scholarly journals Synthesis of Zinc Oxide Nanostructure by Chemical Bath Deposition (CBD) Method: Influence of Growth Time towards Nanostructure Characteristics

2019 ◽  
Vol 8 (4) ◽  
pp. 6891-6896
Keyword(s):  
Zinc Oxide ◽  
Chemical Bath Deposition ◽  
Indium Tin Oxide ◽  
Morphological Changes ◽  
Structural Characteristics ◽  
Ultra Violet ◽  
Vital Role ◽  
Growth Time ◽  
Zno Nanostructures ◽  
Zno Nanostructure

Growth of zinc oxide (ZnO) nanostructure on seeded indium tin oxide (ITO) via chemical bath deposition were presented in this study. Growth time is believed to have vital role in order to control the physical (morphology), optical and structural characteristics of ZnO nanostructures. Several growth time of ZnO nanostructure were varied (1 H – 3.5 H) as the purpose to investigate its effect towards the growth of ZnO nanostructures, as well as their characteristics. In this study, the influence of growth time was determined using field emission scanning electron microscope (FESEM), ultra-violet visible spectrometer (UV-Vis) and x-ray diffraction (XRD). Based on the results obtained, morphological, optical and structural characteristics of ZnO nanostructure thin films grown at various growth time present different characteristics and properties. According to the results obtained, it is proved that growth time is a vital parameter to control the ZnO nanostructure growing process. ZnO nanostructure morphological changes significantly with the changes of the growing time process. As well as optical properties, the changes of absorbance and transmittance value influence the optical energy band gap of ZnO nanostructure in this study, which is the average value is 3.31 -3.40 eV. The structural characteristic of the ZnO nanostructure also affected significantly with the difference of growth time, where the crystallinity is improved with the longer growth time.

scholarly journals Study on the effect of growth-time and seed-layers of Zinc Oxide nanostructured thin film prepared by the hydrothermal method for liquefied petroleum gas sensor application

BIBECHANA ◽  
2018 ◽  
Vol 16 ◽  
pp. 145-153
Author(s):  
Guna Nidha Gnawali ◽  
Shankar P Shrestha ◽  
Khem N Poudyal ◽  
Indra B Karki ◽  
Ishwar Koirala
Keyword(s):  
Thin Film ◽  
Zinc Oxide ◽  
Gas Sensor ◽  
Sheet Resistance ◽  
Measurement Unit ◽  
Growth Time ◽  
Zno Nanostructures ◽  
Liquefied Petroleum Gas ◽  
Nanostructured Thin Film ◽  
Seed Layers

Gas sensors are devices that can convert the concentration of an analytic gas into an electronic signal. Zinc oxide (ZnO) is an important n-type metal oxide semiconductor which has been utilized as gas sensor for several decades. In this work, ZnO nanostructured films were synthesized by a hydrothermal route from ZnO seeds and used as a liquefied petroleum gas (LPG) sensor. At first ZnO seed layers were deposited on glass substrates by using spin coating method, then ZnO nanostructured were grown on these substrates by using hydrothermal growth method for different time duration. The effect of growth time and seed layers of ZnO nanostructured on its structural, optical, and electrical properties was studied. These nanostructures were characterized by X-ray diffraction, scanning electron microscopy, optical spectroscopy, and four probes sheet resistance measurement unit. The sensing performances of the synthetic ZnO nanostructures were investigated for LPG.XRD showed that all the ZnO nanostructures were hexagonal crystal structure with preferential orientation. SEM reviled that the size of nanostructure increased with increase in growth time. Band gap and sheet resistance for ZnO nanostructured thin film decreased with increase in growth time. ZnO nanostructured thin film showed high sensitivity towards LPG gas. The sensitivity of the film is observed to increase with increase in no of seed layers as well as growth time. The dependence of the LPG sensing properties on the different growth time of ZnO nanostructured was investigated. The sensing performances of the film were investigated by measured change in sheet resistance under expose to LPG gas. BIBECHANA 16 (2019) 145-153

Optical Characteristics of Chemically Prepared ZnO Nanostructures on Silica Modified Polyaniline Nanocomposites

