scholarly journals Influence of the Hydrothermal Method Growth Parameters on the Zinc Oxide Nanowires Deposited on Several Substrates

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Concepción Mejía-García ◽  
Elvia Díaz-Valdés ◽  
Marco Alberto Ayala-Torres ◽  
Josué Romero-Ibarra ◽  
Máximo López-López
Keyword(s):  
Growth Parameters ◽  
Zinc Acetate Dihydrate ◽  
Band Gap Energy ◽  
Zinc Nitrate ◽  
Zno Nanowires ◽  
Nitrate Hexahydrate ◽  
Oxide Nanowires ◽  
Si Substrates ◽  
Glass Substrates ◽  
Xrd Patterns

We report the synthesis of ZnO nanowires grown on several substrates (PET, glass, and Si) using a two-step process: (a) preparation of the seed layer on the substrate by spin coating, from solutions of zinc acetate dihydrate and 1-propanol, and (b) growth of the ZnO nanostructures by dipping the substrate in an equimolar solution of zinc nitrate hexahydrate and hexamethylenetetramine. Subsequently, films were thermally treated with a commercial microwave oven (350 and 700 W) for 5, 20, and 35 min. The ZnO nanowires obtained were characterized structurally, morphologically, and optically using XRD, SEM, and UV-VIS transmission, respectively. XRD patterns spectra revealed the presence of Zn(OH)2on the films grown on glass and Si substrates. A preferential orientation alongc-axisdirections for films grown on PET substrate was observed. An analysis by SEM revealed that the growth of the ZnO nanowires on PET and glass is better than the growth on Si when the same growth parameters are used. On glass substrates, ZnO nanowires less than 50 nm in diameter and between 200 nm and 1200 nm in length were obtained. The ZnO nanowires band gap energy for the films grown on PET and glass was obtained from optical transmission spectra.

Synthesis and Characterization of Zinc Oxide Nanowires Grown Hydrothermally on Glass Substrate

2013 ◽  
Vol 787 ◽  
pp. 427-431
Author(s):  
Concepción Mejía-García ◽  
Elvia Díaz-Valdéz ◽  
M.A. Ayala-Torres ◽  
J. Romero-Labias ◽  
M.G. de La Cruz-Vicencio ◽  
...  
Keyword(s):  
Seed Layer ◽  
Zinc Nitrate ◽  
Microwave Oven ◽  
Zno Nanowires ◽  
Bandgap Energy ◽  
Nitrate Hexahydrate ◽  
Oxide Nanowires ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Xrd Patterns

We report the synthesis of ZnO nanowires grown on glass using a two-step process: (a) preparation of the seed layer, and (b) growth of the nanostructures. First step:solutions of zinc acetate dehydrate and 1-propanol of 10 mM concentrationwere spin coated on glass at 2000 rpm for 58 s. A seed layer was obtained after three layers of spin coating. Second step: vertical ZnO nanowires were grown by dipping the substrate in a 25 mMequimolarsolution of zinc nitrate hexahydrate and hexamethylenetetramine. Subsequently, films were thermally treated with a commercial microwave oven at different power settings (350 and 700 W) for 5, 20 and 35 min. The ZnO nanowires obtained were characterized optical and morphologically. Scanning electron microscopy analysis showed that the size of ZnO nanowires was less than 50 nm in diameter and around 500 nm in length. XRD patterns revealed that when low power in the microwave oven was utilized, the presence of Zn (OH)2 on the films is observed. The ZnO nanowires bandgap energy was obtained from optical transmission spectra.

Influence of Ammonium in Zinc Oxide Nanostructures Hydrothermally Grown on Glass Substrate

2014 ◽  
Vol 709 ◽  
pp. 341-345
Author(s):  
Concepción Mejía-García ◽  
Elvia Díaz-Valdés ◽  
Marco Alberto Ayala-Torres ◽  
Alejandro Sánchez-Sánchez ◽  
Ana María Paniagua-Mercado ◽  
...  
Keyword(s):  
Zinc Acetate Dihydrate ◽  
Hydrothermal Process ◽  
Zinc Nitrate ◽  
Morphological Properties ◽  
Ammonium Concentration ◽  
Heating Process ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Glass Substrates

We present the synthesis of ZnO nanostructures grown by the hydrothermal method using the rapid microwave heating process. First, 10 mM solutions of zinc acetate dihydrate and 1-propanol were three cycles spin coated on glass substrates at 2000 rpm by 70 s, 90 s and 90 s, respectively. Second, nanostructures were then grown by dipping the substrates in a solution of zinc nitrate hexahydrate, polyethyleneimine (PEI), hexamethylenetetramine and ammonia. The hydrothermal process were carried out with a commercial microwave at 300, and 600 W power settings during 20 min. The structural and morphological properties were investigated using X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The influence of the ammonium concentration in the morphology of the nanostructures was analyzed.Keywords: ZnO, nanostructures, XRD, SEM, spin coating, ammonium, hydrothermal process.

