Morphology-Controlled Synthesis of 1D ZnO Nanostructures by Hydrothermal Technique

2011 ◽  
Vol 266 ◽  
pp. 17-21
Author(s):  
Zhi Duan Cai ◽  
Lin Dong ◽  
Guo Xi Cao ◽  
Xing Yan Zhang ◽  
Shao Kang Guan
Keyword(s):  
Room Temperature ◽  
Controlled Synthesis ◽  
Curing Process ◽  
Zno Nanostructures ◽  
Curing Time ◽  
Photoluminescence Spectra ◽  
Structural And Optical Properties ◽  
Hydrothermal Technique ◽  
Room Temperature Photoluminescence

A two-step hydrothermal synthesis technique has been developed to obtained 1D ZnO nanostructures with adjustable aspect ratio and size distribution. The pre-curing process has important influence on the morphological, structural and optical properties. The LO phonons of the nanowires obtained by pre-curing for 24 h exhibit slight batho-shift in comparison with nanorods. The increase of the intensity ratio of ultraviolet to visible emissions in room-temperature photoluminescence spectra show the improvement in the quality of ZnO nanostructures as the pre-curing time prolonged. The fitting result of EX energy at T=0 is 3.382 and 3.370 eV for ZnO nanowires and nanorods, respectively.

Structural and Optical Characterization of ZnO Nanofilms Deposited by CBD-AμW

2015 ◽  
Vol 1766 ◽  
pp. 151-158 ◽  
Author(s):  
J. Díaz-Reyes ◽  
R. S. Castillo-Ojeda ◽  
J. E. Flores-Mena ◽  
J. Martínez-Juárez
Keyword(s):  
Room Temperature ◽  
Optical Characterization ◽  
Xrd Analysis ◽  
Photoluminescence Spectra ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Glass Substrates ◽  
Corning Glass

ABSTRACTZnO was grown by Chemical Bath Deposition technique activated by microwaves (CBD-AμW) on corning glass substrates. The ZnO structural and optical properties are studied as a function of the urea concentration in the growth solution. ZnO chemical stoichiometry was determined by Energy-dispersive X-ray spectroscopy (EDS). The XRD analysis and Raman scattering reveal that ZnO deposited thin films showed hexagonal polycrystalline phase wurtzite type. The Raman spectra present four main peaks associated to the modes E2high, (E2high-E2low), E2low and an unidentified vibrational band observed at 444, 338, 104 and 78 cm-1. The E2low mode involves mainly Zn atoms motion in the unit cell and the E2high mode is associated to oxygen motion. The observed emission peaks in the room temperature photoluminescence spectra are associated at vacancies of zinc and oxygen in the lattice.

Growth and Optical Properties of ZnO Low-Dimensional Nanostructures

2008 ◽  
Vol 8 (3) ◽  
pp. 1101-1109 ◽  
Author(s):  
Yichun Liu ◽  
Yanhong Tong
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Two Dimensions ◽  
Zno Nanostructures ◽  
Photoluminescence Spectra ◽  
Temperature Dependent ◽  
Room Temperature Photoluminescence ◽  
Low Dimensional ◽  
Low Temperature Photoluminescence ◽  
Temperature Dependent Photoluminescence

Recent studies on the growth of ZnO nanostructures and their optical properties were reviewed. Using different methods, a variety of ZnO nanostructures, including quantum dots nanotowers, nanotubes, nanorods, nanowires, and nanosheets, displaying zero, one, and two dimensions, have been synthesized. The growth of ZnO low-dimensional nanostructures has been demonstrated. Their optical properties have been studied by means of room-temperature photoluminescence spectra, low-temperature photoluminescence spectra, temperature-dependent photoluminescence spectra, and pressure-dependent photoluminescence spectra. The optical properties can be adjusted by the surface features of ZnO low-dimensional nanostructures. The strong exciton emission has been observed in some nanostructures, showing promising potential in nanodevice applications.

Photoluminescence Characterization of SiGe/Si Quantum-Well Wire Structures

1995 ◽  
Vol 379 ◽  
Author(s):  
S. Nilsson ◽  
H. P. Zeindl ◽  
A. Wolff ◽  
K. Pressel
Keyword(s):  
Quantum Well ◽  
Room Temperature ◽  
Molecular Beam ◽  
Optical Quality ◽  
Photoluminescence Spectra ◽  
Single Quantum Well ◽  
Quantum Well Wire ◽  
Carbon Interstitial

ABSTRACTLow-temperature photoluminescence measurements were performed in order to probe the optical quality of SiGe/Si quantum-well wire structures fabricated by electron-beam lithography and subsequent reactive ion etching, having the patterned polymethylmethacrylate resist as an etch mask. In addition, one set of quantum-well wire structures was post-treated by means of annealing in a hydrogen environment. Our results show that even for the smallest wires of about 100nm in width, the wires exhibit phonon-resolved photoluminescence spectra, similar to that from the molecular beam eptitaxially grown SiGe single quantum well which was used as starting material for the patterning process. After the patterning process a new sharp peak appears in the photoluminescence spectra at 0.97eV in photon energy. Our investigation suggests that this feature is introduced by damage during the patterning process and most probably identical to the G-line, which previously was identified as originating from the dicarbon centre (substitutional carbon-interstitial carbon) in Si. This centre is known to be a very common endproduct of irradiating Si near room temperature which is the case at our patterning process.

