Low-Temperature Cathodoluminescence Investigations of High-Quality Zinc Oxide Nanorods

2015 ◽  
Vol 21 (3) ◽  
pp. 564-569 ◽  
Author(s):  
Bartlomiej S. Witkowski ◽  
Lukasz Wachnicki ◽  
Sylwia Gieraltowska ◽  
Anna Reszka ◽  
Bogdan J. Kowalski ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Radiation Effects ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Nanorod Arrays ◽  
High Quality ◽  
Sem Images ◽  
Oxide Nanorods ◽  
Very High

AbstractWe present results of cathodoluminescence (CL) investigations of high-quality zinc oxide (ZnO) nanorods obtained by an extremely fast hydrothermal method on a silicon substrate. A scanning electron microscopy (SEM) system equipped with CL allows direct comparison of SEM images and CL maps, taken from exactly the same areas of samples. Investigations are performed at a temperature of 5 K. An interlink between sample microstructure and emission properties is investigated. CL confirms a very high quality of ZnO nanorods produced by our method. In addition, the presence of super radiation effects in ZnO nanorod arrays is suggested.

Two-Photon Excited Ultraviolet Photoluminescence of Zinc Oxide Nanorods

2008 ◽  
Vol 8 (11) ◽  
pp. 5854-5857 ◽  
Author(s):  
Guangping Zhu ◽  
Chunxiang Xu ◽  
Jing Zhu ◽  
Changgui Lu ◽  
Yiping Cui ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Emission Band ◽  
Single Photon ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Excitation Wavelength ◽  
Photoluminescence Intensity ◽  
Vapor Phase Transport ◽  
Two Photon ◽  
Oxide Nanorods

High density zinc oxide nanorods with uniform size were synthesized on (100) silicon substrate by vapor-phase transport method. The scanning electron microscopy images reveal that the nanorods have an average diameter of about 400 nm. The X-ray diffraction pattern demonstrates the wurtzite crystalline structure of the ZnO nanorods growing along [0001] direction. The single-photon excited photoluminescence presents a strong ultraviolet emission band at 394 nm and a weak visible emission band at 600 nm. When the ZnO nanorods were respectively pumped by various wavelength lasers from 520 nm to 700 nm, two-photon excited ultraviolet photoluminescence was observed. The dependence of the two-photon excited photoluminescence intensity on the excitation wavelength and power was investigated in detail.

scholarly journals Active Role of ZnO Nanorods in Thermomechanical and Barrier Performance of Poly(vinyl alcohol-co-ethylene) Formulations for Flexible Packaging

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 922 ◽  
Author(s):  
Francesca Luzi ◽  
Alessandro Di Michele ◽  
Luigi Torre ◽  
Debora Puglia
Keyword(s):  
Zinc Oxide ◽  
Vinyl Alcohol ◽  
Zno Nanorods ◽  
Accelerated Aging ◽  
Active Role ◽  
Zinc Oxide Nanorods ◽  
Poly Vinyl Alcohol ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Oxide Nanorods

Poly(vinyl alcohol-co-ethylene) (EVOH) films containing zinc oxide nanorods (ZnO Nrods) at 0.1, 0.5, and 1 wt%, were realized by solvent casting. The effect of ZnO Nrods content on morphological, thermal, optical, mechanical, and oxygen permeability properties were analyzed. In addition, moisture content and accelerated-aging test studies were performed, with the intention to determine the influence of zinc oxide nanofillers on the functional characteristics of realized packaging systems. Tensile properties showed increased values for strength and deformation-at-break in EVOH-based formulations reinforced with 0.1 and 0.5 wt% of zinc oxide nanorods. Results from the colorimetric and transparency investigations underlined that the presence of ZnO Nrods in EVOH copolymer did not induce evident alterations. In addition, after the accelerated-aging test, the colorimetric test confirmed the possibility for these materials to be used in the packaging sector. This behavior was induced by the presence of zinc oxide nanofillers that act as a UV block that made them useful as an efficient absorber of UV radiation.

Zinc Oxide Nanorods Characteristics Prepared by Sol-Gel Immersion Method Immersed at Different Times

2013 ◽  
Vol 667 ◽  
pp. 375-379 ◽  
Author(s):  
M. Awalludin ◽  
Mohamad Hafiz Mamat ◽  
Mohd Zainizan Sahdan ◽  
Z. Mohamad ◽  
Mohamad Rusop
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Immersion Time ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Immersion Method ◽  
X Ray ◽  
Oxide Nanorods ◽  
Scanning Electron

This paper focus on zinc oxide (ZnO) nanorods prepared using sol-gel immersion method immersed at different time. Immersion times have been varied 1~24 hr and the characteristics of each sample have been observed. The effects of immersion time on ZnO nanorods thin films have been studied in surface morphology and structural properties using Scanning Electron Microscopy (SEM) and X-ray diffractometer (XRD), respectively.