ZnO Nanostructures Obtained by Mist-Atomization Method Growth on Different Au-Seeded Substrates Temperature

2015 ◽  
Vol 1109 ◽  
pp. 603-607
Author(s):  
A.N. Afaah ◽  
N.A.M. Asib ◽  
Aadila Aziz ◽  
M. Rusop ◽  
Ruziana Mohamed ◽  
...  
Keyword(s):  
Glass Substrate ◽  
Room Temperature ◽  
Nitrate Solution ◽  
Zinc Nitrate ◽  
Morphological Properties ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
Glass Substrates ◽  
Uv Emission ◽  
Surface Morphologies

Mist-atomization deposition method was applied in order to grow ZnO nanostructures with various surface morphologies. ZnO was deposited from the mixture of zinc nitrate hexahydrate (Zn (NO3)2.6H2O) and stabilizer, hexamethylenetetramine (HMTA, C6H12N4) aqueous solutions onto Au-seeded glass substrate. The mixture was sprayed onto the surface of Au-seeded glass substrate at various growth temperatures of room temperature (RT), 100, 200, and 300 °C. The obtained structures were characterised by room-temperature photoluminescence (PL), field emission scanning electron microscopy (FESEM), and UV-VIS-NIR spectrophotometer. It is found that ZnO growth on 300 °C substrate temperature shows the best absorbance properties and highest UV emission peak with denser distribution amongst all. The optical and morphological properties of sprayed ZnO nanostructures largely depend on the substrates temperature during spraying the zinc nitrate solution and on the Au-seeded glass substrates.

Template Assisted Growth of Zinc Oxide-Based Nanowires and Piezoelectric Properties

2013 ◽  
Vol 829 ◽  
pp. 757-761 ◽  
Author(s):  
Nooshin Sadat Ayati ◽  
Elahe Akbari ◽  
Seyed Pirooz Marashi ◽  
Shahyar Saramad
Keyword(s):  
Zinc Oxide ◽  
Zinc Nitrate ◽  
Zno Nanowires ◽  
Structure Characterization ◽  
X Ray Diffraction ◽  
Contact Mode ◽  
Oxide Nanowires ◽  
Nitrate Precursor ◽  
Potentiostatic Electrodeposition

In this paper, we report on the synthesis of ZnO nanowires via templated electrochemical deposition. ZnO nanowire arrays were fabricated by potentiostatic electrodeposition in track-etched polycarbonate (PC) membrane. The electrolyte was aqueous solution containing zinc nitrate precursor. The electrodeposition process involves the electroreduction of nitrate ions to alter the local pH and precipitation of the metal oxide within the pores. The morphology analysis and structure characterization of the ZnO nanowires were carried out using conventional scanning electron microscopy (SEM) and X-Ray diffraction. To check the piezoelectric characteristics of the zinc oxide nanowires, the AFM microscope is used in contact mode. The scanned area was 5µm*5µm and the affected force was 30nN. In result of scanning each nanowire with conductive AFM tip in contact mode, a current peak which had a width smaller than topography peak was fabricated. This is due to semi-conductivity and piezoelectricity characteristics of Nanowires.

Fabrication and characterization of a single-bridge nanorod between microgap electrodes

2014 ◽  
Vol 31 (2) ◽  
pp. 104-107 ◽  
Author(s):  
Qazi Humayun ◽  
Muhammad Kashif ◽  
Uda Hashim
Keyword(s):  
Zinc Acetate Dihydrate ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Zinc Nitrate ◽  
Wet Etching ◽  
Nitrate Hexahydrate ◽  
Zno Nanorod ◽  
Uv Detector ◽  
Etching Technique ◽  
Content Type