2014 ◽  
Vol 548-549 ◽  
pp. 196-200 ◽  
Author(s):  
Katherine M. Emphasis ◽  
Reynaldo M. Vequizo ◽  
Rolando T. Canditato ◽  
Majvell Kay G. Odarve ◽  
Filchito Renè G. Bagsican ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Fourier Transform ◽  
Ftir Spectroscopy ◽  
Chemical Bath Deposition ◽  
In Situ Polymerization ◽  
Visible Region ◽  
Optical Characteristics ◽  
Zno Nanostructures ◽  
Vis Spectroscopy

Zinc oxide (ZnO) on silica modified polyaniline (SM-PANI) was prepared via chemical bath deposition and in situ polymerization. The optical characteristics of the nanocomposites were investigated using ultraviolet-visible (UV-Vis) spectroscopy. The bands showed higher absorbance in the visible region. Fourier transform infrared (FTIR) spectroscopy revealed that there is an interaction between SM-PANI and ZnO.

NANOSTRUCTURAL ZnO FABRICATED BY VAPOR-PHASE TRANSPORT IN AIR

2004 ◽  
Vol 18 (02) ◽  
pp. 225-232 ◽  
Author(s):  
C. X. XU ◽  
X. W. SUN ◽  
B. J. CHEN ◽  
C. Q. SUN ◽  
B. K. TAY
Keyword(s):  
Zinc Oxide ◽  
Growth Time ◽  
Zinc Oxide Nanostructures ◽  
X Ray Diffraction ◽  
Vapor Phase Transport ◽  
X Ray ◽  
Zno Nanostructure ◽  
Oxide Nanostructures ◽  
Vapor Liquid Solid Mechanism ◽  
Phase Transport

Nanostructural zinc oxide has been successfully fabricated by heating the mixture of ZnO and graphite powders in air. The growth of these zinc oxide nanostructures with respect to the growing time and temperature has been studied. The morphologies and the crystal structures have been characterized by scanning electronic microscopy and the X-ray diffraction. The results indicated that ZnO nanostructure formed mainly along the crystal orientation [002] on silicon substrate at moderate temperatures. The crystallization was improved by prolonging growth time and the morphologies mainly depended on the distribution of the growth temperature. The growth process was attributed to vapor-liquid-solid mechanism.

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 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.

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.

Effect of Metal Catalysts Type and Annealing Time on the Growth of Zinc Oxide Nanostructures by Thermal Vapor Deposition Method

2014 ◽  
Vol 1024 ◽  
pp. 60-63
Author(s):  
Aimi Bazilah Rosli ◽  
Khairul Aimi Yusof ◽  
Sukreen Hana Herman ◽  
Muhammad Hazmi Johari ◽  
Shafinaz Sobihana Shariffudin ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Annealing Time ◽  
Chemical Vapour ◽  
Metal Catalysts ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Au Catalyst ◽  
Zno Nanostructure ◽  
Glass Substrates ◽  
Buffer Solutions

This paper reports the results of zinc oxide (ZnO) nanostructure growth on different types of metal catalysts, namely gold and platinum, and also the effect of annealing time of the metal catalysts prior to the deposition of ZnO nanostructures. The metal catalysts layers with 15 nm thickness were deposited on glass substrates by sputter coater and then annealed in air ambient for 15 and 30 min at 500 °C. ZnO nanostructure was then deposited on the metal catalysts by thermal chemical vapour deposition (TCVD) method. We found that the Au catalyst morphologies varied with the annealing time, and the growth morphology of the ZnO followed the morphology of the Au catalyst. The morphology of the metal catalysts and ZnO nanostructures were characterized using field emission scanning electron microscopy (FESEM). The grown ZnO nanostructures were tested for their ability for extended gate field effect transistor (EGFET) sensor application. The samples were attached to the gate of an NFET and were dipped in acid and alkali buffer solutions while the gate voltage was measured. We found that the extended gate gave different voltage in buffer solutions with different pH which indicated that the samples can act as the extended gate of an EGFET sensor.

scholarly journals AZO-Based ZnO Nanosheet MEMS Sensor with Different Al Concentrations for Enhanced H2S Gas Sensing

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3377
Author(s):  
Yempati Nagarjuna ◽  
Jun-Cong Lin ◽  
Sheng-Chang Wang ◽  
Wen-Tse Hsiao ◽  
Yu-Jen Hsiao
Keyword(s):  
Zinc Oxide ◽  
Gas Sensing ◽  
Growth Time ◽  
Optimal Conditions ◽  
Gas Concentration ◽  
Zno Nanostructure ◽  
Mems Sensor ◽  
Different Temperatures ◽  
Micro Electromechanical System ◽  
Different Gases

