Synthesis of ZnO Flower-Like Nanostructures on GaN Epitaxial Layer by Hydrothermal Process

2007 ◽  
Vol 124-126 ◽  
pp. 555-558 ◽  
Author(s):  
Jae Min Jang ◽  
Sung Hak Yi ◽  
Seung Kyu Choi ◽  
Jeong A Kim ◽  
Woo Gwang Jung
Keyword(s):  
Aqueous Solution ◽  
Hydrothermal Synthesis ◽  
Epitaxial Layer ◽  
Hydrothermal Process ◽  
Xrd Analysis ◽  
Zno Nanostructures ◽  
Single Crystalline ◽  
Zno Nanostructure

3D type flower-like ZnO nanostructure is fabricated on GaN epitaxial layer by hydrothermal synthesis. The formation of ZnO nanostructures is controlled dominantly by pH of the aqueous solution. The microstructure of flower-like ZnO nanostructure was examined by FE-SEM, XRD and FE-TEM. It is found that the shape of ZnO nanostructures are likely flower and chestnut bur shapes. FE-TEM and XRD analysis shows that ZnO nanostructures are single crystalline. Some discussion is made on the mechanism of ZnO growth in solutions with different pH.

MORPHOLOGICAL AND PHYSICAL PROPERTIES OF ZnO NANOSTRUCTURES GROWN ON Sb-DOPED ZnO SEEDING FILMS ANNEALED UNDER DIFFERENT ATMOSPHERES

2021 ◽  
pp. 2150116
Author(s):  
WUTTICHAI SINORNATE ◽  
HIDENORI MIMURA ◽  
WISANU PECHARAPA
Keyword(s):  
Physical Properties ◽  
Sol Gel ◽  
Hydrothermal Process ◽  
Visible Region ◽  
High Growth ◽  
High Growth Rate ◽  
Near Band Edge ◽  
Zno Nanostructures ◽  
Zno Nanostructure ◽  
Doped Zno

In this work, morphological and physical properties of pyramid-like ZnO nanostructures fabricated on Sb-doped ZnO seeding films annealed under different atmospheres are extensively studied. The Sb-doped ZnO seeding films were first prepared by sol–gel spin coating technique onto glass substrate then annealed in nitrogen, air and argon followed by low-temperature hydrothermal process for ZnO nanostructures fabrication. The morphological results exhibit the growth of pyramid-like ZnO nanostructure with increasing density of the ZnO nanostructures. The crystal structure shows pyramid-like ZnO wurtzite hexagonal growth along the c-axis without any impurity phase. The growth of pyramid-like ZnO nanostructures is due to the high growth rate of (002) plane. Photoluminescence spectra exhibit the near-band-edge of all samples while the red emission appears in ZnO nanostructures after the hydrothermal process due to the imperfection in the crystal. The reflectance of ZnO nanostructures covers the visible region with the absorption edge of 375[Formula: see text]nm. The calculation shows the relevant energy band gaps in the range of 3.26–3.28[Formula: see text]eV. The difference in hydrothermally grown ZnO nanostructures is significantly affected by different annealing atmospheres.

scholarly journals Hydrothermal Preparation of Silver Doping Zinc Oxide Nanoparticles: Studys, Characterization and Photocatalytic Activity

2018 ◽  
Vol 34 (4) ◽  
pp. 1898-1907 ◽  
Author(s):  
Hassan A. Habeeb Alshamsi ◽  
Batool S. Hussein
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Zno Nanoparticles ◽  
Hydrothermal Process ◽  
Hexagonal Structure ◽  
Infrared Spectrometry ◽  
Zno Nanostructures ◽  
Hydrothermal Preparation ◽  
Zno Nanostructure ◽  
Transmission Electron

In this study , we report the prepared of ZnO nanoparticles and Ag doped ZnO nanostructure via a hydrothermal process. The obtained nanostructures were characterized using different characterization techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) , atomic force microscopy (AFM) ,Fourier transform infrared spectrometry (FTIR)and UV/Visible spectrophotometer.The XRD results showed the wurtzite hexagonal structure of the ZnO Nanoparticles. Furthermore, the morphology of ZnO and Ag-ZnO nanostructures was obtained from SEM and AFM. The photocatalytic degradation of Cibacron Brilliant Yellow 3G-P (CB) dye was studied in presence of visible light using Ag-ZnO nanostructures as a photocatalyst. There are numerous factors which has an effect on the efficiency color removal of this process. Hence a study was conducted on the effect of several parameters on Ag-ZnO like amount of catalyst, CB dye concentration and pH of solution. Results showed Ag doping ZnO with 3% loading shows photocatalytic removal about 65% after 120 min which influenced superior photocatalytic activity than pure ZnO.

