The effect of induced strains on photoluminescence properties of ZnO nanostructures grown by thermal evaporation method

2016 ◽  
Vol 30 (07) ◽  
pp. 1650081 ◽  
Author(s):  
Yaser Arjmand ◽  
Hosein Eshghi
Keyword(s):  
Main Parameter ◽  
Morphological Study ◽  
Thermal Evaporation ◽  
Zinc Powder ◽  
Hexagonal Structure ◽  
Optical Data ◽  
Metallic Zinc ◽  
Zno Nanostructures ◽  
Photoluminescence Properties ◽  
Thermal Evaporation Method

In this paper, ZnO nanostructures have been synthesized by thermal evaporation process using metallic zinc powder in the presence of oxygen on [Formula: see text]-Si (100) at different distances from the boat. The structural and optical characterizations have been carried out. The morphological study shows various shape nanostructures. XRD data indicate that all samples have a polycrystalline wurtzite hexagonal structure in such a way that the closer sample has a preferred orientation along (101) while the ones farther are grown along (002) direction. From the structural and optical data analysis, we found that the induced strains are the main parameter controlling the UV/green peaks ratios in the PL spectra of the studied samples.

Low-Temperature Growth of Flower-Shaped UV-Emitting ZnO Nanostructures on Steel Alloy by Thermal Evaporation

2007 ◽  
Vol 7 (12) ◽  
pp. 4421-4427 ◽  
Author(s):  
Ahmad Umar ◽  
S. H. Kim ◽  
J. H. Kim ◽  
Y. K. Park ◽  
Y. B. Hahn
Keyword(s):  
Thermal Evaporation ◽  
Hexagonal Phase ◽  
Zinc Powder ◽  
Hexagonal Structure ◽  
Structural Defects ◽  
Metal Catalyst ◽  
Steel Alloy ◽  
Zno Nanostructures ◽  
Uv Emission ◽  
Wurtzite Hexagonal Phase

Flower-shaped ZnO nanostructures, containing the triangular-shaped petals (sharpened tips and wider bases) have been achieved by simple thermal evaporation of high purity metallic zinc powder in the presence of oxygen at 440 °C on steel alloy substrate without the use of metal catalyst or additives. Detailed structural studies confirm that the obtained flower-shaped nanostructures are single crystalline and possesses a wurtzite hexagonal structure, grown along the c-axis in the [0001] direction. Raman and room temperature photoluminescence analysis substantiate a wurtzite hexagonal phase with a good crystal quality and a strong UV emission at 378 nm, respectively, indicating few or no structural defects. Additionally, a detailed possible growth mechanism has also been discussed.

EFFECT OF W-DOPING ON MORPHOLOGY, STRUCTURAL AND OPTICAL PROPERTIES OF ZnO NANOSTRUCTURES SYNTHESIZED VIA THERMAL EVAPORATION

2012 ◽  
Vol 26 (27) ◽  
pp. 1250176 ◽  
Author(s):  
HOSEIN ESHGHI ◽  
YASER ARJMAND
Keyword(s):  
Room Temperature ◽  
Thermal Evaporation ◽  
Hexagonal Structure ◽  
Zno Nanostructures ◽  
Structural And Optical Properties ◽  
Thermal Evaporation Method ◽  
Violet Emission ◽  
Pl Spectra ◽  
Uv Emission ◽  
Oxygen Gas

Undoped and W -doped ZnO nanostructures were prepared by heating Zn and WO 3 powders in the presence of oxygen gas without any catalyst, using the thermal evaporation method at 950°C. Samples were characterized by FESEM images, also EDS, XRD and PL spectra. FESEM images showed the formation of nanowires in the undoped sample and porous nanostructures as flat-surface granules with various sizes in the doped samples. XRD spectra of the samples confirmed the formation of wurtzite hexagonal structure with (002) as the preferred orientation, while its intensity has reduced as the doping concentration has increased. Meanwhile, the room temperature PL spectra have indicated this variation is in conjunction with the reduction in the intensity of UV emission and appearance of a violet emission at 420 nm (2.95 eV).

