Nanoplate-like tungsten trioxide (hydrate) films prepared by crystal-seed-assisted hydrothermal reaction

Vertically-aligned WO3 nanoplates on transparent conducting fluorine-doped tin oxide (FTO) glass were prepared by a facile template-free crystal-seed-assisted hydrothermal method. The effects of the hydrothermal temperature and reaction time on the crystal structure and morphology of the products were investigated by XRD and SEM. The XRD results showed that the as-prepared thin films obtained below 150[Formula: see text]C comprised orthorhombic WO3 ⋅ H2O and completely converted to monoclinic WO3 at 180[Formula: see text]C. It was also noted that there was a phase transformation from orthorhombic to monoclinic by increasing the reaction time from 1 to 12 h. SEM analysis revealed that WO3 thin films are composed of plate-like nanostructures.

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Fabrication of nanoporous titania on glass and transparent conducting oxide substrates by anodization of titanium films

Journal of Materials Research ◽

10.1557/jmr.2007.0078 ◽

2007 ◽

Vol 22 (3) ◽

pp. 681-687 ◽

Cited By ~ 18

Author(s):

Andrew J. Leenheer ◽

Alexander Miedaner ◽

Calvin J. Curtis ◽

Maikel F.A.M. van Hest ◽

David S. Ginley

Keyword(s):

Thin Films ◽

Organic Photovoltaics ◽

Hydrofluoric Acid ◽

Transparent Conducting Oxide ◽

Trisodium Citrate ◽

Rf Magnetron Sputtering ◽

Potassium Fluoride ◽

Sem Analysis ◽

Nanoporous Structure ◽

Transparent Conducting

Nanoporous titania (TiO2) or titania nanotubes could provide a continuous nanostructured electron-conducting anode for organic photovoltaics. In this work, nanoporous titania was formed by anodizing thin films of titanium on both glass and transparent conducting oxide (TCO) substrates. Titanium thin films (500–700 nm) were deposited by radio frequency (RF) magnetron sputtering. Films were anodized in acidic electrolytes containing small amounts of hydrofluoric acid (HF) at constant voltages ranging from 7 to 15 V. Scanning electron microscope (SEM) analysis revealed a nanoporous structure. Nanoporous titania structures were grown on glass in an electrolyte containing sulfuric acid, trisodium citrate, and potassium fluoride, with pore diameters around 50 nm. Analyzing the films at different anodization times, the stages of nanopore formation were elucidated. Additionally, nanoporous titania was formed on a TCO substrate by anodizing in an electrolyte containing acetic acid and hydrofluoric acid. While not completely transparent, the nanoporous titania is promising for use in organic photovoltaics.

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Influence of Sr-Doping on the Structure of LaCoO3 Thin Films Prepared by Pulsed Laser Deposition

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.231.19 ◽

2015 ◽

Vol 231 ◽

pp. 19-24 ◽

Cited By ~ 3

Author(s):

Agnieszka Kopia ◽

Łukasz Cieniek ◽

Kazimierz Kowalski ◽

Jan Kusiński

Keyword(s):

Thin Film ◽

Thin Films ◽

Pulsed Laser Deposition ◽

Pulsed Laser ◽

Sem Analysis ◽

Laser Deposition ◽

Layer Surface ◽

X Ray Diffraction ◽

X Ray ◽

Structure And Morphology

The aim of the research was to investigate the influence of strontium on the structure thin films La1-x SrxCoO3 (x=0; 0.1, 0.2). The LaCoO3 and LaCoO3 doped by Sr films were grown by pulsed laser deposition (PLD) on Si [100] substrate using an Excimer KrF (= 248 nm). To characterize the structure and morphology of the thin films were used the SEM, AFM and XRD methods. X-Ray Diffraction analysis showed only LaCoO3 phase in the thin film not doped andLa0.1Sr0.9CoO3 and La0.2Sr0.8CoO3 phases in thin films doped by Sr. The crystallites size, calculated by Williamson-Hall plots, was smaller for films doped by Sr. The surface of the thin films was free from the drops. SEM analysis showed change of the shape of thin films as a result of doping by Sr. Highly developed layer surface was observed using the AFM microscope for thin films doped by Sr.