Hydrothermal synthesis of ZnO nanostructures with controllable morphology change

CrystEngComm ◽  
2020 ◽  
Vol 22 (8) ◽  
pp. 1346-1358 ◽  
Author(s):  
Vjaceslavs Gerbreders ◽  
Marina Krasovska ◽  
Eriks Sledevskis ◽  
Andrejs Gerbreders ◽  
Irena Mihailova ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Growth ◽  
Optimal Synthesis ◽  
Zno Nanostructures ◽  
Morphology Change ◽  
Zno Nanostructure ◽  
Synthesis Parameters

Optimal synthesis parameters for hydrothermal growth of nine ZnO nanostructure morphologies as a durable, homogeneous coating have been determined.

Effect of Heat Treatment on the Micro-Structural, Crystallinity and Photocatalytic Properties of Hydrothermally Prepared Titanate Nanowires

2016 ◽  
Vol 1133 ◽  
pp. 13-17
Author(s):  
Mohamad Siti Mariam ◽  
A.B. Siti Najihah ◽  
A.Z. Zuhana ◽  
M. Abd Kadir
Keyword(s):  
Aqueous Solution ◽  
Uv Light ◽  
Irradiation Time ◽  
Anatase Phase ◽  
Hydrothermal Process ◽  
Sodium Titanate ◽  
Xrd Analysis ◽  
Sample Heat ◽  
Heat Treated ◽  
Titanate Nanowires

Titanate nanowires were synthesised by hydrothermal process in 10M NaOH aqueous solution at 200oC for 24h. The samples were washed repeatedly in HCl aq. solution and deionized water until pH ~7. Subsequently, the samples were heat-treated at 400-850°C in air for 2h. The X-ray diffraction (XRD) analysis of the sample heat-treated at 800°C showed the crystalline structure of sodium titanate (Na2Ti6O13 ), while the presence of anatase phase was detected from the sample heat-treated at 850°C. Wire-like morphology of the synthesized sample was observed using FE-SEM. The photocatalytic activity of the samples heat-treated at 600,800, 850°C and 900°C was investigated by measuring the degradation of methylene blue (MB) in aqueous solution under UV-light irradiation and more than 90% of the dye was efficiently degraded by the sample heat-treated at 850°C within 45 minutes irradiation time as compared to other tested samples.

Synthesis Route of ZnO Nanostructures in Basic Solution

2016 ◽  
Vol 866 ◽  
pp. 156-160 ◽  
Author(s):  
Sayekti Wahyuningsih ◽  
Ari Handono Ramelan ◽  
Uswatul Chasanah ◽  
Rahmat Hidayat ◽  
Liya Saputri ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Xrd Analysis ◽  
Alcoholic Solution ◽  
Basic Solution ◽  
Zno Nanoparticle ◽  
Zno Nanostructures ◽  
Hexagonal Crystal ◽  
Visible Absorption ◽  
Zno Nanostructure ◽  
Zno Powder

ZnO nanostructures were synthesized by simple route method. The starting material of ZnO was prepared from ZnSO4.7H2O. The synthesis of ZnO nanoparticle was conducted by NaOH addition in alcoholic solution. That precursor was refluxed for 2 hours at 60°C until ZnO powder formed. Then the solids obtained were dried following by annealing process at 400, 500, and 600 °C. The XRD analysis confirms the Wurtzite hexagonal crystal structure of the product with crystallite size in 19–25 nm range. The morphology of the nanostructure product has been studied under scanning electron microscopy (SEM) dan transmitance electron microscopy (TEM). Generally, the ZnO nanostructure seem regularly spherical morphology, while the aglomeration were spherical ZnO-capped nanoplate ZnO. Optical properties was studied using ultraviolet visible absorption spectroscopy resulted the ZnO band gap about 3.5 eV.

