Synthesis of luminescent polymers in the UV light region from dimethacrylate monomer using novel quinoline dyes

2019 ◽  
Vol 136 (19) ◽  
pp. 47461
Author(s):  
Rafael Turra Alarcon ◽  
Giovanny Carvalho dos Santos ◽  
Arthur Rossi de Oliveira ◽  
Luiz Carlos da Silva‐Filho ◽  
Gilbert Bannach
Keyword(s):  
Uv Light ◽  
Light Region ◽  
Luminescent Polymers

Synthesis and Characterization of Asparagine-Modified and Terbium-Doped Spherical Hydroxyapatite Nanoparticle

2016 ◽  
Vol 697 ◽  
pp. 62-66
Author(s):  
Xiao Feng Xing ◽  
Liang Liang Luo ◽  
Yu Ping Guo ◽  
Wei Min Gao ◽  
Liang Hu
Keyword(s):  
Uv Light ◽  
Raw Materials ◽  
Calcium Nitrate ◽  
Thermal Method ◽  
Fluorescent Properties ◽  
Transmission Electron ◽  
Light Region ◽  
Structure Morphology ◽  
Fluorescence Spectrometer

The spherical hydroxyapatite nanoparticles (HAP) were synthesized by hydro-thermal method, and calcium nitrate, terbium oxide, diammonium hydrogen phosphate were used as raw materials with the help of surfactant L-Asparagine. Meanwhile, different amount of Tb was added to investigate the effect of different terbium dropping amount on the properties of HAP. The structure, morphology and luminescent of the obtained HAP that was characterized via X-ray powder diffraction (XRD), fluorescence spectrometer (PL) and transmission electron microscope (TEM). Results showed that spherical HAP which in average of 30 nm with good dispersion showed remarkable fluorescent properties and their maximum emission were observed at 543 nm, which could be also excited at uv light region of 377 nm.The optimum mole fraction of Tb was 3%. Therefore terbium-doped spherical HAP of prepared sample would be tracked by flourescence.

Synthesis and Characterization of Plate-Like Cerium Phosphate via Soft Solution Processing

2006 ◽  
Vol 45 ◽  
pp. 668-672 ◽  
Author(s):  
Rui Xing Li ◽  
Shu Yin ◽  
Qing Tang ◽  
Tsugio Sato
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Visible Light Region ◽  
Reaction Products ◽  
Isothermal Temperature ◽  
Cerium Phosphate ◽  
Light Region ◽  
Sulfuric Acid Solutions ◽  
Good Feeling

Because of the low refractive indices, plate-like cerium phosphates (CePs) are expected to be used as one of active ingredients in personal suncare cosmetics. Plate-like Ce2(PO4)2HPO4･H2O particles were synthesized via solvothermal reactions of Ce(NH4)2(NO3)6 or Ce(SO4)2･4H2O in phosphoric acid with or without nitric acid and sulfuric acid solutions. The variation of morphology of Ce2(PO4)2HPO4･H2O particles significantly depended on the variety of cerium salt, isothermal temperature and time, although all reaction products consisted of plate-like particles. This plate-like compound showed excellent UV light absorption and transparency in the visible light region. Consequently, it is suggested that the plate-like Ce2(PO4)2HPO4･H2O particles might be used as suncare products to give an ideal optical effect of both UV-shielding ability and transparency in the visible light region, as well as a good feeling on the skin.

scholarly journals Narrow band resonance in the UV light region of a plasmonic nanotextured surface used as a refractive index sensor

RSC Advances ◽  
2017 ◽  
Vol 7 (57) ◽  
pp. 35957-35961 ◽  
Author(s):  
Jingjing Liu ◽  
Tengfei Wang ◽  
Fuqiang Nie
Keyword(s):  
Refractive Index ◽  
Narrow Band ◽  
Uv Light ◽  
Ultra Violet ◽  
Refractive Index Sensor ◽  
Ultra Violet Light ◽  
Violet Light ◽  
Light Region

An aperiodic plasmoic nanotextured surface with metal-dielectric-metal (MDM) multilayer nanostructure acts as a refractive index (RI) sensor in the ultra-violet light region.

