Substrate Effect on Well-Aligned ZnO Nanorods Growth Using a Low Temperature Solution Method

2015 ◽  
Vol 1109 ◽  
pp. 491-494
Author(s):  
J. Rouhi ◽  
M.H. Mamat ◽  
Kevin Alvin Eswar ◽  
F.S. Husairi ◽  
Salman A.H. Alrokayan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Solution Method ◽  
Zno Nanorods ◽  
Substrate Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Radio Frequency Sputtering ◽  
Temperature Solution ◽  
Scanning Electron ◽  
Seed Layers

The effect of various substrates on the morphology of ZnO nanorods synthesized by a low temperature solution method has been investigated. ZnO seed layers on the substrates were prepared by radio-frequency sputtering. ZnO nanorods have been characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM. FESEM results showed that hexagon-shaped ZnO nanorods with a diameter in the range of 30 nm to 80 nm and a length of about 1 μm were formed. The sharp (0002) peak in the XRD spectra indicates that the synthesized nanorods are single crystalline, grown along the [0001] direction. These findings have shown that the morphology of ZnO nanorods strongly depend on the substrate.

Substrate Effect on Growth Behaviour of Well-Aligned ZnO Nanorods Using an Aqueous Solution Method

2014 ◽  
Vol 695 ◽  
pp. 147-150
Author(s):  
Ramazanali Dalvand ◽  
Shahrom Mahmud
Keyword(s):  
Solution Method ◽  
Zno Nanorods ◽  
Growth Behaviour ◽  
Uniform Size ◽  
Glass Substrates ◽  
Coverage Density ◽  
Radio Frequency Sputtering ◽  
Temperature Solution ◽  
Aqueous Solution Method ◽  
Seed Layers

The substrate effects on the morphology and photoluminescence (PL) properties of ZnO nanorods synthesized by a low temperature solution method has been investigated. ZnO seed layers on the substrates were prepared by radio-frequency sputtering. ZnO nanorods have been characterized by PL spectra and field emission scanning electron microscopy (FESEM). FESEM results showed that the nanorods grown on the polyethylene terephthalate (PET) substrate had the most uniform size and the highest coverage density compared with the Si and glass substrates. PL measurements showed that the ZnO nanorods grown on the Si substrate had the best performance that may be attributed to higher crystallization and the low density of defects in the ZnO nanostructures. These findings have shown that the morphology and PL of ZnO nanorods strongly depend on the substrate.

Hydrothermal Growth of ZnO Nanorods along the Ultra-Thin ZnO Seed Layer Prepared by Magnetron Sputtering

2016 ◽  
Vol 675-676 ◽  
pp. 130-133
Author(s):  
Wissawat Sakulsaknimitr ◽  
Kanyakorn Teanchai ◽  
Mati Horprathum ◽  
Chanunthorn Chananonnawathorn ◽  
Saksorn Limwichean ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Seed Layer ◽  
Treatment Process ◽  
Zno Nanorods ◽  
Annealing Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron ◽  
Seed Layers

ZnO nanorods were grown on magnetron sputtered ultra-thin ZnO seed layers through a hydrothermal method. Before ZnO nanorods growth, the ultra-thin ZnO seed layer has been annealed at temperatures ranging from 100 to 400°C in air. The influence of annealing treatment on the crystalline structure of the ultra-thin ZnO seed layers has been investigated by X-ray diffraction (XRD). The size and density of final prepared ZnO nanorods were investigated by field-emission scanning electron microscopy (FE-SEM). It was found that the length and the aspect ratio of the ZnOnanorods can be readily tuned by control of the ZnO ultra-thin seeds layer which results from the annealing treatment process.

