Preparation of ZnO Nanostructures and their Self-Assembly

2012 ◽  
Vol 535-537 ◽  
pp. 380-383
Author(s):  
Huan Di Huang ◽  
Wen Tao Yang ◽  
Li Na Wang
Keyword(s):  
Zinc Oxide ◽  
Hydrothermal Synthesis ◽  
Reaction Temperature ◽  
Self Assembly ◽  
Synthesis Method ◽  
Zno Nanorod ◽  
Zno Nanostructures ◽  
Oxide Morphology ◽  
Reaction Conditions

Well-defined ZnO nanostructures and their self-assembly have been fabricated directly on Zn foil via a hydrothermal synthesis method. (NH4)2S2O8 was introduced as the controllable reagent for the growth of ZnO. Nanorod-, nanowire- and nanobranch-like ZnO can be easily prepared. The experiment results indicated that the zinc oxide morphology and thier self-assemblied structures can be controlled by changing the reaction conditions. The effects of the concentration of NaOH, reaction temperature on the morphology of these nanostructures were investigated, and the possible mechanism of the ZnO nanostructures was proposed.

Engineering the shape of Zinc Oxide crystals via sonochemical or hydrothermal solution-based methods

2008 ◽  
Vol 1087 ◽  
Author(s):  
Marco Palumbo ◽  
Simon J. Henley ◽  
Thierry Lutz ◽  
Vlad Stolojan ◽  
David Cox ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Self Assembly ◽  
Hydrothermal Solution ◽  
Good Control ◽  
Transparent Conductors ◽  
Zno Nanostructures ◽  
Large Area ◽  
Light Emitting Devices ◽  
Wide Range ◽  
Solution Methods

AbstractRecent results in the use of Zinc Oxide (ZnO) nano/submicron crystals in fields as diverse as sensors, UV lasers, solar cells, piezoelectric nanogenerators and light emitting devices have reinvigorated the interest of the scientific community in this material. To fully exploit the wide range of properties offered by ZnO, a good understanding of the crystal growth mechanism and related defects chemistry is necessary. However, a full picture of the interrelation between defects, processing and properties has not yet been completed, especially for the ZnO nanostructures that are now being synthesized. Furthermore, achieving good control in the shape of the crystal is also a very desirable feature based on the strong correlation there is between shape and properties in nanoscale materials. In this paper, the synthesis of ZnO nanostructures via two alternative aqueous solution methods - sonochemical and hydrothermal - will be presented, together with the influence that the addition of citric anions or variations in the concentration of the initial reactants have on the ZnO crystals shape. Foreseen applications might be in the field of sensors, transparent conductors and large area electronics possibly via ink-jet printing techniques or self-assembly methods.

scholarly journals Antibacterial Application on Staphylococcus aureus Using Antibiotic Agent/Zinc Oxide Nanorod Arrays/Polyethylethylketone Composite Samples

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 713
Author(s):  
Dave W. Chen ◽  
Kuan-Yi Lee ◽  
Min-Hua Tsai ◽  
Tung-Yi Lin ◽  
Chien-Hao Chen ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Zinc Oxide ◽  
Synthesis Method ◽  
Antibacterial Properties ◽  
Precursor Solution ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Antibiotic Agent ◽  
Buffer Solution

In this study, zinc oxide (ZnO) nanorod arrays as antibiotic agent carriers were grown on polyetheretherketone (PEEK) substrates using a chemical synthesis method. With the concentration of ammonium hydroxide in the precursor solution kept at 4 M, ZnO nanorod arrays with diameters in the range of 100–400 nm and a loading density of 1.7 mg/cm2 were grown onto the PEEK substrates. Their drug release profiles and the antibacterial properties of the antibiotic agent/ZnO/PEEK samples in the buffer solution were investigated. The results showed that the concentrations of antibiotic agents (ampicillin or vancomycin) released from the samples into the buffer solution were higher than the value of minimum inhibitory concentration of 90% for Staphylococcus aureus within the 96 h test. The bioactivities of ampicillin and vancomycin on substrates also showed around 40% and 80% on the Staphylococcus aureus, respectively. In the antibacterial activity test, sample with the suitable loading amount of antibiotic agent had a good inhibitory effect on the growth of Staphylococcus aureus.

Synthesis and characterization of [Cu(salen)]2 coordination nano-assembly by a green and simple method

2017 ◽  
Vol 232 (6) ◽  
Author(s):  
Maryam Mohammadikish ◽  
Fatemeh Bagheri
Keyword(s):  
Hydrothermal Synthesis ◽  
Reaction Temperature ◽  
Self Assembly ◽  
Synthesis And Characterization ◽  
Simple Method ◽  
Synthesis Route ◽  
Experimental Parameters ◽  
Temperature Time

AbstractHierarchical structured microplates consisting of nanoparticles were grown based on a self-assembly approach via a hydrothermal synthesis route without using any additive. Experimental parameters, such as reaction temperature, time and solvent play crucial roles in determining the morphology of final product. The nanoscale shape and macroscopically assembled architecture of [Cu(salen)]

scholarly journals Homoepitaxial Nanostructures of Zinc Oxide

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Tatiana V. Plakhova ◽  
Andrey N. Baranov ◽  
Alexander V. Knotko ◽  
Gennady N. Panin
Keyword(s):  
Zinc Oxide ◽  
Fast Growth ◽  
Luminescence Properties ◽  
Zno Nanorod ◽  
Zno Nanostructures ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Homoepitaxial Growth ◽  
Growth From Solution ◽  
Growth From Vapor

The homoepitaxial ZnO nanostructures (HENS) were obtained on different substrates using various techniques. The first type of homoepitaxial ZnO nanorod arrays was grown on Si or ITO substrates by using two alternative sequences: (a) seeding→growth from solution→growth from vapor and contrariwise (b) seeding→growth from vapor→growth from solution. As follows from transport and cathode luminescence measurements homoepitaxial growth allows enhancing electrical or luminescence properties. The second type of HENS was prepared by growth of vertically or horizontally oriented ZnO nanorod arrays depending on monocrystalline ZnO wafers with[0001]and[10-10]orientation. In all cases the growth occurs along thec-axis of fast growth.