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Properties of Nanostructured Rutile Titanium Dioxide (TiO2) Thin Film Deposited with Silver Sulfide (Ag2S) Quantum Dots as Photoanode for Solar Photovoltaic

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.290.329 ◽

2019 ◽

Vol 290 ◽

pp. 329-335 ◽

Cited By ~ 1

Author(s):

Nurul Syafiqah Mohamed Mustakim ◽

Suhaila Sepeai ◽

Norasikin Ahmad Ludin ◽

Mohd Asri Mat Teridi ◽

Mohd Adib Ibrahim

Keyword(s):

Thin Film ◽

Thin Films ◽

Quantum Dots ◽

Titanium Dioxide ◽

Reaction Time ◽

Electrical Properties ◽

Near Infrared ◽

Hydrothermal Reaction ◽

Hydrothermal Process ◽

Silar Method

Titanium dioxide (TiO2) nanoparticles thin film has been successfully prepared by a simple hydrothermal process using Hydrochloric Acid (HCl) as chelating agent and Titanium (IV) Chloride (TiCl4) as precursor. In this study, the nanostructured TiO2 thin films were prepared at different hydrothermal reaction times of 2 hours, 5 hours, and 10 hours, and then Ag2S Quantum Dots (QDs) were deposited on the surface of TiO2 nanoparticles using 6 cycles of Successive Ionic Layer Adsorption and Reaction Deposition (SILAR) method. The surface morphology, crystalline structure and optical characterizations of the films were carried out using Field Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscope (AFM), X-ray Diffraction (XRD) and Ultra-Violet-Visible Near Infrared Spectrophotometer (UV-Vis). For electrical properties, four-point probe investigated the sheet resistance, resistivity, and conductivity of these thin films. TiO2 nanorods were formed with diameter ranged from 33.78 nm to 42.58 nm and the length of TiO2 layer increased as the reaction time increased, from 2.84 μm to 3.93 μm (without Ag2S QDs) and 2.88 μm to 4.85 μm (with Ag2S QDs). When the reaction time reaches 10 hours, nanoflowers can be seen on the surface of film. The XRD results showed that with longer reaction time, the value of full-width at half maximum (FWHM) of the TiO2/ Ag2S QDs thin films decreased from 0.335° to 0.263 while the crystallite size increased from 22.73 nm to 35.39 nm. UV-Vis analysis indicated that the optical band gap of these thin films decreased from 2.68 eV to 2.00 eV (direct) and 2.94 eV to 2.40 eV (indirect) with increased in reaction time. The electrical properties of the films showed that the resistivity varied between 7 x 107 Ω.cm and 5.07 x 107 Ω.cm when the reaction time changed from 2 hours to 10 hours. The conductivity of the TiO2/ Ag2S QDs thin films increased with the increase in hydrothermal reaction time and further increased with the incorporation of Ag2S QDs. Besides, the TiO2 films synthesized hydrothermally for 10 hours showed higher surface roughness as compared to other thin films. The obtained results showed that the TiO2 / Ag2S QDs thin films are applicable as a photoanode for Quantum Dots Sensitized Solar Cell (QDSSCs) applications.

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Influence of hydrothermal reaction time on phases, morphologies and optical properties of Sm2O3 thin films

Materials Research Innovations ◽

10.1179/143307507x246585 ◽

2007 ◽

Vol 11 (4) ◽

pp. 173-176 ◽

Cited By ~ 3

Author(s):

J.-F. Huang ◽

Y. Huang ◽

L.-Y. Cao ◽

J.-P. Wu

Keyword(s):

Thin Films ◽

Optical Properties ◽

Reaction Time ◽

Hydrothermal Reaction ◽

Hydrothermal Reaction Time

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Synthesis of (La0.95Eu0.05)2O3 Red Phosphors with Hydroxide Nanowires as the Precursor: Template-Free Hydrothermal Processing and Photoluminescent Properties

