scholarly journals Impact of γ-rays Irradiation on Hybrid TiO2-SiO2 Sol-Gel Films Doped with RHODAMINE 6G

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5754
Author(s):  
Maxime Royon ◽  
Francis Vocanson ◽  
Damien Jamon ◽  
François Royer ◽  
Emmanuel Marin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Rhodamine 6G ◽  
Sol Gel ◽  
Host Matrix ◽  
Sensing Applications ◽  
Luminescent Films ◽  
Radiation Induced ◽  
Γ Rays ◽  
Uv Photons ◽  
Sol Gel Films

In the present paper, we investigate how the optical and structural properties, in particular the observed photoluminescence (PL) of photocurable and organic-inorganic TiO2-SiO2 sol-gel films doped with Rhodamine 6G (R6G) are affected by γ-rays. For this, four luminescent films, firstly polymerized with UV photons (365 nm), were submitted to different accumulated doses of 50 kGy, 200 kGy, 500 kGy and 1 MGy while one sample was kept as a reference and unirradiated. The PL, recorded under excitations at 365 nm, 442 nm and 488 nm clearly evidences that a strong signal peaking at 564 nm is still largely present in the γ-irradiated samples. In addition, M-lines and Fourier-transform infrared (FTIR) spectroscopies are used to quantify the radiation induced refractive index variation and the chemical changes, respectively. Results show that a refractive index decrease of 7 × 10−3 at 633 nm is achieved at a 1 MGy accumulated dose while a photo-induced polymerization occurs, related to the consumption of CH=C, Si-OH and Si-O-CH3 groups to form Ti-O and Si-O bonds. All these results confirm that the host matrix (TiO2-SiO2) and R6G fluorophores successfully withstand the hard γ-ray exposure, opening the way to the use of this material for sensing applications in radiation-rich environments.

scholarly journals Mode Sensitivity Exploration of Silica–Titania Waveguide for Refractive Index Sensing Applications

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7452
Author(s):  
Muhammad A. Butt ◽  
Andrzej Kaźmierczak ◽  
Cuma Tyszkiewicz ◽  
Paweł Karasiński ◽  
Ryszard Piramidowicz
Keyword(s):  
Refractive Index ◽  
High Performance ◽  
Near Infrared ◽  
Sol Gel ◽  
Cost Effective ◽  
Dip Coating ◽  
Infrared Wavelength ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Coating Method

In this paper, a novel and cost-effective photonic platform based on silica–titania material is discussed. The silica–titania thin films were grown utilizing the sol–gel dip-coating method and characterized with the help of the prism-insertion technique. Afterwards, the mode sensitivity analysis of the silica–titania ridge waveguide is investigated via the finite element method. Silica–titania waveguide systems are highly attractive due to their ease of development, low fabrication cost, low propagation losses and operation in both visible and near-infrared wavelength ranges. Finally, a ring resonator (RR) sensor device was modelled for refractive index sensing applications, offering a sensitivity of 230 nm/RIU, a figure of merit (FOM) of 418.2 RIU−1, and Q-factor of 2247.5 at the improved geometric parameters. We believe that the abovementioned integrated photonics platform is highly suitable for high-performance and economically reasonable optical sensing devices.

Luminescence enhancement of rhodamine 6G in sol-gel films containing silver aggregates

1988 ◽  
Vol 153 (2-3) ◽  
pp. 210-214 ◽  
Author(s):  
R. Reisfeld ◽  
M. Eyal ◽  
D. Brusilovsky
Keyword(s):  
Rhodamine 6G ◽  
Sol Gel ◽  
Luminescence Enhancement ◽  
Sol Gel Films

Photodegradation of rhodamine 6G dimers in silica sol–gel films

2013 ◽  
Vol 271 ◽  
pp. 93-98 ◽  
Author(s):  
Barbara Lasio ◽  
Luca Malfatti ◽  
Plinio Innocenzi
Keyword(s):  
Rhodamine 6G ◽  
Sol Gel ◽  
Silica Sol ◽  
Sol Gel Films

Ellipsometric Imaging of Drying Sol-Gel Films

1988 ◽  
Vol 121 ◽  
Author(s):  
Alan J. Hurd ◽  
C. Jeffrey Brinker
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Dip Coating ◽  
Drying Process ◽  
Imaging Ellipsometry ◽  
Withdrawal Velocity ◽  
Coated Film ◽  
Sol Gel Films ◽  
Physical And Chemical ◽  
Dip Coated Films

ABSTRACTAlthough controlled dip-coating is an established way to apply high quality uniform coatings, the details of the coating and drying process have not been deeply studied. Depending on the physical and chemical state of the sol and the parameters of dipping (dipping angle and speed), a variety of thicknesses and porosities can be achieved [1]. For optical coatings, the refractive index and optical thickness can thereby be controlled.We have developed a method to view the drying front of a dip-coated film using broad beam ellipsometry [2], or “ellipsometric imaging.” In dip-coated films we take full advantage of the fact that a steady state is quickly reached where the drying line velocity matches the withdrawal velocity; however, the technique might also be used in unsteady situations such as spin coating. Imaging ellipsometry makes it possible to measure the refractive index and thickness profiles of both wet and dry films point-by-point in an entire image at once. These profiles provide important clues as to the relative importance of gravity, evaporation and other phenomena.

