Bioinspired self-assembled nanoparticles with stable fluorescent properties in wide visible light region

In order to improve the visible light response and reaction efficiency of nitrogen-doped TiO2 set urea as nitrogen source, and silica gel as the load reagent adopt sol-gel method to prepare powder of nitrogen-doped TiO2 supported on SiO2 , use equal volume impregnation method to load MnO2 on catalyst, and then obtain the composite photocatalyst after drying, and roasting .The prepared composite catalysts were characterized by XPS, TEM, SEM, XRD and other methods. Moreover, the photo-catalytic activity of the composite catalysts under visible-light region was tested, and the influences of nitrogen content and calcinations temperature on the photo-catalytic activity were investigated. The results show that:(1) the range of light response of modified composite catalyst was expanded from ultraviolet region to visible-light region, which results in high visible-light catalytic activity in the degradation of methyl orange.(2) Through the mechanism of photo-catalytic reaction and the treatment effect analysis, MnO2 as catalytic resulting O2 can be served as a good electronic capture agent and improve the reaction efficiency.(3)With the reduction of nitrogen content,and the increase of calcination temperature, the visible-light catalytic activity was weakened.(4) The activity of catalyst was reused six times, without significant reduction and had excellent efficiency and stability.

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Structural and optical properties of AgCl-sensitized TiO2 (TiO2 @AgCl) prepared by a reflux technique under alkaline condition

Cerâmica ◽

10.1590/0366-69132018643702311 ◽

2018 ◽

Vol 64 (370) ◽

pp. 190-196 ◽

Cited By ~ 2

Author(s):

V. A. Mu’izayanti ◽

H. Sutrisno

Keyword(s):

Visible Light ◽

Surface Area ◽

Alkaline Condition ◽

Visible Light Region ◽

X Ray Diffraction ◽

Structural And Optical Properties ◽

Light Region ◽

Vis Spectroscopy ◽

Xrd Patterns ◽

Tio2 Rutile

Abstract The AgCl-sensitized TiO2 (TiO2@AgCl) has been prepared from the precursor of TiO2-rutile type which on its surface adsorb chloride anion (Cl-) and various amounts of silver using AgNO3 as starting material: AgNO3/(AgNO3+TiO2) mass ratio of 0.00, 1.14, 3.25, 6.38 and 10.32%. Reflux under alkaline condition was the employed technique. All samples were characterized by X-ray diffraction (XRD) and diffuse reflectance UV-vis spectroscopy. The sample without the addition of AgNO3 was analyzed by scanning electron microscope and surface area analyzer. The morphology of the sample showed a distribution of microspheres of approximately 0.5 to 1.0 µm and the specific surface area was 68 m2/g. XRD patterns indicated that the sample without the addition of AgNO3 contained two types of TiO2: rutile (major) and anatase (minor), whereas the samples with the addition of AgNO3 consisted of one phase of AgCl and two types of TiO2: rutile and anatase. The bandgaps of the samples were in the range of 2.97 to 3.24 eV, which were very close to the bandgap of intrinsic TiO2 powder. The presence of 0.8, 2.6 and 4.4 wt% of AgCl in each sample resulted in an additional bandgap in visible light region of 1.90, 1.94 and 2.26 eV, respectively, whereas the presence of 9.4 wt% of AgCl in the sample resulted in two bandgaps in visible light region of 1.98 and 1.88 eV.

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Nanocavity-Enhanced Giant Stimulated Raman Scattering in Si Nanowires in the Visible Light Region

Nano Letters ◽

10.1021/acs.nanolett.8b04666 ◽

2019 ◽

Vol 19 (2) ◽

pp. 1204-1209 ◽

Cited By ~ 6

Author(s):

Daksh Agarwal ◽

Ming-Liang Ren ◽

Jacob S. Berger ◽

Jinkyoung Yoo ◽

Anlian Pan ◽

...

Keyword(s):

Raman Scattering ◽

Visible Light ◽

Stimulated Raman Scattering ◽

Visible Light Region ◽

Si Nanowires ◽

Light Region ◽

Stimulated Raman

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THE OPTICAL AND EPR SPECTRA OF THE HYDROGEN ANNEALED KTiOPO4 CRYSTALS

Modern Physics Letters B ◽

10.1142/s0217984999000816 ◽

1999 ◽

Vol 13 (18) ◽

pp. 645-648 ◽

Cited By ~ 2

Author(s):

V. A. NAZAROVA ◽

V. N. EFIMOV ◽

M. A. LARUHIN

Keyword(s):

Optical Absorption ◽

Visible Light ◽

Epr Spectra ◽

Hydrogen Treatment ◽

Visible Light Region ◽

Light Region

In this work, the results of the hydrogen treatment and following that, the annealing in air of flux-grown KTiOPO 4 (KTP) crystals are represented. We have tried to correlate our optical and EPR results. The main conclusion is that the Ti 3+ A, B, C, D centers are not associated with optical absorption in the visible light region.

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