Hydrothermal Synthesis and Characterizations of Cobalt-Doped ZnO Nanostructures

2011 ◽  
Vol 694 ◽  
pp. 274-277 ◽  
Author(s):  
Lu Ping Zhu ◽  
Nai Ci Bing ◽  
Dan Dan Yang ◽  
Hai Ying Jin
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Process ◽  
Zno Nanostructures ◽  
X Ray Diffraction ◽  
Energy Dispersion Spectroscopy ◽  
Visible Light Absorption ◽  
X Ray ◽  
Co Doping ◽  
Structure And Morphology ◽  
Doped Zno

Pure and Cobalt-doped ZnO nanostructures have been synthesized by a hydrothermal process. The samples were characterized by X-ray diffraction (XRD), UV-Vis diffusion reflectance spectra (DRS) and X-ray energy dispersion spectroscopy (EDS). The structure and morphology analyses show that Co doping can influence the nanostructures morphology, but cannot change the crystal structures of ZnO samples. The DRS spectra showed that Co dopant enhanced the ability of visible light absorption of the ZnO samples

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.

Characteristics of (1-y)[(Na0.5Bi0.5)1-xBax]O3-yBa(Cu1/2W1/2)O3 Ceramics Prepared by Hydrothermal Synthesis Route

2006 ◽  
Vol 45 ◽  
pp. 2472-2476
Author(s):  
Dong Xiang Zhou ◽  
Hui Li ◽  
Yi Hua Deng
Keyword(s):  
Dielectric Properties ◽  
Hydrothermal Synthesis ◽  
Dense Body ◽  
Hydrothermal Process ◽  
Xrd Analysis ◽  
Raw Material ◽  
Narrow Size Distribution ◽  
Sem Images ◽  
Pure Perovskite Structure ◽  
Average Gain

(Na0.5Bi0.5)TiO3 (Abbreviated to BNT) was synthesized by hydrothermal process and the average gain size was 15 nm with narrow size distribution. Pure perovskite structure of BNT particles was identified by XRD analysis. The nanoscale BNT powder was selected as raw material to fabricate BNT based ceramics with BaTiO3 (Abbreviated to BT) and Ba(Cu0.5W0.5)O3 (Abbreviated to BCW) doping. SEM images show that the ceramic using nanoscale BNT powder as raw material has a high dense body with the average gain size from 0.5 μm to 1 μm. The experimental results show that with increasing amount of BCW, d33 and Kp of (0.94-x)BNT-0.06BT-xBCW increase initially, then reach the maximum values of 130 pC/N and 0.32 when 5mol% of BCW was added. Further increasing amount of BCW leads to decreasing d33 and Kp. The optimal piezoelectric and dielectric properties were obtained as d33 = 130 pC/N, Kp = 0.32, εr = 800, tgδ = 0.06.

scholarly journals ᶫ-Leucine Loading and Release in MIL-100 Nanoparticles

2020 ◽  
Vol 21 (24) ◽  
pp. 9758
Author(s):  
Ivan E. Gorban ◽  
Mikhail A. Soldatov ◽  
Vera V. Butova ◽  
Pavel V. Medvedev ◽  
Olga A. Burachevskaya ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrothermal Synthesis ◽  
Cell Model ◽  
Metal Organic Framework ◽  
Acetic Acid Solution ◽  
Sorption Isotherms ◽  
Microwave Assisted Synthesis ◽  
High Porosity ◽  
Cytotoxicity Studies ◽  
Vis Spectroscopy

Synthesis of the MIL-100 metal-organic framework particles was carried out by hydrothermal (HT) and microwave (MW)-assisted methods. Transmission electron microscopy showed formation of microparticles in the course of hydrothermal synthesis and nanoparticles for microwave-assisted synthesis. Powder X-ray diffraction confirmed formation of larger crystallites for hydrothermal synthesis. Particle aggregation in aqueous solution was observed by dynamic light scattering. However, the stability of both samples could be improved in acetic acid solution. Nitrogen sorption isotherms showed high porosity of the particles. ᶫ-leucine molecule was used as a model molecule for loading in the porous micro- and nanoparticles. Loading was estimated by FTIR spectroscopy and thermogravimetric analysis. UV-VIS spectroscopy quantified ᶫ-leucine release from the particles in aqueous solution. Cytotoxicity studies using the HeLa cell model showed that the original particles were somewhat toxic, but ᶫ-leucine loading ameliorated the toxic effects, likely due to signaling properties of the amino acid.

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