Optical Properties of Al Doped Zinc Oxide Nanorods Thin Film Deposited by Immersion Technique

2013 ◽  
Vol 667 ◽  
pp. 388-392
Author(s):  
S.Z. Muhamed ◽  
Mohamad Hafiz Mamat ◽  
Mohamad Rusop
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Electrical Properties ◽  
Surface Morphology ◽  
Immersion Time ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Oxide Nanorods ◽  
Immersion Technique ◽  
Doped Zno

We investigated the effect of immersion time on optical, electrical properties and surface morphology of nanostructured Aluminium (Al) doped Zinc Oxide (ZnO) thin films prepared by immersion technique. UV-Vis-NIR spectra indicate that the transmittance of the samples decrease with immersion time. Electrical properties study reveals the nanostructured Al doped ZnO thin film at 1 hr shows the lowest resistivity compared to other samples. Surface morphology results as characterized by scanning electron microscope (SEM) show that the Al doped ZnO nanorods quantity increased with immersion time.

scholarly journals Investigation of Angiogenesis and Wound Healing Potential Mechanisms of Zinc Oxide Nanorods

2021 ◽  
Vol 12 ◽  
Author(s):  
Amr Hassan ◽  
Ahmed I. Abd El Maksoud ◽  
Dalia Elebeedy ◽  
Mohammad A. Zoair ◽  
Emadeldin R. Matar
Keyword(s):  
Wound Healing ◽  
Zinc Oxide ◽  
Zno Nanorods ◽  
Chorioallantoic Membrane ◽  
Zinc Oxide Nanorods ◽  
Vegf Expression ◽  
Angiogenic Potential ◽  
Oxide Nanorods ◽  
Angiogenesis Process ◽  
Chorioallantoic Membrane Assay

The angiogenesis process is an essential issue in tissue engineering. Zinc oxide nanorods are biocompatible metals capable of generating reactive oxygen species (ROS) that respond to induced angiogenesis through various mechanisms; however, released Zn (II) ions suppress the angiogenesis process. In this study, we fabricated green ZnO nanorods using albumin eggshell as a bio-template and investigate its angiogenic potential through chorioallantoic membrane assay and excision wound healing assay. This study demonstrated that angiogenesis and wound healing processes depend on pro-angiogenic factors as VEGF expression due to ZnO nanorods' exiting. Angiogenesis induced via zinc oxide nanorods may develop sophisticated materials to apply in the wound healing field.

Growth of Arrayed ZnO Nanorods from Aqueous Solution at 60°C

2010 ◽  
Vol 123-125 ◽  
pp. 691-694
Author(s):  
Gang Qiang Yang ◽  
Xiao Ping Zou ◽  
Xiang Min Meng ◽  
Gong Qing Teng ◽  
Jin Cheng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zinc Oxide ◽  
Low Temperature ◽  
Zno Nanorods ◽  
The Other ◽  
Zinc Oxide Nanorods ◽  
Zno Films ◽  
Growth Mechanisms ◽  
Oxide Nanorods ◽  
Zno Particles

In this paper, zinc oxide nanorods were prepared on many different substrates in the aqueous solution without adding alkali solution at 60°C. A layer of ZnO particles as the seeds for the growth were not needed to be coated on the substrates beforehand. A higher uniform and denser packed array of hexagonal ZnO nanorods forms on the glass substrate than that on the other substrates in our experiments. This technique is applicable for the preparation and patterning of functional ZnO films at low temperature. The growth mechanisms of the as-synthesized ZnO nanorods were also proposed.

TYROSINASE BIOSENSOR BASED ON ZINC OXIDE NANORODS

NANO ◽  
2007 ◽  
Vol 02 (05) ◽  
pp. 281-284 ◽  
Author(s):  
L. Y. CHEN ◽  
B. X. GU ◽  
G. P. ZHU ◽  
Y. F. WU ◽  
S. Q. LIU ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zno Nanorods ◽  
Electrochemical Measurement ◽  
Sem Analysis ◽  
Zinc Oxide Nanorods ◽  
Electron Microscopic ◽  
Vapor Phase Transport ◽  
Oxide Nanorods ◽  
Vapor Phase Transport Method ◽  
Chemical Purity

A phenol biosensor based on the skillful immobilization of tyrosinase on zinc oxide ( ZnO ) nanorods was proposed. The ZnO nanorods fabricated by a simple vapor-phase transport method possess a high aspect ratio, good electron communication, chemical purity, smooth and positive charged surface and are ready for immobilization of biochemicals with low isoelectric point (IEP). Electrochemical measurement and Scanning Electron Microscopic (SEM) analysis showed that the enzyme of tyrosinase with IEP 4.5 can be adsorbed on the surface of ZnO nanorods and kept its bioactivity of the oxidation of phenol to a large extent. This led us to develop phenol biosensor with good stability and reproducibility. The proposed method creates a new way to develop biosensors using nanostructured materials with high IEP.

pH study of zinc oxide nanorods grown on indium tin oxide coated substrate,

2014 ◽  
Vol 92 (7/8) ◽  
pp. 838-841 ◽  
Author(s):  
Kevin Farmer ◽  
Parameswar Hari ◽  
Kenneth Roberts
Keyword(s):  
Zinc Oxide ◽  
Chemical Bath Deposition ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electronic Device ◽  
Ph Dependence ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Visible Range ◽  
Oxide Nanorods