Purpose – The purpose of this study was to investigate the performance of a single-bridge ZnO nanorod as a photodetector. Design/methodology/approach – The fabrication of the design sensor with ∼6-μm gap Schottky contacts and bridging of the ZnO nanorod were based on conventional photolithography and wet-etching technique. Prior to bridging, the ZnO nanorods were grown by the hydrothermal process. The 0.35 M seed solution was prepared by dissolving zinc acetate dihydrate in 2-methoxyethanol, and monoethanolamine, which acts as a stabilizer, was added drop-wise. Before starting the solution deposition, and oxide, titanium (Ti) and gold (Au) layer deposition, p-type (100) silicon substrate was cleaned with Radio Corporation of America (RCA1) and RCA2, followed by dipping in diluted hydrofluoric acid. The aged solution was dropped onto the surface of the Au microgap structure, using a spin coater at a spinning speed of 3,000 rpm for 45 seconds, and then dried at 300°C for 15 minutes, followed by annealing at 400°C for 1 hour. The hydrothermal growth was carried out in an aqueous solution of zinc nitrate hexahydrate (0.025 M) and hexamethyltetramine (0.025 M). Findings – In this study, ZnO nanorods were grown on a SiO2 substrate by the hydrothermal method. Microgap electrodes with ∼6-μm spacing were achieved by using the wet-etching process. After the growth process, an area-selective mask was utilized to reduce the number of rods between the nearby gap areas. The obtained single ZnO nanorod was tested for the UV-sensing application. The single ZnO nanorod photodetector exhibited a UV photoresponse, thereby indicating potential as a cost-effective UV detector. The response and recovery times of the fabricated device were 65 and 95 seconds, respectively. Structural analysis was captured using X-ray Diffraction (XRD), whereas surface morphology was determined using scanning electron microscopy. Originality/value – This paper demonstrates the effect of UV photon on a single-bridge ZnO nanorod between microgap electrodes.

scholarly journals Preparation and Characterization of Zno Nano particles Prepared by Hydrothermal Method

2019 ◽  
Vol 24 (3) ◽  
pp. 91
Author(s):  
Mohammed Ajmi Abd1 ◽  
Khalid Hamdi Razeg1 ◽  
Raad M.S Al-haddad2
Keyword(s):  
Quantum Confinement Effect ◽  
Hydrothermal Process ◽  
Blue Shift ◽  
Band Gap Energy ◽  
Zinc Nitrate ◽  
Nano Particles ◽  
Surface Topology ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
Afm Analysis

In this study,the nanoparticles of zinc oxide were readily prepared  through Hydrothermal process by using zinc nitrate hexahydrate, and Sodium hydroxide as aprecursors. The surface topology, and crystalline structure of prepared ZnO nanoparticles were studied. X-ray diffraction (XRD) revealed that the prepared ZnO nano particles is highly crystalline, having (wurtzite) crystal structure.  The optical analysis by UV–vis showed that these ZnO nano particles have considerable blue shift in the optical band gap energy (Eg = 4.9eV), and this may be to the  quantum confinement effect of nano particles. The FT-IR results shows the  existence of OH, COO, H2O groups the characteristic vibrational modes of Zn–O were identified. and AFM analysis showed that the diameters of the ZnO particles is in ananometer range of (70-74)nm.   http://dx.doi.org/10.25130/tjps.24.2019.052 

OPTICAL CHARACTERIZATION OF ZnO NANOROD ARRAYS GROWN FROM SOLUTION

2010 ◽  
Vol 09 (05) ◽  
pp. 447-451 ◽  
Author(s):  
WALTER WATER ◽  
TE-HUA FANG ◽  
LIANG-WEN JI ◽  
CHING-CHIN LEE
Keyword(s):  
Zno Nanorods ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Current Voltage ◽  
Ito Glass

ZnO nanorods were synthesized on ZnO / ITO glass substrates using an aqueous solution of zinc nitrate hexahydrate and hexamethylenetetramine. The effects of hexamethylenetetramine concentration on the crystalline structure and surface morphology of ZnO nanorods were investigated. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the crystalline characteristics and microstructures of the nanorod arrays. Ultraviolet/visible spectroscopy and photoluminescence (PL) spectra were used to characterize the optical properties of ZnO nanorods. Larger and brighter photoluminescent ZnO nanorods were obtained from solutions with higher hexamethylenetetramine concentrations. A nanogenerator based on ZnO nanorod arrays was fabricated in the investigation. The nanogenerator's current–voltage characteristics with Schottky-like behavior were discussed.