The properties of H2S gas sensing were investigated using a ZnO nanostructure prepared with AZO (zinc oxide with aluminium) and Al surfaces which were developed on a MEMS (Micro Electromechanical System) device. Hydrothermal synthesis was implemented for the deposition of the ZnO nanostructure. To find the optimal conditions for H2S gas sensing, different ZnO growth times and different temperatures were considered and tested, and the results were analysed. At 250 °C and 90 min growth time, a ZnO sensor prepared with AZO and 40 nm Al recorded an 8.5% H2S gas-sensing response at a 200 ppb gas concentration and a 14% sensing response at a gas concentration of 1000 ppb. The dominant sensing response provided the optimal conditions for the ZnO sensor, which were 250 °C temperature and 90 min growth time. Gas sensor selectivity was tested with five different gases (CO, SO2, NO2, NH3 and H2S) and the sensor showed great selectivity towards H2S gas.

scholarly journals Influence of pH, Precursor Concentration, Growth Time, and Temperature on the Morphology of ZnO Nanostructures Grown by the Hydrothermal Method

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
G. Amin ◽  
M. H. Asif ◽  
A. Zainelabdin ◽  
S. Zaman ◽  
O. Nur ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Aspect Ratio ◽  
Ph Value ◽  
Precursor Concentration ◽  
Growth Time ◽  
Zno Nanostructures ◽  
Alkaline Ph ◽  
Starting Solution ◽  
Initial Ph ◽  
Influence Of Ph

We investigated the influence of the pH value, precursor concentration (C), growth time and temperature on the morphology of zinc oxide (ZnO) nanostructures. The pH of the starting solution was varied from 1.8 to 12.5. It was found that the final pH reaches an inherent value of 6.6 independently of the initial pH solution. Various ZnO structures of nanotetrapod-like, flower-like, and urchin-like morphology were obtained at alkaline pH (8 to 12.5) whereas for pH solution lower than 8 rod-like nanostructures occurred. Moreover, we observed the erosion of the nanorods for a pH value less than 4.6. By changing the concentrations the density and size were also varied. On going from a high (C>400 mM) to lower (C<25 mM)C, the resulted ZnO nanostructures change from a film to nanorods (NRs) and finally nanowires (NWs). It was also found that the length and diameter of ZnO NRs follow a linear relation with time up to 10 hours, above which no further increase was observed. Finally the effect of growth temperature was seen as an influence on the aspect ratio.

Evaluation of the Effect of Nanoparticles Zinc Oxide/Camellia sinensis Complex on the Kidney of Rats Treated with Monosodium Glutamate: Antioxidant and Histological Approaches

2019 ◽  
Vol 20 (7) ◽  
pp. 542-550 ◽  
Author(s):  
Nahla S. El-Shenawy ◽  
Reham Z. Hamza ◽  
Fawziah A. Al-Salmi ◽  
Rasha A. Al-Eisa
Keyword(s):  
Zinc Oxide ◽  
Camellia Sinensis ◽  
Zinc Oxide Nanoparticles ◽  
Morphological Changes ◽  
Monosodium Glutamate ◽  
Oxide Nanoparticles ◽  
High Dose ◽  
Enzymatic Antioxidants ◽  
Zno Nps ◽  
Tea Extract

Background: Zinc oxide nanoparticles (ZnO NPs) are robustly used biomedicine. Moreover, no study has been conducted to explore the consequence of green synthesis of ZnO NPs with Camellia sinensis (green tea extract, GTE) on kidneys of rats treated with monosodium glutamate (MSG). Methods: Therefore, the objective of the research was designed to explore the possible defensive effect of GTE/ZnO NPs against MSG-induced renal stress investigated at redox and histopathological points. Results: The levels of urea and creatinine increased as the effect of a high dose of MSG, in addition, the myeloperoxidase and xanthine oxidase activates were elevated significantly with the high dose of MSG. The levels of non-enzymatic antioxidants (uric acid, glutathione, and thiol) were decreased sharply in MSG-treated rats as compared to the normal group. Conclusion: The data displayed that GTE/ZnO NPs reduced the effects of MSG significantly by reduction of the level peroxidation and enhancement intracellular antioxidant. These biochemical findings were supported by histopathology evaluation, which showed minor morphological changes in the kidneys of rats.

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