Study on Al-Doped ZnO Nanofibers Prepared by Electro-Spinning Technique

2011 ◽  
Vol 301-303 ◽  
pp. 55-59
Author(s):  
Qin Li ◽  
Hai Ming Zhang
Keyword(s):  
Zinc Acetate ◽  
Sol Gel ◽  
Hexagonal Structure ◽  
Diameter Ratio ◽  
Electrospinning Technique ◽  
Emission Properties ◽  
Uv Emission ◽  
Zno Nanofibers ◽  
Doped Zno ◽  
High Length

PVA/ zinc acetate sol–gel were fabricated into thin PVA/ zinc acetate composited fibers films by using electrospinning technique. After annealing of the above precursor fibers, ZnO:Al nanofibers with a diameter of 100-700 nm and high length-diameter ratio were obtained successfully. The ZnO:Al nanofibers were characterized by XRD, SEM, and PL, respectively. The XRD results show that Al-doped ZnO nanofibers present ZnO hexagonal structure. PL spectra display that the ZnO: Al nano-fibers have a strong UV emission properties.

Preparation and Optical Property of Mn-Doped ZnO Nanorods

2011 ◽  
Vol 189-193 ◽  
pp. 643-647
Author(s):  
Chuan Sheng Chen ◽  
Tian Gui Liu ◽  
Liang Wu Lin ◽  
Xi Li Xie ◽  
Zhen Wu Ning ◽  
...  
Keyword(s):  
Optical Property ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Blue Emission ◽  
X Ray Diffraction ◽  
Uv Emission ◽  
Transmission Electron ◽  
Doped Zno ◽  
Electron Microscopes ◽  
Mn Doped

Mn-doped ZnO (Zn0.97Mn0.03O) nanorods were synthesized by sol-gel method combined with subsequent heat treatment. The structure and optical property of Mn-doped ZnO nanorods were studied by x-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), and fluorescence. The results of electron microscopes illuminate that the Zn0.97Mn0.03O nanorods are prepared at calcinations of 450 under the protection of nitrogen. The Zn0.97Mn0.03O nanorods are composed of small particles of size 20–30 nm. Fluorescence spectra of Zn0.97Mn0.03O nanorods exhibit that there are two very strong blue emission peaks at 451 nm and 461nm except a strong UV emission at 396 nm.

Preparation of ZnAc/PVP Composite Fibers and ZnO Nanofibers

2014 ◽  
Vol 665 ◽  
pp. 296-299
Author(s):  
Qing Nan Zhang ◽  
Dong Yan Tang ◽  
Zai Qian Yu ◽  
Hai Tao Lv
Keyword(s):  
Zinc Acetate ◽  
Polymer Concentration ◽  
Composite Fibers ◽  
Electrospinning Technique ◽  
Spinning Process ◽  
Zno Nanofibers

Zinc acetate (ZnAc)/PVP composite fibers were prepared by electrospinning technique and pure inorganic ZnO nanofibers were then obtained after the calcination of the composite fibers at 600°C for 2.5h. The effects of the parameters during the spinning process on the composite fibers and ZnO nanofibers were investigated. Uniform in diameters and continuous nanofibers without liquid beads could be obtained with the polymer concentration of 15%, the spinning voltage of 11kV, the receiving distance of 20cm and the rate of sample propulsion of 1.5uL/min. The XRD detection demonstrated the construction of ZnO for nanofibers after the calcinations of the composite fibers.

scholarly journals Unveiling Semiconductor Nanostructured Based Holmium-Doped ZnO: Structural, Luminescent and Room Temperature Ferromagnetic Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2611
Author(s):  
Guy L. Kabongo ◽  
Gugu H. Mhlongo ◽  
Mokhotjwa S. Dhlamini
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Surface Defects ◽  
Ostwald Ripening ◽  
Room Temperature Ferromagnetism ◽  
Sol Gel ◽  
Research Work ◽  
Synthesis Method ◽  
Hexagonal Structure ◽  
Doped Zno

This research work describes the synthesis of ZnO nanostructures doped with Ho3+ ions using a conventional sol–gel synthesis method. The nanostructured produced exhibited a wurtzite hexagonal structure in both ZnO and ZnO:Ho3+ (0.25, 0.5, 0.75 mol%) samples. The change in morphology with addition of Ho3+ dopants was observed, which was assigned to Ostwald ripening effect occurring during the nanoparticles’ growth. The photoluminescence emission properties of the doped samples revealed that Ho3+ was emitting through its electronic transitions. Moreover, reduced surface defects were observed in the Holmium doped samples whose analysis was undertaken using an X-ray Photoelectron Spectroscopy (XPS) technique. Finally, enhanced room temperature ferromagnetism (RT-FM) for Ho3+-doped ZnO (0.5 mol%) samples with a peak-to-peak line width of 452 G was detected and found to be highly correlated to the UV–VIS transmittance results.