A Review on Thermal Evaporation Method to Synthesis Zinc Oxide as Photocatalytic Material

2021 ◽  
Vol 31 ◽  
pp. 55-63
Author(s):  
Najiha Hamid ◽  
Syahida Suhaimi ◽  
Muhammad Zamir Othman ◽  
Wan Zakiah Wan Ismail
Keyword(s):  
Zinc Oxide ◽  
Vapour Deposition ◽  
Thermal Evaporation ◽  
Three Dimensional ◽  
Oxide Material ◽  
Physical Vapour Deposition ◽  
Evaporation Process ◽  
Zno Nanostructures ◽  
Thermal Evaporation Method ◽  
Photocatalytic Material

Zinc oxide (ZnO) is a metal oxide material that is interested in research due to its possibility of bandgap tailoring, doping with various types of materials as well as being able to form many structures from zero-dimensional to three-dimensional structures. All these properties allow ZnO to be used in broad applications. Several research studies have been reported on the synthesis of ZnO nanostructures by the physical vapour deposition (PVD) technique. One of the potential PVD technique is thermal evaporation process. Generally, the technique is used to grow thin-film but researchers have found a potential to be used in the growth of nanostructures due to the ability to provide high crystallinity with homogeneous and uniform nanostructures. This analysis will therefore explore more about the thermal evaporation synthesized ZnO nanostructures and the application as photocatalyst material in wastewater treatment.

Morphological and structural characterization of Pb:ZnS nanostructure films deposited by simple thermal evaporation

2021 ◽  
Author(s):  
Bassam Abdallah ◽  
M. Kakhia ◽  
W. Zetoune ◽  
M. Alwazzeh
Keyword(s):  
Zinc Sulfide ◽  
Photoelectron Spectroscopy ◽  
Thermal Evaporation ◽  
Hexagonal Structure ◽  
Morphological Development ◽  
Sem Images ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Morphological Modification ◽  
Xrd Patterns

ZnS nanostructure films were deposited by a thermal evaporation method. Two films were prepared; the first was zinc sulfide (undoped ZnS) and the second was Pb-doped zinc sulfide (Pb:ZnS). X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDX) techniques were employed to investigate the element contents of the two films; they were found to be stoichiometric. Surface and growth evolution of films were explored by SEM images and found to have morphological development from spherical forms into nanostructure lookalike Taraxacum erythrospermum (Dandelion) with increasing the Pb from 0 wt.% to 12 wt.%. A structural study was performed using XRD patterns. The films have ZnS hexagonal structure (002) preferential orientation with various Pb percentages. In the doped sample, ZnS nanostructure and pores and nanowires (NWs) were formed with a mean diameter less than 50 nm; the undoped film had dense structure and was thin. This study illustrated the influence of Pb doped on the morphological modification of ZnS films.

Hierarchical ZnO Nanostructures: Growth and Optical Properties

2008 ◽  
Vol 8 (12) ◽  
pp. 6355-6360
Author(s):  
Ahmad Umar ◽  
A. Al. Hajry ◽  
S. Al-Heniti ◽  
Y.-B. Hahn
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
Hexagonal Phase ◽  
Hierarchical Structures ◽  
Zinc Powder ◽  
Zno Nanostructures ◽  
Hierarchical Nanostructures ◽  
Uv Emission ◽  
Wurtzite Hexagonal Phase

Growth of hierarchical ZnO nanostructures composed of ZnO nanoneedles have been achieved via simple thermal evaporation process by using metallic zinc powder in the presence of oxygen at low temperature of 460 °C on silicon substrate without the use of any kind of metal catalysts or additives. It is confirmed by detailed structural studies that the as-grown hierarchical nanostructures are single crystalline with a wurtzite hexagonal phase and nanoneedles of these structures are grown along the c-axis in the [0001] direction. The Raman-scattering analysis substantiates a wurtzite hexagonal phase with a good crystal quality for the as-grown products. Room-temperature photoluminescence (PL) exhibits a strong UV emission at 380 nm confirming the excellent optical properties of as-synthesized hierarchical structures. A plausible growth mechanism is also proposed to clearly understand the growth process of the synthesized structures.