Controlled growth of ZnO nanorods on various substrates is of great interest in photonic and electronic device applications. Also of interest is increasing the optical activity of zinc oxide nanorods in the visible spectrum. In this study, we report pH dependence for the morphology and photoluminescence of aligned ZnO nanorods grown on an indium tin oxide (ITO) coated glass substrate deposited by a wet chemical bath deposition method. The ZnO nanorods were grown by a chemical bath deposition technique using equimolar ratios of zinc (II) nitrate and hexamethylenetetramine in solution at 95 °C. The pH of the reaction solution prior to oven heating was varied from pH 5 to 10.6. Surface properties of the ZnO nanorods on ITO substrates were studied using scanning electron microscopy and photoluminescence spectroscopy. We also compared the use of NaOH to adjust the pH with the use of NH4OH, the latter necessary at higher pH due to the relative insolubility of zinc. It was found that the size of the nanorods can vary twofold with pH and the choice of base. Uniformity of coverage is also significantly dependent upon these variables and will be discussed as it relates to solubility and crystal growth. It was also found that the intensity of the photoluminescence in the visible range is pH dependent. For example, the intensity of luminescence at 550 nm for ZnO nanorods grown at pH 7 using NH4OH is 532% of the corresponding emission for a sample prepared at pH 5.

scholarly journals Additive Production of a Material Based on an Acrylic Polymer with a Nanoscale Layer of Zno Nanorods Deposited Using a Direct Current Magnetron Discharge: Morphology, Photoconversion Properties, and Biosafety

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6586
Author(s):  
Dmitry E. Burmistrov ◽  
Denis V. Yanykin ◽  
Mark O. Paskhin ◽  
Egor V. Nagaev ◽  
Alexey D. Efimov ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Direct Current ◽  
Higher Plants ◽  
Zno Nanorods ◽  
Oxide Coating ◽  
Zinc Oxide Nanorods ◽  
Control Group ◽  
Magnetron Discharge ◽  
Acrylic Polymer ◽  
Oxide Nanorods

On the basis of a direct current magnetron, a technology has been developed for producing nanoscale-oriented nanorods from zinc oxide on an acrylic polymer. The technology makes it possible to achieve different filling of the surface with zinc oxide nanorods. The nanorods is partially fused into the polymer; the cross section of the nanorods is rather close to an elongated ellipse. It is shown that, with intense abrasion, no delamination of the nanorods from the acrylic polymer is observed. The zinc oxide nanorods abrades together with the acrylic polymer. Zinc oxide nanorods luminesces with the wavelength most preferable for the process of photosynthesis in higher plants. It was shown that plants grown under the obtained material grow faster and gain biomass faster than the control group. In addition, it was found that on surfaces containing zinc oxide nanorods, a more intense formation of such reactive oxygen species as hydrogen peroxide and hydroxyl radical is observed. Intensive formation of long-lived, active forms of the protein is observed on the zinc oxide coating. The formation of 8-oxoguanine in DNA in vitro on a zinc oxide coating was shown using ELISA method. It was found that the multiplication of microorganisms on the developed material is significantly hampered. At the same time, eukaryotic cells of animals grow and develop without hindrance. Thus, the material we have obtained can be used in photonics (photoconversion material for greenhouses, housings for LEDs), and it is also an affordable and non-toxic nanomaterial for creating antibacterial coatings.

scholarly journals Crystal growth of nanostructured zinc oxide nanorods from the seed layer

2018 ◽  
Vol 36 (3) ◽  
pp. 477-482
Author(s):  
B.O. Adetoye ◽  
A.B. Alabi ◽  
T. Akomolafe ◽  
P.B. Managutti ◽  
N. Coppede ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Absorption Spectrum ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Visible Range ◽  
Zno Nanostructures ◽  
Sem Images ◽  
Zno Nanostructure ◽  
Vis Spectroscopy ◽  
Fto Glass

AbstractOne-dimensional (1D) zinc oxide (ZnO) nanostructures (nanorods) were synthesized on a glass slide and fluorine-doped tin oxide (SnO2/F or FTO) coated glass (FTO/glass) by a wet chemical method. The structural, morphological and optical analyses of the as-deposited ZnO nanostructures were performed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and UV-Vis spectroscopy, respectively. The XRD results showed that the nanostructures as-deposited on the glass and the FTO/glass substrates were of ZnO wurtzite crystal structure, and the crystallite sizes estimated from the (0 0 2) planes were 60.832 nm and 64.876 nm, respectively. The SEM images showed the growth of densely oriented ZnO nanorods with a hexagonal-faceted morphology. The UV-Vis absorption spectrum revealed high absorbance properties in the ultraviolet range and low absorbance properties in the visible range. The optical energy band gap of the ZnO nanostructure was estimated to be 3.87 eV by the absorption spectrum fitting (ASF) method.

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