Self-Cleaning TiO2/SiO2 Thin Film Prepared by a Simple Sol-Gel Method

2014 ◽  
Vol 804 ◽  
pp. 157-160
Author(s):  
Wen Xiu Liu ◽  
Jun Na Xu ◽  
Jun Zhang ◽  
Xue Mei Liu ◽  
Wen Bin Cao
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Sulfate Solution ◽  
Ultraviolet Region ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Titanyl Sulfate ◽  
Glass Substrates ◽  
Light Region ◽  
Vis Spectroscopy

TiO2 thin films were prepared on SiO2-coated glass substrates using sols deriving from high concentration titanyl sulfate solution by the spin-coating technique. The calcined films were characterized by X-ray diffraction, UV-Vis spectroscopy, scanning electron microscopy. The film exhibited high transmittance in the visible light region and high absorption in the ultraviolet region. The contact angle of SiO2/TiO2 decreased to below 5° under 30 min of UV light irradiation and can sustain for 1 weeks.

scholarly journals Single vs. two-photon microscopy for label free intrinsic tissue studies in the UV light region

The Analyst ◽  
2014 ◽  
Vol 139 (11) ◽  
pp. 2663-2667 ◽  
Author(s):  
Vitalijs Zubkovs ◽  
Frédéric Jamme ◽  
Slavka Kascakova ◽  
Franck Chiappini ◽  
François Le Naour ◽  
...  
Keyword(s):  
Single Photon ◽  
Uv Light ◽  
Label Free ◽  
Tissue Diagnosis ◽  
Two Photon Microscopy ◽  
Two Photon ◽  
Ultraviolet Microscopy ◽  
Light Region

Single photon ultraviolet microscopy is complementary to two-photon microscopy for tissue diagnosis.

scholarly journals Photocatalytic and Photoelectrochemical Water Splitting on TiO2via Photosensitization

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Saji Thomas Kochuveedu
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Uv Light ◽  
Solar Spectrum ◽  
Wide Bandgap ◽  
Oxidation Potential ◽  
Light Region ◽  
Narrow Bandgap ◽  
Visible Light Active ◽  
Bandgap Semiconductors

The search for an alternative to replace conventional fuel has been going on for years due to the limited storage of fossil fuel and excess CO2emission from the fuel. Using H2as fuel has gained wide attention recently, as well as consequently splitting of water into hydrogen and oxygen. Seminal semiconductors such as TiO2and ZnO have their position of CB and VB in alignment with water reduction and oxidation potential, respectively, but their wide bandgap allows them to absorb only UV light of the solar spectrum. Combining narrow bandgap semiconductors or other visible light active sensitizers with TiO2/ZnO is a facile route to exploit the visible light region of the solar spectrum. In this review, I make an attempt to summarize the various photosensitizers used in combination with TiO2for water splitting with recent reports as examples.

Enhanced Photocatalytic Activity of Cu1.8Se/CuAgSe for Organic Pollutants under Visible and Near-Infrared Light

2018 ◽  
Vol 281 ◽  
pp. 825-829
Author(s):  
Li Na Qiao ◽  
Ming Rui Tang ◽  
Yong Yun Gang ◽  
Hao Min Xu ◽  
Yuan Hua Lin
Keyword(s):  
Photocatalytic Activity ◽  
Room Temperature ◽  
Near Infrared ◽  
Uv Light ◽  
Infrared Light ◽  
Precipitation Method ◽  
Near Infrared Light ◽  
Step Process ◽  
Ion Exchange Reaction ◽  
Light Region

The Cu1.8Se/CuAgSe nanostructure was synthesized by a simple two-step process. Starting with the template of cubic Cu1.8Se nanoplate by precipitation method, Cu1.8Se/CuAgSe nanostructure and ternary CuAgSe were prepared through a rapid ion exchange reaction using various amount of AgNO3 at room temperature. The as-prepared samples were analyzed by XRD, SEM and DRS. It was found that Cu1.8Se/CuAgSe heterostructure and the pure CuAgSe phase were formed without changing the morphology, and these samples had efficient light absorption from UV light to near-infrared light region. Photocatalytic properties of these samples were evaluated by the degradation of Congo red under visible and near-infrared light. The Cu1.8Se/CuAgSe nanostructure showed enhanced photocatalytic activity due to the lower recombination of charge-carrier in the photodegradation process.

