scholarly journals Hydrothermally growth of TiO2 Nanorods, characterization and annealing temperature effect

2021 ◽  
Vol 48 (3) ◽  
Author(s):  
Nada Falih M ◽  
◽  
Saleem Azara Hussain ◽  
Shawki Khalaf Muhammad ◽  
Adel H. Omran Alkhayatt ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Surface Topography ◽  
Hydrothermal Method ◽  
Annealing Temperature ◽  
Tio2 Nanorods ◽  
Energy Band Gap ◽  
Conductive Glass ◽  
Photocatalytic Applications ◽  
Morphology Changes

Titanium dioxide TiO2 nanorods were successfully grown on conductive glass FTO substrate using the hydrothermal method at a temperature of 160 oC. Surface topography, structure, and optical characteristics were studied according to the influence of annealing temperature (450, 550, and 650) oC. The surface topography results reveal that the TiO2 had nanorods structure with a tetragonal shape, and the rod diameter increases from 84.2 nm to 116.6 nm with increasing the annealing temperature. The crystal structure of the grown TiO2 NRs exhibits a high crystallinity of polycrystalline nature with anatase and rutile phases. The preferential orientation was along (204) plane for anatase tetragonal structure. AFM image shows an intense edge, uniform surface morphology, and increased grain diameter with annealing temperature. The optical properties of TiO2 NRs were investigated, and the absorption edge shows a blue shifting as the annealing temperature increases when considering the crystallinity and morphology changes. The energy band gap was found to be lower than 3 eV, which can be attributed to the presence of anatase and rutile phases with an increment range from 2.72 to 2.86 nm alongside the increase in the annealing temperature. The results indicate that the adopted hydrothermal method and the synthesized TiO2 NRs were suitable for photovoltaic and photocatalytic applications.

Low-Temperature Processing Using Triple Alkoxide Precursors for Layer-Structured Perovskite Thin Films: Preparation and Characterization of Mbi2Ta2O9 (M: Ca or Ba) Thin Films

1999 ◽  
Vol 596 ◽  
Author(s):  
K. Kato
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Electrical Properties ◽  
Low Temperature ◽  
Surface Topography ◽  
Annealing Temperature ◽  
Low Temperature Processing ◽  
Deposited Films ◽  
Alkoxide Precursors

AbstractCaBi2Ta2O9 and BaBi2Ta2O9 thin films were successfully prepared by using triple alkoxide precursors such as Ca[BiTa(OC2H5)9]2 and Ba[BiTa(OC2H5)9]2, respectively. As-deposited films were amorphous and crystallized below 500°C by rapid thermal annealing in oxygen. The crystallinity improved with annealing temperature. The development of the crystal structure and surface topography of the thin films were investigated. Additionally, some electrical properties were evaluated.

Preparation and Optical Properties of TiO2 Film with a Nest-Like Structure by Three Times of Circulating Hydrothermal Method

NANO ◽  
2016 ◽  
Vol 11 (06) ◽  
pp. 1650066 ◽  
Author(s):  
Quangui He ◽  
Jia Zhuang ◽  
Qiuxiang Wen ◽  
Yang Deng ◽  
Jun Yu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Hydrothermal Method ◽  
Three Dimensional ◽  
Dye Adsorption ◽  
Photoelectric Conversion Efficiency ◽  
Photoelectric Conversion ◽  
Facile Hydrothermal Method ◽  
Conductive Glass ◽  
Photoelectric Properties ◽  
Adsorption Amount

An anatase TiO2 photoanode with a novel three-dimensional nest-like structure was prepared directly on a transparent conductive glass substrate through hydrothermal cycles by three times. First, an unidirectional banded structure film was prepared by a facile hydrothermal method. And then, with the time of hydrothermal cycle increased, part of nanobelts were ruptured into a lot of small polyhedrons, but they still maintained a trend of the previous connection, and some fine nanobelts were interweaved in small polyhedrons. Finally, we successfully prepared a film with a novel 3D nest-like structure, and it had all the characteristics of the hierarchitectures. It had better photoelectric properties than the film with fewer times of hydrothermal cycle. Its photoelectric conversion efficiency reached 3.81%, which is due to a large dye adsorption amount, rapid electronic transmission, and superior light scattering and more electrons transmission paths.

scholarly journals Copper-Iron Oxide: A Highly Effective Photocatalyst Than TiO2 Prepared by One-Step Sparking Process

2021 ◽  
Author(s):  
Arisara Panthawan ◽  
Nidchamon Jumrus ◽  
Panupong Sanmuangmoon ◽  
Winai Thongpan ◽  
Tewasin Kumpika ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Iron Oxide ◽  
Annealing Temperature ◽  
Quartz Substrate ◽  
Composite Films ◽  
Energy Band Gap ◽  
Optimum Ratio ◽  
Different Temperatures ◽  
One Step ◽  
Photocatalytic Applications

Abstract Copper-iron (Cu-Fe) oxide composite films were successfully deposited on quartz substrate by a facile sparking process. The nanoparticles were deposited on the substrate after sparking off the Fe and Cu tips with different ratios and were then annealed at different temperatures. The network particles was observed after annealed the film at 700°C. Meanwhile, XRD and SAED patterns of the annealed films at 700°C consisted of a mixed phase of CuO, γ-Fe2O3, CuFe2O4 and CuFe2O. The film with a lowest energy band gap (Eg) of 2.56 eV was observed after anneal at 700°C. Interestingly, the optimum ratio and annealing temperature show highly photocatalytic activity than annealed TiO2 at 500 and 700°C. This is a novel photocatalyst which can be replace TiO2 for photocatalytic applications in the future.

