Visible spectrum of titanium dioxide

2010 ◽  
Vol 12 (45) ◽  
pp. 15018 ◽  
Author(s):  
Xiujuan Zhuang ◽  
Anh Le ◽  
Timothy C. Steimle ◽  
Ramya Nagarajan ◽  
Varun Gupta ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Spectrum

Synthesis of Cu Loaded TiO2 Nanoparticles for the Improved Photocatalytic Degradation of Rhodamine B

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660002 ◽  
Author(s):  
V. Kavitha ◽  
P. S. Ramesh ◽  
D. Geetha
Keyword(s):  
Titanium Dioxide ◽  
Rhodamine B ◽  
Sol Gel ◽  
Average Particle Size ◽  
Visible Spectrum ◽  
Xrd Analysis ◽  
Bandgap Energy ◽  
Average Particle ◽  
Titanium Tetraisopropoxide ◽  
Photoexcited Electron

Copper doped Titanium dioxide TiO2 nanoparticles were synthesized by sol–gel method using titanium tetraisopropoxide and copper sulfate as precursors. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), UV-Visible spectroscopy (UV-Vis), Photoluminesce spectroscopy (PL) and atomic force microscopy (AFM). XRD analysis confirms the formation of anatase titanium dioxide and average particle size was 35[Formula: see text]nm. Cu– TiO2 exhibits a shift in the absorption edge toward visible spectrum. The rate of recombination and transfer behavior of the photoexcited electron–hole pairs in the semiconductors was recorded by photoluminescence. From SEM spherical shaped nanoparticles was observed. Comparing with pure TiO2 nanoparticles, Cu doped TiO2 photocatalyst exhibited enhanced photocatalytic activity under natural sunlight irradiation in the decomposition of rhodamine B aqueous solution. The maximum 97% of degradation efficiency of Rhodamine B was observed at 0.6% Cu–TiO2 within 180[Formula: see text]min. The photocatalytic efficiency of Rhodamine B of Cu doped TiO2 nanoparticle was higher than the pure TiO2, which could be attributed to the small crystallinity intense light absorption in Sunlight and narrow bandgap energy of Copper.

scholarly journals Black Titanium Dioxide Nanomaterials in Photocatalysis

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Xiaodong Yan ◽  
Yong Li ◽  
Ting Xia
Keyword(s):  
Titanium Dioxide ◽  
Visible Spectrum ◽  
Photocatalytic Efficiency ◽  
Structure Property ◽  
Preparation Methods ◽  
Practical Applications ◽  
Optical And Electronic Properties ◽  
Amorphous Surface ◽  
Structure Engineering ◽  
Black Color

Titanium dioxide (TiO2) nanomaterials are widely considered to be state-of-the-art photocatalysts for environmental protection and energy conversion. However, the low photocatalytic efficiency caused by large bandgap and rapid recombination of photo-excited electrons and holes is a challenging issue that needs to be settled for their practical applications. Structure engineering has been demonstrated to be a highly promising approach to engineer the optical and electronic properties of the existing materials or even endow them with unexpected properties. Surface structure engineering has witnessed the breakthrough in increasing the photocatalytic efficiency of TiO2 nanomaterials by creating a defect-rich or amorphous surface layer with black color and extension of optical absorption to the whole visible spectrum, along with markedly enhanced photocatalytic activities. In this review, the recent progress in the development of black TiO2 nanomaterials is reviewed to gain a better understanding of the structure-property relationship with the consideration of preparation methods and to project new insights into the future development of black TiO2 nanomaterials in photocatalytic applications.

scholarly journals Observation of crystalline changes of titanium dioxide during lithium insertion by visible spectrum analysis

2017 ◽  
Vol 19 (20) ◽  
pp. 13140-13146 ◽  
Author(s):  
Inho Nam ◽  
Jongseok Park ◽  
Soomin Park ◽  
Seongjun Bae ◽  
Young Geun Yoo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Spectrum Analysis ◽  
Anode Materials ◽  
Visible Spectrum ◽  
Insertion Reaction ◽  
Lithium Insertion ◽  
Structural Colour