Rectifying Behavior of Aligned ZnO Nanorods on Mg0.3Zn0.7O Thin Film Template

2011 ◽  
Vol 364 ◽  
pp. 35-39 ◽  
Author(s):  
Salina Muhamad ◽  
Abu Bakar Suriani ◽  
Mohamad Hafiz Mamat ◽  
Rafidah Ahmad ◽  
Mohamad Rusop
Keyword(s):  
Thin Film ◽  
Zno Nanorods ◽  
Thermionic Emission ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hexagonal Shape ◽  
Semiconductor Junction ◽  
Vertically Aligned ◽  
Scanning Electron

Rectifying behavior more than 3 orders of aligned zinc oxide (ZnO) nanorods grown on Mg0.3Zn0.7O thin film template using chemical bath deposition method was observed, giving a barrier height of 0.75 eV, and the ideality factor achieved was almost 6, which was analyzed using thermionic emission theory. Field emission scanning electron microscope (FESEM) images revealed that the grown ZnO was in hexagonal shape, uniformly distributed and in vertically aligned form. The crystallinity of the sample being studied using X-ray diffraction (XRD), where the highest peak was found at (002) phase, confirming that high crytallinity of ZnO was attained. The effect of metal/semiconductor junction between metal and aligned ZnO nanorods was discussed in further details.

Magnesium Nitrate as Additive for Synthesis of Mg(OH)2 Nanoparticles

2012 ◽  
Vol 198-199 ◽  
pp. 99-102
Author(s):  
Qing Gang Kong ◽  
Hai Yan Qian
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Low Temperature ◽  
Magnesium Nitrate ◽  
Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Size And Morphology ◽  
Scanning Electron

Magnesium nitrate was used as additive for synthesis of Mg(OH)2 (MH) nanoparticles at low temperature (70°C). Mg(OH)2 nanoparticles have platelet-like structure and approximately 40-60nm in thicknesses. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were applied to characterize the crystal phase. The supersaturation degree of solution effects the size and morphology of MH nanoparticles.

SYNTHESIS AND CHARACTERIZATION OF ZnO NANORODS AND NANOWIRES USING PVP AS CAPPING

2009 ◽  
Vol 08 (03) ◽  
pp. 285-287 ◽  
Author(s):  
M. ESKANDARI ◽  
V. AHMADI ◽  
Sh. AHMADI
Keyword(s):  
Solution Method ◽  
Zno Nanorods ◽  
Green Emission ◽  
Zno Nanowires ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Solution Method ◽  
Air Atmosphere ◽  
20 Nm

In this study, ZnO nanowires are synthesized via ZnO nanorods at low temperature by using zinc acetate dehydrate and polyvinylpyrrolidone as precursor and capping, respectively. We use chemical solution method for synthesis of ZnO nanowires. Samples are characterized by means of scanning electron microscopy and X-ray diffraction. First, the nanorods are prepared at 300°C temperature, and then they are put into the furnace under air atmosphere at 450°C for 2 h. It is observed that nanowires with 20 nm diameter are produced. Photoluminescence spectra of nanorods and nanowires are compared. It shows that intensity of ultraviolet peak in the nanowires decreases but in contrast the intensity of green emission part increases. This is because, the surface effects such as oxygen vacancies increase in the structures of ZnO .

SiO2ZrO2 Thin Films as Low Temperature NO2 and O3 Sensors

2015 ◽  
Vol 1088 ◽  
pp. 81-85 ◽  
Author(s):  
T.N. Myasoedova ◽  
Victor V. Petrov ◽  
Nina K. Plugotarenko ◽  
Dmitriy V. Sergeenko ◽  
Galina Yalovega ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Low Temperature ◽  
Annealing Temperature ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Operating Temperatures ◽  
Scanning Electron

Thin SiO2ZrO2films were prepared, up to 0.2 μm thick, by means of the sol–gel technology and characterized by a Scanning electron microscopy and X-ray diffraction. It is shown the presence of monoclinic, cubic and tetragonal phases of ZrO2in the SiO2matrix. The crystallites sizes depend on the annealing temperature of the film and amount to 35 and 56 nm for the films annealed at 773 and 973 K, respectively. The films resistance is rather sensitive to the presence of NO2and O3impurity in air at lower operating temperatures in the range of 30-60°C.