Synthesis, crystal structure and optical properties of a new fluorocarbonate with an interesting sandwich-like structure

2018 ◽  
Vol 47 (18) ◽  
pp. 6464-6469
Author(s):  
Changcheng Tang ◽  
Xingxing Jiang ◽  
Shu Guo ◽  
Mingjun Xia ◽  
Lijuan Liu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Hydrothermal Method

A new fluorocarbonate, Na3Zn2(CO3)3F, was synthesized using a subcritical hydrothermal method.

Crystal structure and optical properties of the Bi-Fe-W-O pyrochlore phase synthesized via a hydrothermal method

2021 ◽  
pp. 161598
Author(s):  
M.S. Lomakin ◽  
O.V. Proskurina ◽  
A.A. Sergeev ◽  
I.V. Buryanenko ◽  
V.G. Semenov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Hydrothermal Method ◽  
Pyrochlore Phase

Crystal structure and optical properties of erbium- and neodymium-doped zirconia nanoparticles

2010 ◽  
Vol 25 (3) ◽  
pp. 500-509 ◽  
Author(s):  
Morgana M. Trexler ◽  
Dajie Zhang ◽  
Lisa Kelly ◽  
Jennifer Sample
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Monoclinic Phase ◽  
Near Infrared ◽  
Annealing Temperature ◽  
Dopant Concentration ◽  
Luminescence Spectra ◽  
Novel Method ◽  
Er Doped ◽  
Zirconia Nanoparticles

We report the synthesis, characterization, and optical properties of high-temperature stable lanthanide-doped luminescent zirconia nanoparticles via a novel method using carbon black as template. Dopant concentrations were varied from 1 to 5% of Er3+ or Nd3+ and annealing temperatures were varied from 650 to 1100 °C. The effects of the dopant concentration on crystal structure and emission properties were evaluated using x-ray powder diffraction and fluorescence spectroscopy, respectively. The lanthanide cations were found to stabilize the tetragonal phase of zirconia over the monoclinic phase as dopant concentration was increased to 5%. Increasing the annealing temperature to 1100 °C had the opposite effect and was found to stabilize the monoclinic phase of zirconia. The luminescence intensity of the Nd-doped zirconia was enhanced by two orders of magnitude over the undoped or Er-doped zirconia. In all cases, the luminescence spectra revealed increasing intensity with increasing annealing temperature. Zirconia luminescence at near-infrared wavelengths is likely caused by oxygen vacancies. This work demonstrates that the spectral signatures of fluorescent zirconia nanoparticles can be modified with small lanthanide dopant concentration. These particles will have utility in fluorescent sensors and tags, as well as new in refractory materials.

scholarly journals Crystal Structure, Surface Topography, Surface Morphology and Optical Properties of DC Magnetron Sputtered VO2 Thin Films using VO2 Target

2018 ◽  
Vol 409 ◽  
pp. 012025
Author(s):  
Noormariah Muslim ◽  
Muhammad Nur Syafi’ie Md Idris ◽  
Ying Woan Soon ◽  
Yuan-Fong Chou Chau ◽  
Chee Ming Lim ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties ◽  
Surface Morphology ◽  
Surface Topography ◽  
Structure Surface ◽  
Vo2 Thin Films

A Novel Phosphors of Cu+ Doped PbBrOH: Prepare, Luminescent Mechanism and Outstanding Properties

2021 ◽  
Author(s):  
Guiyuan Liu ◽  
Hong Zhou ◽  
Quande Che ◽  
Bin Liu ◽  
Jinkai Li ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Hydrothermal Method ◽  
Red Phosphors ◽  
Luminescent Mechanism ◽  
First Time

In this work, Cu+ doped PbBrOH red phosphors (PbBrOH: Cu) was successfully synthesized by hydrothermal method for the first time. The crystal structure, microstructure, optical properties, luminescence mechanism and environmental...

Effect of Annealing Temperature on Structural and Optical Properties of ZnTiO 3 Perovskite Layers Deposited on Silicon for Photocatalytic Applications

2021 ◽  
Vol 6 (35) ◽  
pp. 9382-9388
Author(s):  
Khadija Hammedi ◽  
Marwa Dkhili ◽  
Marouan Khalifa ◽  
Consuelo Alvarez‐Galvan ◽  
Rachid Ouertani ◽  
...  
Keyword(s):  
Optical Properties ◽  
Annealing Temperature ◽  
Structural And Optical Properties ◽  
Photocatalytic Applications

scholarly journals The effect of heat treatment on the optical properties of organic semiconductor (NiPc/C60) thin films

2019 ◽  
Vol 16 (39) ◽  
pp. 33-41
Author(s):  
Atheer M. Mkhaiber
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties ◽  
Optical Absorption ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Optical Absorption Spectra ◽  
Optical Energy Gap ◽  
Optical Energy ◽  
Glass Substrates

Thin films of the blended solution of (NiPc/C60) on glass substrates were prepared by spin-coated method for three different ratios (100/1, 100/10 and 100/100). The effects of annealing temperature and C60 concentration on the optical properties of the samples were studied using the UV-Vis absorption spectroscopy and FTIR spectra. The optical absorption spectrum consists of two main bands, Q and B band, with maxima at about (602-632) nm and (700-730) nm for Q1 and Q2 respectively, and (340-375) nm for B band. The optical energy gap were determined from optical absorption spectra, The variation of optical energy gap with annealing temperature was nonsystematic and this may be due to the improvement in crystal structure for thin films. While the energy gap decreased by increasing the concentration of C60 approaches from the energy gap of this compound.

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