HYDROTHERMAL SYNTHESIS OF ZnO NANOSTRUCTURES UNDER HIGH PULSED MAGNETIC FIELD

2009 ◽  
Vol 23 (17) ◽  
pp. 3655-3659 ◽  
Author(s):  
ZHUN WANG ◽  
MINGYUAN ZHU ◽  
YING LI ◽  
HONGMING JIN ◽  
ZHENZHEN ZHU ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Zinc Oxide ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Nucleation And Growth ◽  
Pulsed Magnetic Field ◽  
Zno Nanostructures ◽  
Zno Particles ◽  
The Magnetic Field

Crystalline zinc oxide (ZnO) particles with different morphologies have been synthesized by the hydrothermal method under the magnetic field. It is found that the magnetic field influences the nucleation and growth of ZnO crystals. ZnO crystals obtained under high pulsed magnetic field were more uniform and well integrated.

scholarly journals Copper–zinc oxide heterojunction catalysts exhibiting enhanced photocatalytic activity prepared by a hybrid deposition method

RSC Advances ◽  
2021 ◽  
Vol 11 (17) ◽  
pp. 10224-10234
Author(s):  
José Montero ◽  
Tesfalem Welearegay ◽  
Jakob Thyr ◽  
Henry Stopfel ◽  
Tatjana Dedova ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
Deposition Method ◽  
Cu Nanoparticles ◽  
Copper Zinc ◽  
Copper Zinc Oxide ◽  
Interfacial Charge

Hybrid synthesis of Cu2O/ZnO nanorod heterojunction exhibiting enhanced interfacial charge transfer and photocatalytic activity comprising hydrothermal synthesis step of ZnO nanorods followed by advanced gas deposition of Cu nanoparticles.

Hydrothermal synthesis of a 3D double-sided comb-like ZnO nanostructure and its growth mechanism analysis

2016 ◽  
Vol 52 (53) ◽  
pp. 8231-8234 ◽  
Author(s):  
Wenqiang Li ◽  
Shiyong Gao ◽  
Lin Li ◽  
Shujie Jiao ◽  
Hongtao Li ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Growth Mechanism ◽  
Self Assembly ◽  
Three Dimensional ◽  
Mechanism Analysis ◽  
Two Dimensional ◽  
Zno Nanostructures ◽  
One Dimensional ◽  
Zno Nanostructure ◽  
2D Nanosheets

Self-assembly of two-dimensional (2D) nanosheets and one-dimensional (1D) nanorods into three-dimensional (3D) double-sided comb-like ZnO nanostructures has been successfully performed on Si and ITO substrates.

Batch Supercritical Hydrothermal Synthesis of CeO2 Nanoparticles

2011 ◽  
Vol 284-286 ◽  
pp. 773-780
Author(s):  
Dan Zhao ◽  
Da Liang Li ◽  
Xin Qiang Wu ◽  
En Hou Han
Keyword(s):  
Reaction Time ◽  
Hydrothermal Synthesis ◽  
Reaction Temperature ◽  
Ph Value ◽  
Synthesis Method ◽  
Additional Treatment ◽  
Reactant Concentration ◽  
Size And Morphology ◽  
Supercritical Hydrothermal Synthesis

CeO2 nanoparticles with diameter of about 5 nm were prepared by batch supercritical hydrothermal synthesis method at 390 °C without additional treatment. It was found that the characteristics of products depended on the pH value, reactant concentration (C0), and reaction temperature. The reaction time and coexisting cations (Li+, Na+ and K+) had little effect on the size and morphology of CeO2 particles. Uniform CeO2 nanoparticles were synthesized at 390 °C, pH = 9 and C0 = 0.06 M. The mechanism for batch supercritical hydrothermal synthesis of CeO2 nanoparticles is discussed.

scholarly journals Self-Assembled Bimetallic Aluminum-Salen Catalyst for the Cyclic Carbonates Synthesis

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4097
Author(s):  
Wooyong Seong ◽  
Hyungwoo Hahm ◽  
Seyong Kim ◽  
Jongwoo Park ◽  
Khalil A. Abboud ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Self Assembly ◽  
Reaction Pathway ◽  
Kinetic Studies ◽  
Cyclic Carbonate ◽  
Reaction Conditions ◽  
Formation Reaction ◽  
X Ray ◽  
Carbonate Formation ◽  
Salen Aluminum

Bimetallic bis-urea functionalized salen-aluminum catalysts have been developed for cyclic carbonate synthesis from epoxides and CO2. The urea moiety provides a bimetallic scaffold through hydrogen bonding, which expedites the cyclic carbonate formation reaction under mild reaction conditions. The turnover frequency (TOF) of the bis-urea salen Al catalyst is three times higher than that of a μ-oxo-bridged catalyst, and 13 times higher than that of a monomeric salen aluminum catalyst. The bimetallic reaction pathway is suggested based on urea additive studies and kinetic studies. Additionally, the X-ray crystal structure of a bis-urea salen Ni complex supports the self-assembly of the bis-urea salen metal complex through hydrogen bonding.

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