The Effect of Solution Temperature on Electrodeposit-ZnO Thin Film

2013 ◽  
Vol 594-595 ◽  
pp. 1131-1135 ◽  
Author(s):  
Fariza Mohamad ◽  
Connie Anak Abang ◽  
Nik Hisyamudin Muhd Nor ◽  
Masanobu Izaki
Keyword(s):  
Thin Film ◽  
Zinc Nitrate ◽  
Solution Temperature ◽  
Zno Thin Film ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Nitrate Hydrate ◽  
Atomic Force ◽  
Xrd Patterns

Zinc Oxide (ZnO) has been successfully electrodeposited on a fluorine doped tin oxide (FTO) coated glass substrates using a simple aqueous solution containing zinc nitrate hydrate by low temperature galvanostatic electrolysis. The solution temperature of zinc nitrate hydrate was varied from 60°C to 75°C in order to investigate the effect of solution temperature on electrodeposit-ZnO thin film. The properties of ZnO film were investigated by X-ray diffraction (XRD), Field-Emission Scanning electron microscope (FE-SEM) and Atomic force microscopy (AFM). The solution temperature shows a significant effect on structural and morphological of deposit-ZnO. The XRD patterns exhibited the increment of (002)-ZnO peak when the solution temperature increased and the highest peak was observed at 75°C. The morphology of ZnO was changed from planar to nanopillar with the solution temperature. In conclusion, ZnO nanopillar with an excellent structural properties was obtained at solution temperature of 75°C.

Enhancing the photocatalytic degradation of selected chlorophenols using Ag/zno nanocomposites

MRS Advances ◽  
2018 ◽  
Vol 3 (36) ◽  
pp. 2129-2136
Author(s):  
Kate Kotlhao ◽  
Fanyana M. Mtunzi ◽  
Vusumzi Pakade ◽  
Neelan Laloo ◽  
Ikechukwu P. Ejidike ◽  
...  
Keyword(s):  
Scanning Transmission Electron Microscopy ◽  
Silver Content ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
Water Contaminants ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Xrd Patterns

Chlorophenols are among the priority listed water contaminants due to their estrogenic, mutagenic or carcinogenic health effects. The Ag/ZnO nanocomposites (NCs) were synthesized, characterized and tested for photacatalytic degradation of chlorophenols in water. The synthesis was done using zinc nitrate hexahydrate (ZnNO3. 6H2O) precursor and sodium hydroxide (NaOH). Silver nitrate (AgNO3) was added to ZnO and reduced with sodium brohydride to produce the silver nanoparticles (NPs) within the ZnO structure. The silver content was varied from 1, 3 and 5wt% for optimisation. The nanocomposites were characterised using ultraviolet - visible spectroscopy (UV-Vis), photolumniscence (PL), x-ray diffraction (XRD), and scanning transmission electron microscopy (STEM). The nanocomposites were tested for their photocatalytic properties on 2- chlorophenol (CP), 2- chlorophenol (CP) and 2,4- dichlorophenol (DCP) in water. The UV-Vis results showed that, as the amount of silver was increased a gradual slight red shift was observed. The XRD patterns for Ag/ZnO exhibited peaks that were characteristic of the hexagonal wurzite structure and peaks characteristic for Ag appeared at 38.24o, 44.37o, 64.67oand 77.58ocorresponding to (111), (200), (220) and (311) reflection planes. STEM results showed the presence of Ag in ZnO with ZnO appearing as rods shapes. The EDX elemental analysis confirmed the presence of Ag in the Ag/ZnO nanocomposites with no contaminants peaks. On testing the nanocomposites for phohotocatalytic degradation of chlorophenols, addition of Ag to ZnO improved degradation of the chlorophenols compared to the pristine ZnO.

Synthesis and Characterization of Zinc Oxide Nanostructures by Different Sonication Period

2014 ◽  
Vol 925 ◽  
pp. 110-114 ◽  
Author(s):  
Nurulnadia Sarip ◽  
Che Ani Norhidayah ◽  
Sharul Ashikin Kamaruddin ◽  
Farhanahani Mahmud ◽  
Siti Nooraya Mohd Tawil ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zno Nanorods ◽  
Wide Band ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zinc Oxide Nanostructures ◽  
Glass Substrates ◽  
Vis Spectroscopy ◽  
Acoustic Wave Devices

Zinc oxide (ZnO) is a wide band gap semiconductor material (3.37 eV) with numerous present applications such as varistors, surface acoustic wave devices and future biomedical applications. ZnO nanorods were grown under specific growth condition by an inexpensive and simple, chemical bath deposition method on ZnO seeded glass substrates. Study of the ZnO nanorods over different precursors, i.e zinc acetate dehydrate and zinc nitrate hexahydrate, and sonication period ranging from 0 to 120 seconds by field emission scanning electron microscope (FESEM), including the nanorod size and the surface morphology, will be demonstrated in this paper. Characterization of the ZnO film using both X-ray diffraction (XRD) and UV-Vis spectroscopy will be established in determining the optimal composition along with the optical properties, respectively.

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