A novel analysing method based on structural colour was developed to show the changes in the crystalline and nanostructure of anode materials, such as a TiO2, during the Li insertion reaction.

scholarly journals STUDY OF MECHANISMS OF LIGHT ABSORPTION IN TITANIUM DIOXIDE FILMS

2016 ◽  
Vol 11 (4) ◽  
pp. 50-55
Author(s):  
V. V. Novopashin ◽  
L. A. Skvortsov ◽  
M. I. Skvortsova
Keyword(s):  
Titanium Dioxide ◽  
Near Infrared ◽  
Stoichiometric Composition ◽  
Ionic Current ◽  
Visible Spectrum ◽  
Infrared Range ◽  
Current Increase ◽  
Titanium Dioxide Films ◽  
532 Nm ◽  
Near Infrared Range

This work is devoted to comparison of optical absorption value of titanium dioxide coatings obtained by means of reactive thermal evaporation (RTE) and its activated species (ARTE), as well as to study on the dependence of the absorption coefficient of the coatings on the process parameters. Special attention is paid to the study of the influence of the films nonstoichiometry on absorption in the visible and near-infrared ranges of the spectrum. The results allow concluding that the dominant mechanism responsible for absorption in titanium dioxide films in the near-infrared range of the spectrum is the deviation from the stoichiometric composition. This deviation is caused by the presence of defects in the coating structure such as oxygen vacancies (ions Ti3+), which are seen as electron traps. As oxygen pressure and ionic current increase, the absorption of titanium dioxide films is reduced, and films with a composition closer to stoichiometric are obtained. In turn, the absorption of titanium dioxide in the visible spectrum (at wavelengths of 532 nm and 670 nm) has less to do with defects in stoichiometry, in contrast to contaminating impurities contained in the starting material, in the vacuum chamber and in the jet gas.

scholarly journals p-n Based Photoelectrochemical Device for Water Splitting Application Alpha-Hematite (α-Fe2O3)-Titanium Dioxide (tio2) as N-Electrode & Polyhexylthiophene (rrphth) - Nanodiamond (ND) as P-Electrode

MRS Advances ◽  
2018 ◽  
Vol 3 (13) ◽  
pp. 697-706
Author(s):  
Hussein Alrobei ◽  
Hye Young Lee ◽  
Ashok Kumar ◽  
Manoj K. Ram
Keyword(s):  
Titanium Dioxide ◽  
Water Splitting ◽  
Uv Light ◽  
Visible Region ◽  
Visible Spectrum ◽  
Clean Energy ◽  
Weight Percentage ◽  
Production Of Hydrogen ◽  
Electron Hole Pair ◽  
Physical And Chemical

ABSTRACTRecently, photoelectrochemical (PEC) water splitting using semiconductor photoanode has received great attention due production of hydrogen through clean energy. The alpha hematite (α Fe2O3) is one of the candidate amongst photoanodic materials, which is chemically stable, abundant in nature with a band gap of 2.0-2. 2eV allowing to be harvesting in the visible light. However, it has also drawn back due to high recombination rate of electron–hole pair revealing the low concentration of charges and lower device performance. In common with α-Fe2O3, the titanium dioxide (TiO2) has been known as one of the most explored photoanode electrode material due to its physical and chemical stability in aqueous and non-toxicity. However, TiO2 has large bandgap (3.0-3.2 eV) that results in absorbing UV light and very small part of visible region. Incorporation of TiO2 in α-Fe2O3 could achieve better efficiencies as photoanode materials by enhancing the electric conductivity, limited hole diffusion length, and both materials can absorb light in both UV and visible spectrum range. However, the photoanodic properties of α-Fe2O3 with different concentrations of TiO2 are mostly unknown. Under this work, α-Fe2O3-TiO2 nanomaterial was synthesized using a hydrothermal method. The α-Fe2O3-TiO2 nanomaterials containing different weight percentage (2.5, 5, 16, 25, and 50) of TiO2 to α-Fe2O3 were characterized using SEM, XRD, UV-Vis, FTIR and Raman techniques, respectively. The electrochemical properties of α-Fe2O3-TiO2 nanomaterials were investigated by cyclic voltammetry and chronoamperometry techniques, respectively.

