Effect of Mn Doping on the Photocatalytic Photodegradation Properties of Zn1−xMnxO Nanomaterials

2010 ◽  
Vol 44-47 ◽  
pp. 2234-2238
Author(s):  
Chuan Ling Men ◽  
Hong Qin Li ◽  
Hua Zhang
Keyword(s):  
Thin Films ◽  
Methyl Orange ◽  
Spin Coating ◽  
Sol Gel ◽  
High Temperature Annealing ◽  
Mn Doping ◽  
Photodegradation Efficiency ◽  
Decolorization Efficiency ◽  
Vis Spectroscopy ◽  
Uv Visible

We study the effect of Mn doping on the photocatalytic photodegradation properties of Zn1−xMnxO nanomaterials to the methyl orange. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. UV-visible (UV-Vis) spectroscopy was used to examine the radiated and non-radiated samples to study their photocatalytic photodegradation property of the methyl orange. Our results showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels, and there exists an optimum Mn doping (x~0.18) at which photodegradation efficiency is nearly optimized.

Structural, Optical and Photocatalytic Photodegradation Properties of Zn1−xMnxO Prepared by the Sol-Gel Process

2011 ◽  
Vol 239-242 ◽  
pp. 2962-2967 ◽  
Author(s):  
Chuan Ling Men ◽  
Hong Qin Li ◽  
Hua Zhang
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Mn Doping ◽  
X Ray ◽  
Decolorization Efficiency ◽  
Vis Spectroscopy ◽  
Sol Gel Process ◽  
Uv Visible ◽  
Mn Doped

Effect of Mn doping on the structural, photoluminescence and photocatalytic photodegradation properties of Zn1−xMnxO have been studied. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. The samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), photoluminescence and UV-visible (UV-Vis) spectroscopy. XRD analysis showed that Zn1−xMnxO can keep a single phase of wurtzite structure at low Mn doping. UV-Vis spectra of Mn-doped samples showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels.

Electrical Properties of Nanostructured Titanium Dioxide Thin Films Prepared by Sol-Gel Spin-Coating Method

2011 ◽  
Vol 312-315 ◽  
pp. 1027-1031
Author(s):  
Mohd Noor Asiah ◽  
Mat Zain Basri ◽  
Mohamad Rusop
Keyword(s):  
Thin Films ◽  
Titanium Dioxide ◽  
Electrical Properties ◽  
Spin Coating ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Nanostructured Titanium ◽  
Annealing Temperatures ◽  
Vis Spectroscopy

This paper investigated the electrical properties of nanostructured Titanium Dioxide (TiO2) thin films prepared by the sol-gel method at different annealing temperatures. The precursor used was Titanium (IV) butoxide at concentration of 0.4 M. The TiO2 thin films were deposited on the glass and silicon substrates by using the spin coating technique. The influence of annealing temperatures on the electrical, structural, surface morphology and optical properties of the films were characterized by I-V measurement, X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and UV-Vis Spectroscopy, respectively. It was found that the electrical properties of TiO2¬ thin films were changed due to the changes of annealing temperatures. As the annealing temperatures rises, the resistivity of the film found to be decreased. The result also shows that films which does not applied annealing temperature called as deposited were found to be amorphous while the films with annealing temperature T = 350oC and above became crystalline structure. The anatase phase can be obtained at annealing temperatures from T = 350oC up to T = 500oC.

Morphological and Optical Properties of Different Mg Percentage of ZnO/Mg Thin Films Prepared by Sol-Gel Spin-Coating and Immersion Method

2015 ◽  
Vol 1107 ◽  
pp. 637-642 ◽  
Author(s):  
Aadila Aziz ◽  
R. Mohamed ◽  
A.N. Afaah ◽  
N.A.M. Asib ◽  
M. Rusop ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Band Gap ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Sol Gel ◽  
Immersion Method ◽  
Weight Percentage ◽  
Tauc Plot ◽  
Vis Spectroscopy

We have successfully demonstrated ZnO/Mg thin films on Mg seeded-template by using sol-gel spin-coating and immersion technique. By increasing weight percentage of Mg, zinc particles become agglomerate and displayed flower formed as displayed in FESEM characterization. It was observed that the morphology of the zinc particles on Mg seeded-template change from inconsistently distribution for 1 and 3 % into cluster flower-like of zinc particles for 5 and 7 % weight percentage of Mg. The optical properties of the ZnO/Mg thin films were examined by UV-Vis spectroscopy and the Tauc plot methods was used to estimate the optical band gap. The study reveals that, 7 % weight percentage of Mg was recorded as the highest transmittance which is more than 60 % in visible wavelength compared to others. With the rise weight percentage of Mg, the transmittance of the thin films was increased except for 5 %. This gradually downgraded to below 60 % of transmission most probably due to the grain size that becomes bigger. The optical band gap can be tuned by using different Mg percentage to the ZnO/Mg thin films.

scholarly journals Effect of Mn doping on electroforming and threshold voltages of bipolar resistive switching in Al/Mn : NiO/ITO

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 29499-29504 ◽  
Author(s):  
Ni-Na Ge ◽  
Chuan-Hui Gong ◽  
Xin-Cai Yuan ◽  
Hui-Zhong Zeng ◽  
Xian-Hua Wei
Keyword(s):  
Thin Films ◽  
Resistive Switching ◽  
Spin Coating ◽  
Sol Gel ◽  
Bipolar Resistive Switching ◽  
Mn Doping ◽  
Threshold Voltages ◽  
Mn Doped

We investigated the bipolar resistive switching (BRS) properties of Mn-doped NiO thin films by sol–gel spin-coating.

