Influence of Ammonia Solution on Zinc Oxide Nanostructures by Hydrothermal Growth

2014 ◽  
Vol 875-877 ◽  
pp. 1549-1553 ◽  
Author(s):  
Z.B. Huang ◽  
X.P. Zou ◽  
G.Q. Yang ◽  
X.M. Lv ◽  
C.L. Wei ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Zno Nanorods ◽  
Precursor Solution ◽  
Ammonia Solution ◽  
Zinc Nitrate ◽  
Hydrothermal Growth ◽  
Zinc Oxide Nanostructures ◽  
Oxide Nanostructures

In previous work, ZnO nanorods and nanoflowers were synthesized on indium-tin-oxide (ITO) substrates by hydrothermal growth at low temperature ,using the different concentrations of equimolar (1:1) zinc nitrate Zn (NO3)26H2O and methenamine (C6H12N4) mixed as precursors solution, and adding ammonia solution to control the pH levels. In this paper, for comparison, the same experiment without ammonia solution was also discussed. SEM, XRD were utilized to characterize morphologies and crystal structures of ZnO. It was indicated that the pH of precursor solution leads to the significantly changes in the nanostructured ZnO. Besides, a hierarchical structure of some of the micro/nanotubes was obtained .The possible growth mechanism is discussed in this work.

Influence of Precursor Solution Concentration on Zinc Oxide Nanostructures by Hydrothermal Growth

2014 ◽  
Vol 875-877 ◽  
pp. 562-566
Author(s):  
Zong Bo Huang ◽  
X.P. Zou ◽  
G.Q. Yang ◽  
X.M. Lv ◽  
C.L. Wei ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Precursor Solution ◽  
Solution Concentration ◽  
Ammonia Solution ◽  
Zinc Nitrate ◽  
Hydrothermal Growth ◽  
Zinc Oxide Nanostructures ◽  
Oxide Nanostructures ◽  
Precursor Solution Concentration

In this paper, various ZnO nanostructures, such as rods, flowers were grown on indium-tin-oxide (ITO) substrates by hydrothermal growth at low temperature, using the different concentrations of equimolar (1:1) zinc nitrate (Zn (NO3)26H2O) and methenamine (C6H12N4) mixed as precursors solution, and adding ammonia solution to control the pH levels. SEM, XRD were utilized to characterize morphologies and crystal structures of ZnO. It was indicated that the concentration of precursor solution leads to the significantly changes in the nanostructured ZnO. The possible growth mechanism is discussed in this work.

Characterization of Urea versus HMTA in the Preparation of Zinc Oxide Nanostructures by Solution-Immersion Method Grown on Gold-Seeded Silicon Substrate

2011 ◽  
Vol 364 ◽  
pp. 45-49 ◽  
Author(s):  
Azlinda Ab Azlinda ◽  
Zuraida Khusaimi ◽  
Saifollah Abdullah ◽  
Mohamad Rusop
Keyword(s):  
Zinc Oxide ◽  
Silicon Substrate ◽  
High Surface ◽  
High Surface Area ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zno Nanostructures ◽  
Zinc Oxide Nanostructures ◽  
Immersion Method ◽  
Oxide Nanostructures

Zinc oxide (ZnO) nanostructures prepared by immersion method were successfully grown on gold-seeded silicon substrate using Zinc nitrate hexahydrate (Zn (NO3)2.6H2O) as a precursor, separately stabilized with non-toxic urea (CH4N2O) and hexamethylene tetraamine (HMTA). The effect of changing the stabilizer of ZnO solution on the crystal structure, morphology and photoluminescence properties of the resultant ZnO is investigated. X-ray diffraction of the synthesized ZnO shows hexagonal zincite structure. The morphology of the ZnO was characterized using Field Emission Scanning Electron Microscope (FESEM). The growth of ZnO using urea as stabilizer shows clusters of ZnO nanoflower with serrated broad petals were interestingly formed. ZnO in HMTA showed growth of nanorods. The structures has high surface area, is a potential metal oxide nanostructures to be develop for optoelectronic devices and chemical sensors. The formation of ZnO nanostructures is found to be significantly affected by the stabilizer.

ZnO Nanorod Arrays and Nanowires by Hydrothermal Growth

2010 ◽  
Vol 123-125 ◽  
pp. 811-814 ◽  
Author(s):  
Yi Su ◽  
Xiao Ping Zou ◽  
Xiang Min Meng ◽  
Gong Qing Teng ◽  
Gang Qiang Yang ◽  
...  
Keyword(s):  
Zno Nanorods ◽  
Ammonia Solution ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Hydrothermal Growth ◽  
Nitrate Hexahydrate ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Facile Fabrication

We are reporting here on an inexpensive and facile fabrication method for ZnO nanorod arrays by hydrothermal growth at low temperature (90°C). In our experiment, ZnO nanostructures were grown on glass substrate using an equimolar (0.1M) aqueous solution of Zn(NO3)2•6H2O (zinc nitrate hexahydrate) and C6H12N4 (HMTA) as precursors solution, and using ammonia solution to controlling the pH levels. It enable easily obtained arrayed ZnO nanorods on substrate, and nanowires which grown on nanorod arrays were identified after about 1 month in the air. The growth process of nanorods and the formation mechanism of nanowires were investigated.

GROWTH MECHANISMS OF TIN OXIDE AND ZINC OXIDE NANOSTRUCTURES FROM VAPOUR PHASE

2009 ◽  
Author(s):  
LUCIO ZANOTTI ◽  
MINGZHENG ZHA ◽  
DAVIDE CALESTANI ◽  
ROBERTO MOSCA ◽  
ANDREA ZAPPETTINI
Keyword(s):  
Zinc Oxide ◽  
Tin Oxide ◽  
Vapour Phase ◽  
Growth Mechanisms ◽  
Zinc Oxide Nanostructures ◽  
Oxide Nanostructures

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.

Crystal Structural Studies of ZnO Nanorods and their Band Gaps

2014 ◽  
Vol 938 ◽  
pp. 71-75
Author(s):  
Muhd Firdaus Kasim ◽  
Norlida Kamarulzaman ◽  
Suraya Ahmad Kamil
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Zno Nanorods ◽  
Chelating Agent ◽  
Band Gaps ◽  
Zinc Oxide Nanostructures ◽  
X Ray Diffraction ◽  
Soft Chemistry ◽  
Oxide Nanostructures ◽  
Vis Spectroscopy

Zinc oxide nanostructures have been done by many scientists but amongst the soft chemistry methods, chelating agents are normally used. In this work zinc oxide nanostructures have been synthesized using a soft chemistry method without using a chelating agent. The precursor were annealed at various temperatures of 400 °C, 500 °C, 600 °C, 700 °C, 800 °C and 1200 °C for 24 h. Nanostructures are found with rod-like shapes and they are compared with larger oval morphology. X-Ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), and UV-Vis spectroscopy were used for characterization. XRD results confirm that all peaks were pure and single phase without the presence of any impurities. It was found from electron microscopy results that the morphology of the materials annealed at 400 °C possesses nanorod shape and as the calcination temperature increases, the material consists of mixed rod, spherical and oval shapes. The aspect ratio of the materials decreases when the annealing temperature increases. The absorption edges of the materials annealed at higher temperatures show a red-shift implying that narrowing of the band gaps occur in the materials. Band gap were evaluated and found to be between 3.32 to 3.19 eV.

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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