The Structural and Optical Properties of Al Doped ZnO Thin Film

2015 ◽  
Vol 727-728 ◽  
pp. 280-283
Author(s):  
Ping Cao ◽  
Yue Bai ◽  
Zhi Qu
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Absorption Spectroscopy ◽  
Sol Gel ◽  
Zno Thin Film ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Uv Emission ◽  
Doped Zno

Al doped ZnO thin film have been prepared by a sol-gel method. The structural, and optical properties of the sample were investigated. X-ray diffraction and X-ray absorption spectroscopy analyses and UV absorption spectroscopy analyses indicate that Al3+ substitute for Zn2+ without changing the wurtzite structure. With the Al doping, the visible emission increased and the UV emission decreased, which is attributed to the increase of O vacancies and Zn interstitials.

Synthesis of Al-Doped ZnO Nanorod Arrays on Al-Doped ZnO Seed Layer and their Properties

2015 ◽  
Vol 1109 ◽  
pp. 266-270
Author(s):  
M.N. Wahida ◽  
M.H. Mamat ◽  
Mohamad Rusop
Keyword(s):  
Seed Layer ◽  
Sol Gel ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Immersion Method ◽  
Uv Emission ◽  
Doped Zno

Aluminium (Al)-doped zinc oxide (ZnO) nanorod arrays have been synthesized on a glass substrate, where the seed layer is Al-doped ZnO thin film as well, using the sonicated sol–gel immersion method. The nanorods structure was synthesized by preparing a solution 0.0026 M of zinc nitrate hexahydrate (Zn (NO3)2·6H2O, 98%, Systerm) as a precursor, 0.1 M hexamethylenetetramine (HMT, C6H12N4, 99%, Aldrich) as a stabilizer and 0.001M aluminum nitrate nonahydrate (Al (NO3)3∙9H2O, 98%, Analar) as a dopant, dissolved in deionized (DI) water. The resistivity is 7626.72 Ωcm and the conductivity is 1.31 x 10-4 Scm-1. The peak of UV emission of the sample is at 380 nm.

ZnO Nanofibers Doped with Ga, In and Er Fabricated with Electrospinning Technique

2006 ◽  
Vol 957 ◽  
Author(s):  
Aurangzeb Khan ◽  
Wojciech M. Jadwisienczak ◽  
Saima N. Khan ◽  
Martin E. Kordesch
Keyword(s):  
Room Temperature ◽  
Green Emission ◽  
Near Band Edge ◽  
Green Band ◽  
Electrospinning Technique ◽  
Room Temperature Photoluminescence ◽  
Green Emission Band ◽  
Zno Nanofibers ◽  
Doped Zno ◽  
Er Doped

ABSTRACTZnO nanofibers doped with Ga, In and Er metals have been fabricated by electrospinning technique. The diameter of the fibers was in the range of 0.5-2 μm and the length can be up to several feet. After spinning fabrication step the samples were dried out and annealed at 900 °C in air. Room temperature photoluminescence (PL) spectra measured for undoped and In- and Ga-doped ZnO fiber samples exhibit only a strong near band edge (NBE) emission at ∼380 nm with very weak green band at 525 nm. In contrary, the PL spectrum of Er-doped ZnO fibers shows a very weak NBE and strong green emission band at ∼550 nm at 300 K. The electrospinning mechanism used for the fabrication of nanofibers was found to be productive, simple and easy to implement disregarding of the doping type and concentration.

scholarly journals Influence of Codoping on the Optical Properties of ZnO Thin Films Synthesized on Glass Substrate by Chemical Bath Deposition Method

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
G. Shanmuganathan ◽  
I. B. Shameem Banu
Keyword(s):  
Thin Films ◽  
Chemical Bath Deposition ◽  
Hexagonal Structure ◽  
Chemical Bath Deposition Method ◽  
Zno Thin Films ◽  
Deposition Method ◽  
Hexagonal Wurtzite Crystal Structure ◽  
Uv Emission ◽  
Doped Zno ◽  
Gradual Variation

Fe and K simultaneously doped ZnO thin films Zn0.99K0.01(Fe)xO (x=1, 2, 3, and 4%) were synthesized by chemical bath deposition method. The XRD investigation reveals that all the doped ZnO thin films are in hexagonal wurtzite crystal structure without impurity phases. With increase in Fe concentration, the growth of thin films alongcaxis is evident from the XRD which indicates the increase in intensity along (002) direction. The same is visible from the surface morphology which shows the formation of hexagonal structure for higher Fe concentration. The topography shows gradual variation with Fe incorporation. The optical energy band gap obtained from the transmittance spectrum decreases from 3.42 to 3.06 eV with increase in Fe concentration indicating the red shift and this trend is consistent with the earlier experimental results. The UV emission is centered around 3.59 eV. The optical constants such as refractive index, extinction coefficient, and absorption coefficient which are essential for the optoelectronic applications were also determined.