Characterization of Rhodamine 6G-Doped Thin Sol-Gel Films

1993 ◽  
Vol 47 (2) ◽  
pp. 229-234 ◽  
Author(s):  
Upvan Narang ◽  
Frank V. Bright ◽  
Paras N. Prasad
Keyword(s):  
Excited State ◽  
Rhodamine 6G ◽  
Sol Gel ◽  
Decay Kinetics ◽  
Time Resolved ◽  
Laser Illumination ◽  
State Decay ◽  
Sol Gel Films ◽  
Microscope Slides

Rhodamine 6G- (R6G) doped thin sol-gel films were cast on glass microscope slides and characterized with the use of steady-state and time-resolved fluorescence spectroscopy. The fluorescence intensity, photodegradation under laser illumination, and excited-state decay kinetics were all investigated as a function of dopant concentration. The excited-state decay kinetics of highly doped films show clear evidence of R6G aggregation. Photodegradation under laser illumination is very interesting and is discussed in detail.

Modification of Sol-Gel Thin Films By Ion Implantation

1994 ◽  
Vol 346 ◽  
Author(s):  
Hiroshi Hirashima ◽  
Kenji Adachi ◽  
Hiroaki Imai
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Ion Implantation ◽  
Sol Gel ◽  
The Other ◽  
Ir Absorption ◽  
Absorption Bands ◽  
Chemically Modified ◽  
Sol Gel Films ◽  
Ion Species

ABSTRACTIn order to densify and to improve the physical properties, TiO2 sol-gel films, about 100 nm in thickness, on silica glass or silicon wafer were implanted with Ar+ or B+ ions. The refractive index of the as-dried films increased and the IR absorption band of OH disappeared after Ar+ implantation. Drying and densification of sol-gel films were enhanced by Ar+ implantation. On the other hand, the refractive index and the thickness of the films hardly changed with B+ implantation. However, IR absorption bands of B-O bond were observed after B+ implantation. This suggests that sol-gel films could be chemically modified by ion implantation with reactive ion species.

Effect of heat treatment on formation of sol-gel (Pb, La)TiO3 films for optical application

1997 ◽  
Vol 12 (3) ◽  
pp. 812-818 ◽  
Author(s):  
Junmo Koo ◽  
Sung-Uk Kim ◽  
Dae Sung Yoon ◽  
Kwangsoo No ◽  
Byeong-Soo Bae
Keyword(s):  
Heat Treatment ◽  
Refractive Index ◽  
Film Thickness ◽  
Optical Transmission ◽  
Thick Films ◽  
Sol Gel ◽  
Propagation Loss ◽  
Optical Propagation ◽  
Lanthanum Titanate ◽  
Sol Gel Films

Lead lanthanum titanate [(Pb, La)TiO3] sol-gel films have been prepared to investigate the effect of heat treatment on the fabrication of uniform and crack-free thick films by applying different heating schedules. The surface morphology as well as the optical properties such as refractive index, optical transmission, and optical propagation loss of the films was examined, depending on the film thickness. Because the slower and longer heating is enough to remove the organic and nitrate residues and diminish the thermal shock while heating the films, slower and longer heating can produce the uniform and crack-free thick films having higher refractive index as well as lower optical propagation loss. Also, the drying and heating of the films on a hot plate in every coating resulted in the fabrication of thick films having above 8000 Å without any defects and microcracks. This film presented the highest refractive index as well as the lowest optical propagation loss which grows exponentially with increasing the film thickness due to the scattering of defects in the film.

scholarly journals Influence of rhodamine 6G doping on the optical properties of TiO2 sol-gel films

2005 ◽  
Vol 98 (7) ◽  
pp. 073516 ◽  
Author(s):  
S. A. Tomás ◽  
S. Stolik ◽  
R. Palomino ◽  
R. Lozada ◽  
C. Persson ◽  
...  
Keyword(s):  
Optical Properties ◽  
Rhodamine 6G ◽  
Sol Gel ◽  
Tio2 Sol ◽  
Sol Gel Films

Feasibility studies using thin sol–gel films doped with a novel lead-selective fluorophore for optical fibre sensing applications

Measurement ◽  
2013 ◽  
Vol 46 (8) ◽  
pp. 2971-2977 ◽  
Author(s):  
H. Guillemain ◽  
M. Rajarajan ◽  
Y.-C. Lin ◽  
C.-T. Chen ◽  
T. Sun ◽  
...  
Keyword(s):  
Optical Fibre ◽  
Sol Gel ◽  
Feasibility Studies ◽  
Sensing Applications ◽  
Sol Gel Films
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