A Systematic investigation on structural and optical properties of sol-Gel spin coating fabricate CdS Nanocrystalline thin films: Effect of Ni doping

2021 ◽  
Author(s):  
BRIJLATA SHARMA ◽  
Rajesh Lalwani ◽  
Ruby Das ◽  
Devi Singh Raghuwanshi
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Spin Coating ◽  
Sol Gel ◽  
Band Edge ◽  
Photoluminescence Spectra ◽  
Cds Thin Film ◽  
Vis Spectroscopy ◽  
Deposited Films ◽  
Nanocrystalline Thin Films

Abstract In the present work, we have successfully fabricated undoped and Ni-doped Nanocrystalline CdS thin film on an ultrasonically cleaned glass substrate employing the Sol-Gel spin coating technique. The structural and spectroscopic properties of the films were investigated using XRD spectra, UV-Vis spectroscopy and photoluminescence spectra respectively. The X-Ray diffraction spectra revealed the polycrystalline nature of films with cubic structure and (111) as preferred orientation. The average particle size evaluated by the Debye-Scherrer formula lying in the range 6.65nm to 12.05 nm for the deposited films. According to UV-VIS Spectroscopy, the average transmittance of films in the visible region varies between 70–90%. The optical band gap of CdS thin film was evaluated from absorption spectra. The bandgap of the deposited films is in the range of 2.48 eV to 2.70 eV which is higher than that of bulk CdS (2.42eV). This verifies the blue shifting in band edge of CdS Nanocrystalline thin films due to the quantum confinement effect. Photoluminescence spectra of the thin film showed that the fundamental band edge emission peak centred at 485nm also called blue band emission.

Structural and optical properties of ZnO thin film prepared by sol-gel spin coating

2020 ◽  
Vol 38 (1) ◽  
pp. 17-22
Author(s):  
G Balakrishnan ◽  
Vivek Sinha ◽  
Yogesh Palai Peethala ◽  
Manoj Kumar ◽  
R.J. Golden Renjith Nimal ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Hexagonal Structure ◽  
Zno Thin Films ◽  
Zno Films ◽  
Structural And Optical Properties ◽  
Vis Spectroscopy

AbstractZinc oxide (ZnO) thin films were deposited on Si (1 0 0) and glass substrates by sol-gel spin coating technique. Zinc acetate dihydrate, monoethanolamine and isopropanol were used as the sources for precursor solution and the resulting gel was used for the preparation of ZnO thin films. The films were annealed at different temperatures (100 °C to 500 °C) and the effect of annealing on the structural and optical properties was investigated. X-ray diffraction (XRD) and UV-Vis spectroscopy were used for the analysis of the films. The XRD results indicated the polycrystalline hexagonal structure of the ZnO films with (0 0 2) orientation. The optical properties of the films were studied using UV-Vis spectrophotometer in the wavelength range of 190 – 1100 nm. The optical characterization of the ZnO thin films showed the high transmittance of ~90 % for the films annealed at 400 °C. The films showed the absorbance ~360 – 390 nm and bandgap values of 3.40 – 3.10 eV, depending on the annealing temperature of the films.

STRUCTURAL, OPTICAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF NANOCRYSTALLINE TiO2 THIN FILMS DEPOSITED BY SOL-GEL SPIN COATING

2019 ◽  
Vol 7 (1) ◽  
pp. 28
Author(s):  
KOMARAIAH DURGAM ◽  
RADHA EPPA ◽  
REDDY M. V. RAMANA ◽  
KUMAR J. SIVA ◽  
R. SAYANNA ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Photocatalytic Activity ◽  
Spin Coating ◽  
Sol Gel ◽  
Tio2 Thin Films ◽  
Nanocrystalline Tio2

Sol-gel growth of Ni doped CdS on glass substrates: effect of spin coating speed and dopant concentration

2020 ◽  
Vol 10 ◽  
Author(s):  
Atefeh Nazari Setayesh ◽  
Hassan Sedghi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Optical Band Gap ◽  
Dopant Concentration ◽  
Rotation Speed ◽  
Sol Gel ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Glass Substrates

Background: In this work, CdS thin films were synthesized by sol-gel method (spin coating technique) on glass substrates to investigate the optical behavior of the film. Methods: Different substrate spin coating speeds of 2400, 3000, 3600 rpm and different Ni dopant concentrations of 0 wt.%, 2.5 wt.%, 5 wt.%) were investigated. The optical properties of thin films such as refraction index, extinction coefficient, dielectric constant and optical band gap energy of the layers were discussed using spectroscopic ellipsometry method in the wavelength range of 300 to 900 nm. Results: It can be deduced that substrate rotation speed and dopant concentration has influenced the optical properties of thin films. By decreasing rotation speed of the substrate which results in films with more thicknesses, more optical interferences were appeared in the results. Conclusion: The samples doped with Ni comparing to pure ones have had more optical band gap energy.

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