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.602-603.1021 ◽

2014 ◽

Vol 602-603 ◽

pp. 1021-1027

Author(s):

Xue Jiao Wang ◽

Ji Guang Li ◽

Qi Zhu ◽

Xu Dong Sun

Keyword(s):

Solid Solution ◽

Phase Structure ◽

Hydrothermal Reaction ◽

Particle Morphology ◽

Hydrothermal Processing ◽

Solution Ph ◽

Hydrothermal Temperature ◽

Red Emission ◽

Red Phosphors ◽

Template Free

Ln (OH)3(Ln=La0.95Eu0.05) nanowires have been successfully synthesized through hydrothermal reaction, without using any template, from mixed solutions of the component nitrates. It was shown that neither solution pH (7.5-13) nor hydrothermal temperature (120 and 150 °C) significantly influences the phase structure and particle morphology of the product. The resultant Ln (OH)3nanowires are of uniform dimension and good dispersion. A homogeneous Ln2O3solid solution was yielded by calcining the hydroxide nanowires in the air at 800 oC. Under 285 nm excitation, the Ln2O3phosphor exhibits the characteristic red emission of Eu3+at ~630 nm and show emission behaviors clearly dependent on the calcination temperature, which were investigated in detail.

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Perovskite La1-xSrxFeO3 Thin Films Deposited by Laser Ablation Process

Archives of Metallurgy and Materials ◽

10.1515/amm-2016-0179 ◽

2016 ◽

Vol 61 (2) ◽

pp. 1063-1067 ◽

Cited By ~ 4

Author(s):

A. Cyza ◽

Ł. Cieniek ◽

A. Kopia

Keyword(s):

Thin Films ◽

Sem Analysis ◽

Laser Deposition ◽

X Ray Diffraction ◽

Ablation Process ◽

X Ray ◽

Structure And Morphology ◽

Laser Ablation Process ◽

Developed Surface ◽

The Mean

Abstract The aim of the research was to investigate the influence of strontium on the structure of thin films La1-xSrxFeO3 (x = 0; 0,1; 0,2). The LaFeO3 and Sr-doped LaFeO3 films were produced by pulsed laser deposition (PLD) on Si (100) substrate using the Nd-YAG (λ = 266 nm) laser. SEM, AFM and XRD methods were used to characterize the structure and morphology of the thin films. X-Ray Diffraction analysis showed only the LaFeO3 phase in the undoped thin film and the La0.9Sr0.1O3 and La0.8Sr0.2O3 phases in thin films doped by Sr. The mean crystallite size, calculated by Williamson-Hall method, was smaller (of the order of 18 nm) in films doped by Sr. SEM analysis showed small droplets in thin films doped by Sr. Highly developed surface layer was observed using the AFM microscope for thin films doped by Sr.

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Hollow Urchins MnO2 Nanoparticles for Electrochemical Supercapacitor Electrodes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.347-353.2975 ◽

2011 ◽

Vol 347-353 ◽

pp. 2975-2978

Author(s):

Xiao Hong Li ◽

Fei Hu ◽

Xiang Ping Jiang

Keyword(s):

Cyclic Voltammetry ◽

Reaction Time ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Crystallographic Structure ◽

Hydrothermal Temperature ◽

Structure And Morphology ◽

Electrochemical Supercapacitor ◽

Mno2 Nanoparticles ◽

Structure Morphology

Manganese dioxide (MnO2) nanostructures have been synthesized by hydrothermal method. The crystallographic structure, morphology, and electrochemical properties of MnO2 nanoparticles have been measured by XRD, SEM, TEM, and cyclic voltammetry (CV). It is shown that the hydrothermal temperature and reaction time have played an important role on the crystallographic structure and morphology of the MnO2 particles. And the MnO2 particles composed of hollow urchins exhibits a higher specific capacitance of 210 F/g.

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