Photoelectrocatalytic activity of In(iii)-modified TiO2 photoanodes in the visible spectrum region

2020 ◽  
Vol 44 (37) ◽  
pp. 16200-16210
Author(s):  
V. A. Grinberg ◽  
V. V. Emets ◽  
D. A. Maslov ◽  
M. V. Tsodikov ◽  
N. A. Mayorova ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Sol Gel ◽  
Visible Spectrum ◽  
Nanocrystalline Film ◽  
Gel Method ◽  
Sol Gel Method ◽  
Spectrum Region

Nanocrystalline film photoanodes of titanium dioxide modified with In(iii) ions in the concentration range from 1.0 to 10 mass% (0.23 to 2.52 at%) are manufactured using the sol–gel method.

scholarly journals INVESTIGATION OF INCREASING THE PHOTOCATALYTIC ACTIVITY OF TITANIUM DIOXIDE DUE TO THE USE OF TUNGSTEN (VI) OXIDE

2021 ◽  
pp. 67-78
Author(s):  
A. S. Bakhtin ◽  
N. V. Lyubomirskiy ◽  
T. A. Bakhtina ◽  
V. V. Nikolaenko ◽  
V. M. Gavrish
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Tungsten Trioxide ◽  
Thiobacillus Ferrooxidans ◽  
Organic Pollutant ◽  
Experimental Studies ◽  
Visible Spectrum ◽  
Biological Synthesis ◽  
Vital Activity ◽  
Natural Solar Radiation

The paper presents the results of experimental studies to determine the possibility of increasing the photocatalytic activity of titanium dioxide through the use of tungsten (VI) oxide, by testing the decomposition of rhodamine B as an organic pollutant in aqueous solutions under the influence of UV radiation, including in the visible spectrum. Industrial titanium dioxide of rutile modification and tungsten trioxide obtained by biological synthesis due to the use of the vital activity of thionic bacteria (Thiobacillus ferrooxidans) were used as photocatalysts. It was found that the dye concentration in a solution with a mixture of TiO2 and WO3 in a ratio of 1: 1 under the influence of natural solar radiation decreased by 85% after 28 days of study compared with 30% and 42% for solutions with pure WO3 and TiO2, respectively.

scholarly journals Correction: Observation of crystalline changes of titanium dioxide during lithium insertion by visible spectrum analysis

2017 ◽  
Vol 19 (37) ◽  
pp. 25796-25796
Author(s):  
Inho Nam ◽  
Jongseok Park ◽  
Soomin Park ◽  
Seongjun Bae ◽  
Young Geun Yoo ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Spectrum Analysis ◽  
Visible Spectrum ◽  
Chem Phys ◽  
Lithium Insertion ◽  
Phys Chem Chem Phys

Correction for ‘Observation of crystalline changes of titanium dioxide during lithium insertion by visible spectrum analysis’ by Inho Nam et al., Phys. Chem. Chem. Phys., 2017, 19, 13140–13146.

Studies on the mechanism of printing film-coated tablets containing titanium dioxide in the film by using UV laser irradiation

2009 ◽  
Vol 00 (00) ◽  
pp. 090915102728058-8
Author(s):  
Yoshiteru Kato ◽  
Yasuhiko Nakashima ◽  
Naoki Shino ◽  
Koichi Sasaki ◽  
Akihiro Hosokawa ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Laser Irradiation ◽  
Uv Laser
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