scholarly journals Microstructural Study of ZnO Nanostructures by Rietveld Analysis

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Francisco Pola-Albores ◽  
Francisco Paraguay-Delgado ◽  
Wilber Antúnez-Flores ◽  
Patricia Amézaga-Madrid ◽  
Edna Ríos-Valdovinos ◽  
...  
Keyword(s):  
Zno Nanorods ◽  
Grazing Incidence ◽  
Rietveld Analysis ◽  
Zinc Nitrate ◽  
Bragg Condition ◽  
X Ray Diffraction ◽  
Microstructural Study ◽  
X Ray ◽  
Textured Materials ◽  
Scanning Electron

ZnO nanorods were synthesized by induced seeds by chemical bath deposition using hexamethylenetetramine (HMT) as a precipitant agent and zinc nitrate (ZN) as Zn2+source at 90°C. The influence of reactants ratio was studied from 2 to 0.25 ZN/HMT molar. The results obtained by scanning electron microscopy confirm that the diameter of nanorods was affected directly by the concentration of both zinc and OH−sources. Nanotubes (hollow nanorods) were obtained with high HMT concentrations and were turning over nanorods as HMT concentration decreased. Microstructural information was obtained by Rietveld refinement of grazing incidence X-ray diffraction data. These results evidence low-textured materials with oriented volumes less than 18% coming from (101) planes in Bragg condition.

Synthesis of ZnO Nanorods with Tunable Aspect Ratio

2012 ◽  
Vol 724 ◽  
pp. 205-208
Author(s):  
Li Yan Zhang ◽  
Fen Wang ◽  
Jian Feng Zhu
Keyword(s):  
Electron Microscopy ◽  
Aspect Ratio ◽  
Ph Value ◽  
Zno Nanorods ◽  
Heat Treating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preferred Direction ◽  
Transmission Electron ◽  
Scanning Electron

ZnO nanorods were prepared by heat treating of aqueous zinc acetate treated with organic of PVA. The products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The results indicate that the as synthesized ZnO are hexagonal wurtzite nanorods with the maximum aspect ratio of 10:1 (100 nm in diameter and about 1 μm in length). The morphology of nanorods was formed by the regulation of appropriate organic under a pH value of 8.5. The growth mechanism of ZnO is proposed that the nanocrystals grow along a preferred direction in a growth tunnel provided by organics.

Effects of Strong Carbide-Forming Elements on Low Temperature Salt-Bath Chromizing

2011 ◽  
Vol 214 ◽  
pp. 646-650 ◽  
Author(s):  
Jin Ling Ye ◽  
Feng Ye
Keyword(s):  
Low Temperature ◽  
Layer Thickness ◽  
Plasma Nitriding ◽  
White Layer ◽  
Salt Bath ◽  
Chromium Concentration ◽  
X Ray Diffraction ◽  
White Layer Thickness ◽  
X Ray ◽  
Scanning Electron

The microstructure, phase structure, white layer thickness and chromium concentration, microhardness of the chromized layer of T10 steel and 3Cr2W8V steel by low temperature salt-bath chromizing with plasma nitriding are contrasted. The chromizing process is investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD). Results show that the strong carbide-forming elements (Cr, W, V) obstruct the diffusion of chromium and carbon, the white layer thickness and microhardness, surface chromium concentration of the chromized layer are reduced. A chromized layer of T10 steel with average 7.3μm in thickness, 84.47% in surface chromium concentration and 1300HV-1400HV in microhardness is formed on the substrate by chromizing at 610°C for 6h, as compared to the chromized layer of 3Cr2W8V steel with average 3.3μm in thickness, 74.27% in surface chromium concentration and 1200HV-1300HV in microhardness.

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