Field emission from lotiform-like ZnO nanostructures synthesized via thermal evaporation method

2006 ◽  
Vol 84 (1-2) ◽  
pp. 165-169 ◽  
Author(s):  
P. Zhang ◽  
H. Qi ◽  
X. Zhang ◽  
Q. Zhao ◽  
Y. Tian ◽  
...  
Keyword(s):  
Field Emission ◽  
Thermal Evaporation ◽  
Zno Nanostructures ◽  
Thermal Evaporation Method ◽  
Evaporation Method

The Influence of Nitrogen Plasma on Crystalline Structure and Optical Properties

2017 ◽  
Vol 883 ◽  
pp. 22-26
Author(s):  
Suparut Narksitipan
Keyword(s):  
Optical Properties ◽  
Crystalline Structure ◽  
Thermal Evaporation ◽  
Plasma Deposition ◽  
Nitrogen Plasma ◽  
Hexagonal Structure ◽  
Zno Films ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Evaporation Method

In this research, zinc oxide (ZnO) films were prepared by thermal evaporation method at temperature between 400-600°C for 60 min. Then, ZnO films were deposited by nitrogen cold plasma technique. The power, frequency and voltage of plasma generated at 100 W, 50 KHz and 5 KV, respectively. These films were deposited by plasma deposition for 15-60 min. The aim of this research is to study the effect of nitrogen plasma on the crystalline structure and optical properties of ZnO film. Crystalline structure, elemental compositions, morphological and optical properties were characterized by using X-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDS), scanning electron microscopy (SEM) and UV-VIS spectrophotometer, respectively. It was found that the ZnO films preparation via thermal evaporation method at temperature of 500°C showed the highest crystalline with hexagonal structure. After plasma deposition for 15, 30 and 60 min, ZnO films were amorphous. Optical transmittance values decreased and the optical band gap decreased from 3.14 to 3.06 eV with increasing in the plasma time.

Temperature-Controlled Catalytic Growth and Photoluminescence Properties of ZnO Nanostructures

2007 ◽  
Vol 31 ◽  
pp. 68-70 ◽  
Author(s):  
P.T. Huy ◽  
T.T. An ◽  
N.D. Chien ◽  
Do Jin Kim
Keyword(s):  
Thermal Evaporation ◽  
Zno Nanostructures ◽  
Critical Factors ◽  
Photoluminescence Properties ◽  
Catalytic Growth ◽  
Synthesis Conditions ◽  
Nano Structures ◽  
Temperature Controlled ◽  
The Difference ◽  
Scanning Electron

ZnO nanostructures with different morphologies of nanorods, nanoneedles, nanowires, and nanobelts have been synthesized by thermal evaporation of pure ZnO micropowder. Based on the appearance of the as-synthesized products observed by field emission scanning electron microscope (FE-SEM), we show that substrate temperature and catalyst are the critical factors for the formation of different morphologies of ZnO nanostructures. The photoluminescence (PL) properties of the ZnO nanostructures were investigated. The difference in PL spectra both in intensity and structure for the different ZnO nanostructures are presented. We demonstrate that under appropriate synthesis conditions, highly crystallized and defect-free ZnO nano-structures can be obtained.

Substrate Dependent Morphologies and Luminescence Properties of ZnO Nanostructures Prepared by Thermal Evaporation

2009 ◽  
Vol 60-61 ◽  
pp. 278-282 ◽  
Author(s):  
Bin Ping Zhuang ◽  
Fa Chun Lai ◽  
Li Mei Lin ◽  
Ming Bao Lin ◽  
Yan Qu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Thermal Evaporation ◽  
Zinc Powder ◽  
Substrate Material ◽  
Zno Nanostructures ◽  
X Ray Diffraction ◽  
Pure Zinc ◽  
X Ray ◽  
Structure Morphology ◽  
Quartz Substrates

High density ZnO nanostructures were fabricated on Au coated Si and quartz substrates through once and the same oxidative evaporation of pure zinc powder. The coated side of the substrate was intentionally positioned in two directions of face and back to the zinc sources. Structure, morphology and optical properties of the samples were investigated by scanning electron microscopy, X-ray diffraction, Raman spectra and room temperature photoluminescence measurements. The results showed that the samples on the different substrates with different directions have three different morphologies, including film-, rod- and comb-like nanostructures. Photoluminescence spectra of the samples showed the various bands centered in UV (380-390 nm), blue (470-490 nm), green (500-550 nm) and orange (610-620 nm) region. It demonstrates that the substrate material and the direction of substrate significantly affect the growth of ZnO nanostructures.

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