The Growth and Optical Properties of Al-Doped ZnO Nanofibers Using PVP Nanofibers as Templates by Atom Layer Deposition

2014 ◽  
Vol 924 ◽  
pp. 23-28
Author(s):  
Dan Fang ◽  
Xuan Fang ◽  
Hai Feng Zhao ◽  
Shuang Li ◽  
Zhi Peng Wei ◽  
...  
Keyword(s):  
Optical Properties ◽  
Doping Concentration ◽  
Stress Generation ◽  
X Ray Diffraction ◽  
Al Doping ◽  
Uv Emission ◽  
Layer Deposition ◽  
Zno Nanofibers ◽  
Doped Zno ◽  
Atom Layer

Different doping concentration Al-doped ZnO nanofibers were synthesized by Atom Layer Deposition (ALD) using PVP fibers as template. The influence of Al doping concentration on the structure and optical properties of nanofibers was investigated. The samples were characterized by means of X-ray diffraction spectra, field emission scanning electron microscopy (FESEM). After doping, the morphologies were not changed, only the diameters of Al-doped ZnO nanofibers became larger. Compared with undoped ZnO, the intensity of diffractive peaks of Al-doped ZnO nanofibers became weak with the increasing of the doping concentration due to stress generation in the crystallization process. In raman spectra, Al2O3peak related peaks were also observed. In addition, the intensity of UV emission decreased with increasing Al doping concentration and had a red shift.

Structural and Field Electron Emission Properties of Pure and Al-Doped ZnO Nanorods Prepared by Sol-Gel Method

2016 ◽  
Vol 1133 ◽  
pp. 515-519
Author(s):  
Hartini Ahmad Rafaie ◽  
Roslan Md Nor ◽  
Yusoff Mohd Amin
Keyword(s):  
Electron Emission ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Field Electron Emission ◽  
Al Doping ◽  
Gel Method ◽  
Sol Gel Method ◽  
Emission Properties ◽  
Field Electron ◽  
Doped Zno

The structural and field electeron emission properties of pure and Al doped ZnO nanorods synthesized on the Al substrates using sol-gel method has been studied. Al doping at different levels was achieved by adding Al2NO3 at 1, 3 and 5 Al at. % with respect to Zn in the synthesis solution. X-ray analysis shows that all the obtained ZnO nanorods can be indexed to the hexagonal ZnO wurtzite structure. Field electron emission measurement using the nanorods as cathode gave a trend of decreasing turn-on field values with increasing Al-doping levels, with values of 7.2 V/μm, 6.6 V/μm, 6.0 V/μm and 5.8V/μm for pure ZnO nanorods, 1, 3 and 5 at% Al-doped ZnO nanorods, respectively. The F-N plot has a linear relationship and the field enhancement factor for all samples has been obtained.

scholarly journals Structural Properties, Conductivity, Dielectric Studiesand Modulus Formulation of Ni Modified ZnO Nanoparticles

2015 ◽  
Vol 2 (1) ◽  
pp. 15-31
Author(s):  
Sarita Sharma ◽  
Kirti Nanda ◽  
R. S. Kundu ◽  
R. Punia ◽  
N. Kishore
Keyword(s):  
Zno Nanoparticles ◽  
Ac Conductivity ◽  
Small Polaron ◽  
Sol Gel ◽  
Phase Segregation ◽  
Average Crystallite Size ◽  
Hexagonal Structure ◽  
Relaxation Dynamics ◽  
Increase With Increase ◽  
Doped Zno

In the present manuscript, we have reported the structural, ac conductivity, dielectric studies and modulus formulation of Zn$_{1-x}$Ni$_x$O $(x=0.00,0.10,0.20,0.30)$ nanoparticles synthesized by sol-gel technique. The Rietveld refinement of X-ray powder diffraction data reveals that the samples possess hexagonal structure (space group - P63mc) of ZnO. The low intensity diffraction peaks corresponding to NiO comes into existence, it is suggested that phase segregation has occurred in the Ni doped ZnO nanoparticles. Average crystallite size has been estimated from XRD patterns, which is found to increase with increase in Ni content. AC conductivity and dielectric properties of Ni doped ZnO nanoparticles have been studied as a function of frequency (100 Hz to 10 MHz) of the applied ac signal in the temperature range of 323K to 463 K. The results showed that ac conductivity increases while other parameters such as the real dielectric constant $\varepsilon'$ and dielectric loss $\tan\delta$ decreases with frequency of applied field. The values of parameters $\varepsilon'$, $\tan\delta$ and ac conductivity are found to increase with increase temperature. In all the samples small polaron conduction mechanism is predominant. The variation of $\varepsilon'$, $\tan\delta$ and ac conductivity is observed to increase with increase in Ni dopant concentration in ZnO. The results of electrical modulus to study the relaxation dynamics of charge carriers indicate the presence of non-Debye type of relaxation in present samples.

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