Synthesis of Lotus-Leaf-Shaped and Four-Footed ZnO Nanostructure on a Large Scale

2009 ◽  
Vol 48 (9) ◽  
pp. 091101 ◽  
Author(s):  
Yuefu Zhang ◽  
Yuguo Li ◽  
Jingyao Zhang ◽  
Chuanwen Cui
Keyword(s):  
Large Scale ◽  
Lotus Leaf ◽  
Zno Nanostructure

Large-scale, single-oriented ZnO nanostructure on h-BN films for flexible inorganic UV sensors

2021 ◽  
Vol 130 (22) ◽  
pp. 223105
Author(s):  
Hongseok Oh ◽  
Youngbin Tchoe ◽  
Heehun Kim ◽  
Jiyoung Yun ◽  
Mingi Park ◽  
...  
Keyword(s):  
Large Scale ◽  
Zno Nanostructure ◽  
Uv Sensors

STRUCTURAL AND OPTICAL PROPERTIES OF LARGE-SCALE ZnO NANOWIRES AND NANOSHEETS PREPARED BY DRY THERMAL OXIDATION

2009 ◽  
Vol 16 (06) ◽  
pp. 901-904 ◽  
Author(s):  
S. S. TNEH ◽  
H. ABU HASSAN ◽  
K. G. SAW ◽  
F. K. YAM ◽  
Z. HASSAN
Keyword(s):  
Optical Properties ◽  
Thermal Oxidation ◽  
Large Scale ◽  
Gas Flow ◽  
Deep Level ◽  
Exciton Peak ◽  
Interstitial Oxygen ◽  
Energy Dispersion Spectroscopy ◽  
Zno Nanostructure ◽  
Annealing Conditions

In this work, we report the morphology and optical properties of zinc oxide ( ZnO ) layers prepared by dry thermal oxidation at different annealing conditions. Morphology studies using scanning electron microscope (SEM) show that the amount of nanowires and nanosheets increases with the introduction of a flow of O2 gas. High-resolution X-ray diffraction (HR-XRD) data show that typical polycrystalline ZnO nanostructure layers have been deposited. Near-perfect stoichiometry of Zn and O atom vacancies has been observed from energy dispersion spectroscopy (EDS) spectrum. Photoluminescence (PL) spectra show strong peaks at UV and green regions. An increase in the stoichiometry of ZnO has been achieved with the oxygen gas flow during annealing indicating that deep-level defects represented by interstitial oxygen and antisite oxygen are gas pressure dependent. A single exciton peak with binding energy 60 meV has been observed at room temperature.

Electrochemical Synthesis for Uniform and Large-Scale Zinc Oxide Nano Structure Films

2011 ◽  
Vol 194-196 ◽  
pp. 429-435
Author(s):  
Wen Zhang ◽  
Yong Ning He ◽  
Wu Yuan Cui ◽  
Cheng Bo Zhou
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Indium Tin Oxide ◽  
Large Scale ◽  
Deposition Time ◽  
Zno Films ◽  
Nano Structure ◽  
Zno Nanostructure ◽  
Ito Glass ◽  
Flake Structure

Three different kinds of zinc oxide (ZnO) nanostructure films have been synthesized on an indium tin oxide (ITO) glass substrate by electrochemical method with adjusting the concentration of the electrolyte, deposition time and temperature. X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and photoluminescence (PL) spectrum have been used to determine the characteristics of these nanostructures. The results show that concentration of the electrolyte is one of the most important factors that determine the morphologies of ZnO films. Nanobuds, nanorods, flakes are obtained with the electrolyte concentration increasing. Nanobuds and nanorods have no significant changes with the deposition time prolonged while the flakes grow bigger and thicker. The flakes merge together at high temperature while nanobuds remain unchanged except getting larger and sparser. Nanobuds and nanorods show single crystal patterns while the flakes are composted by multi crystals. The reasons forming such different morphology were discussed according to crystal growth theory. The PL spectra of these ZnO films are quite different according to various microstructures. The film with flake structure has a significant widen near edge emission peak with the depressed visible emission, which may have potential applications on optoelectronic devices and sensors.

Surface enhanced lithography with adhesion agent to achieve large-scale ZnO nanostructure on stainless steel substrate

2018 ◽  
Vol 11 (04) ◽  
pp. 1850084 ◽  
Author(s):  
Qiang Ma ◽  
Min Zhu ◽  
Yuzhen Zhao ◽  
Siyi Ding ◽  
Shaopeng Tian ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Photoelectron Spectroscopy ◽  
Large Scale ◽  
Steel Substrate ◽  
Vital Role ◽  
Secondary Phases ◽  
Zno Film ◽  
Zno Nanostructure ◽  
Potassium Acid Phthalate ◽  
Acid Phthalate

We present a novel point of view to fabricate an enhanced stability controllable growing, large-scale, direct, fast and template assisted nanostructure ZnO with twin –OH group terminated of compound containing –OH group by electrochemical deposition (ECD). In this paper, the collected potassium acid phthalate with twin –OH group was printed to form a matrix as template to synthesize a ZnO nanostructure. Structural analyses showed that the ZnO nanostructure is wurtzite in structure, without any secondary phases. Various features of Raman mapping and X-ray photoelectron spectroscopy of the as-prepared ZnO were found to mark variety of the characteristic of the as-prepared ZnO before and after tape test. A direct link between growing ZnO and potassium acid phthalate with twin –OH group was established, suggesting that this special twin –OH group between nanostructure ZnO and substrate (stainless steel) plays a vital role in forming a firm nanostructure ZnO film on the surface of the substrate. Furthermore, we raised a mechanism to explicate the functional process of twin –OH group on ZnO film. We believe that this facile method to fabricate a controllable nanostructure ZnO here is equally applicable to other semiconductors which are critical in optoelectronics, lasing and luminescence applications.

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

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