EFFECTS OF Eu-DOPING SITE ON STRUCTURAL AND PHOTOLUMINESCENT PROPERTIES OF CaTiO3 PARTICLES

2011 ◽  
Vol 01 (02) ◽  
pp. 215-221 ◽  
Author(s):  
GUANPING HUANG ◽  
WEN DONG ◽  
LIANG FANG ◽  
FENGANG ZHENG ◽  
MINGRONG SHEN
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Blue Shift ◽  
Charge Compensation ◽  
Spectra Analysis ◽  
Light Region ◽  
Compensation Mechanisms ◽  
Photocatalytic Activities ◽  
Absorbance Spectra ◽  
The Eu

In this paper, Eu3+ -doped CaTiO3 (CTO) nanoparticles were prepared by a sol-gel method. Three different charge compensation mechanisms were realized by substituting Eu ion at different sites. (i) Ca site substitution with Ca vacancy compensation (CTO-A); (ii) Ti site substitution with O vacancy compensation (CTO-B); (iii) simultaneous substitution at both Ca and Ti sites with self-compensation (CTO-AB). Strongly related to the site substitution, the photoluminescent (PL) intensities were increasing in the sequence of CTO-B > CTO-AB > CTO-A. The absorbance spectra analysis of pure CTO nanoparticles showed absorption in the UV light region, while the absorption of Eu -doped CTO samples exhibited the blue shift owing to the presence of Eu3+ . Moreover, the photocatalytic activities of samples for decomposing dyes were reverse to the sequence of PL intensities. The PL properties and photocatalytic activity of the Eu3+ -doped CTO nanoparticles were thus discussed in detail from the viewpoints of the microstructures and charge transfer-related processes.

scholarly journals Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1188
Author(s):  
Seong-Rak Eun ◽  
Shielah Mavengere ◽  
Bumrae Cho ◽  
Jung-Sik Kim
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Dip Coating ◽  
Light Illumination ◽  
Doped Tio2 ◽  
Light Region ◽  
Coating Method ◽  
Dip Coating Method ◽  
Band Gap Narrowing ◽  
Impurity Sites

Sol–gel synthesized N-doped and carbon–nitrogen–sulfur (CNS)-doped TiO2 solutions were deposited on upconversion phosphor using a dip coating method. Scanning electron microscopy (SEM) imaging showed that there was a change in the morphology of TiO2 coated on NaYF4:Yb,Er from spherical to nanorods caused by additional urea and thiourea doping reagents. Fourier transform infrared (FTIR) spectroscopy further verified the existence of nitrate–hyponitrite, carboxylate, and SO42− because of the doping effect. NaYF4:Yb,Er composites coated with N- and CNS-doped TiO2 exhibited a slight shift of UV-Vis spectra towards the visible light region. Photodecomposition of methylene blue (MB) was evaluated under 254 nm germicidal lamps and a 300 W Xe lamp with UV/Vis cut off filters. The photodegradation of toluene was evaluated on TiO2/NaYF4:Yb,Er and CNS-doped TiO2/NaYF4:Yb,Er samples under UV light illumination. The photocatalytic reactivity with CNS-doped TiO2/NaYF4:Yb,Er surpassed that of the undoped TiO2/NaYF4:Yb,Er for the MB solution and toluene. Photocatalytic activity is increased by CNS doping of TiO2, which improves light sensitization as a result of band gap narrowing due to impurity sites.

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