  
pp. 213-216 ◽  
Author(s):  
Svetlana Vihodceva ◽  
Silvija Kukle ◽  
Olga Muter
Keyword(s):  
Microbial Growth ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Trichoderma Viride ◽  
Antimicrobial Properties ◽  
Cotton Textile ◽  
Strong Inhibition ◽  
Acetate Dihydrate ◽  
X Ray ◽  
Amorphous Coatings

Comparison of the antimicrobial properties of textiles with amorphous coatings containing Zn and Si obtained by the sol-gel technology against microorganismsPseudomonas fluorescens,Saccharomyces cerevisae,Trichoderma viridethat can cause cotton textile destruction was made. Modified textile were evaluated using scanning electron microscopy, energy dispersive x-ray spectroscopy. Investigation of antimicrobial properties of the cotton fabric samples treated with different zinc acetate dihydrate concentration sols and various thermal post-treatments was made. Strong inhibition of microbial growth was detected for all cotton textile samples treated via sol-gel method according all tests microorganisms.

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