In2O3 Thin Films Prepared on TiAlN Substrates Using a Triethylindium and Oxygen Mixture

2007 ◽  
Vol 124-126 ◽  
pp. 1597-1600
Author(s):  
Hyoun Woo Kim ◽  
Sun Keun Hwang ◽  
Won Seung Cho ◽  
Tae Gyung Ko ◽  
Seung Yong Choi ◽  
...  
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Room Temperature ◽  
Light Emission ◽  
Xrd Analysis ◽  
Oxygen Mixture ◽  
Photoluminescence Spectra ◽  
Sem Images ◽  
Room Temperature Photoluminescence ◽  
Visible Light Emission

This paper reports the fabrication of indium oxide (In2O3) films using a triethylindium and oxygen mixture. The deposition has been carried out on TiAlN substrates (200-350°C). We have established the correlation between the substrate temperature and the structural properties. The films deposited at 300-350°C were polycrystalline, whereas those deposited at 200°C was close to amorphous. XRD analysis and SEM images indicated that the films grown at 350°C had grained structures with the (222) preferred orientation. The room-temperature photoluminescence spectra of the In2O3 films exhibited a visible light emission.

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).

scholarly journals Facile and Clean Solution Synthesis of Large-Scale ZnO Nanorods Assisted with Aliquat 336

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Qiang Huang ◽  
Jianping Liu
Keyword(s):  
Raman Spectroscopy ◽  
Optical Properties ◽  
Large Scale ◽  
Chemical Method ◽  
Room Temperature ◽  
Zno Nanorods ◽  
Aliquat 336 ◽  
Photoluminescence Spectra ◽  
Solution Synthesis ◽  
Room Temperature Photoluminescence

A facile and clean fabrication of large-scale ZnO nanorods assisted with Aliquat 336 using aqueous chemical method is reported. As prepared, samples were characterized using XRD, EDS, SEM, TEM, and HRTEM. The optical properties were measured by Raman spectroscopy and room temperature photoluminescence spectra.

Photoluminescence and Structural Characteristics of SnO2 Nanopetals Synthesized by Thermal Evaporation

2010 ◽  
Vol 152-153 ◽  
pp. 697-701
Author(s):  
Bing Wang ◽  
Ling Li
Keyword(s):  
Room Temperature ◽  
Thermal Evaporation ◽  
Structural Characteristics ◽  
The Self ◽  
Silicon Substrates ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Sno2 Nanostructure

A new nanostructure, (2D) nanopetal of SnO2, has been grown on single silicon substrates by Au-Ag alloying catalyst assisted carbothermal evaporation of SnO2. Field emission scanning electron microscopy (FESEM), x-ray diffraction (XRD) and Raman are employed to identify the morphology and structure of the synthesized productions. Room-temperature photoluminescence (PL) is used to characterize the luminescence of SnO2 nanostructure. Three new peaks at 356, 450 and 489 nm in the measured photoluminescence spectra are observed, implying that more luminescence centers exist in SnO2 nanopetals due to nanocrystals and defects. The growth of the SnO2 nanopetals is discussed on the basis of the self-catalyst mechanism.

Composition Dependent Optical Properties of Zn1-xCdxS Nanostructures

2013 ◽  
Vol 669 ◽  
pp. 335-339
Author(s):  
Xue Yun Song ◽  
Xiu Xi Wang ◽  
Xiang Hua Zeng ◽  
Yong Zhang ◽  
Yi Pei Hu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Optical Properties ◽  
Band Gap ◽  
Mole Fraction ◽  
Room Temperature ◽  
Lattice Structure ◽  
Red Shift ◽  
Alloy Nanoparticles ◽  
Photoluminescence Spectra ◽  
Room Temperature Photoluminescence

Zn1-xCdxS alloy nanoparticles have been prepared via solvothermal approach. The effects of the mole fraction of Cd on the nanoparticles’ structure, size and photoluminescence spectra were investigated. It shows that with increase in mole fraction of Cd, the lattice structure of Zn1-xCdxS changes from cubic to hexagonal, and the size of these nanoparticles varied within 6-40nm. Room temperature photoluminescence measurements show an intense red shift from 518nm to 662nm. And the band gap energies from 2.3 to 3.54eV can be realized for the Zn1-xCdxS nanopartices. Furthermore, it is found that the conversion of Methylene Blue (MB) using Zn0.6Cd0.4S as the photocatalyst was up to 97% after 2h of irradiation.

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