TiO2–SiO2 sol–gel hybrid films and their sensitivity to gaseous toluene

Zaharescu, M.; Barau, A.; Predoană, Luminița; Gärtner, M.; Anastasescu, Mihai; Mrázek, Jan; Kašík, Ivan; Matejec, Vlastimil

doi:10.1016/j.jnoncrysol.2007.07.098

Cited by 12 publications

(10 citation statements)

References 20 publications

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“…To prepare the DBR operating at 980 nm and to meet all the introduced criteria on the film optical properties, the films were thermally treated at 1000 ° C. For this processing temperature the refractive index of the Zn2TiO4 film was 1.910. The refractive index of the SiO2 film was equal to 1.421 and the reported value [19] was verified by spectroscopic ellipsometry analysis provided in the Supplementary Interactive Plot Data. To achieve the Bragg's reflection centered at 980 nm, 980, the Bragg's condition [5]:…”

Section: Accepted Manuscript Fabrication and Properties Of Dbrmentioning

confidence: 82%

“…The colloidal precursor of porous SiO2 was prepared by controlled hydrolysis of tetraethylorthosilicate (TEOS) (Sigma-Aldrich, >98%) by modification of the already published approach [19]. A solution prepared by mixing 3.5 ml of demi-water, 100 l of 37% hydrochloric acid (Sigma-Aldrich, ACS reagent ), and 11 ml of absolute ethanol (Sigma-Aldrich, Spectranal grade) was dropped to the solution prepared by dissolving 15 ml of TEOS in 20 ml of ethanol (Sigma-Aldrich, Spectranal grade).…”

Section: Preparation Of Thin Films and Dbrmentioning

confidence: 99%

“…Referred approach allows to prepare mesoporous thin films exhibiting high durability and stability toward various vapors and industrial solvents. The presence of the pores caused the films' refractive index is lower than that of fully densified SiO2 [19]. AccuThermo AW410 (Allwin21 corporation) for 60 s under an oxygen flow of 5 lmin -1 and a heating rate of 10 Cs -1 .…”

Section: Preparation Of Thin Films and Dbrmentioning

confidence: 99%

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Nanocrystalline Zn2TiO4 films for distributed Bragg's reflectors operating in near infrared region

et al. 2021

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We present a generic sol-gel approach for the preparation of a distributed Bragg reflector (DBR) based on combining nanocrystalline Zn2TiO4 with amorphous SiO2 xerogel films. We determined the effects of the annealing temperatures on the structural and optical properties of nanocrystalline Zn2TiO4 films. The increasing size of nanocrystals and film's density caused a regular growth of the films' refractive indices at 632 nm from the value of 1.837 to 1.960. The acquired data were applied to design the DBR with tailored reflectance at 980 nm and the data predicted by the theoretical model were compared with experimental transmission and reflection spectra. Although the high optical losses caused by the Rayleigh scattering were observed at short wavelengths, the prepared films were fully transparent above 600 nm. The uniform dielectric structure reflecting over 97% of incident light at 980 nm was prepared from eight Bragg's pairs. The normalized spectral bandwidth was about 0.22. We proved the nanocrystalline films exhibiting scattering in UV-VIS spectral region can be used for the construction of the distributed Bragg's reflectors operating in near infrared region. The presented approach can be easily extended to other nanocrystalline films allowing the integration of nanocrystalline luminophores into advanced photonic structures.

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Section: Accepted Manuscript Fabrication and Properties Of Dbrmentioning

confidence: 82%

Section: Preparation Of Thin Films and Dbrmentioning

confidence: 99%

Section: Preparation Of Thin Films and Dbrmentioning

confidence: 99%

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Nanocrystalline Zn2TiO4 films for distributed Bragg's reflectors operating in near infrared region

et al. 2021

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“…This, configuration is usually referred as cladding removed (CR) followed by the optical fiber type such as multi-mode fiber (MMF) or plastic optical fiber (POF) and have been largely exploited in literature for the development of optical fiber sensors for ammonia [86,87], humidity [88,89], toluene [90], H 2 S [91,92], aerosol [93] or pH [94][95][96][97][98][99][100][101][102][103][104] detection.…”

Section: Absorbance-based Sensorsmentioning

confidence: 99%

Nanostructured Materials in Optical Fiber Sensing

Hernáez¹

2013

TOOPTSJ

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This work comprehends a review of nanostructured materials employed in the fabrication of optical fiber sensors in the last years. The continuous advances in nanofabrication techniques have enabled to manipulate the matter precisely producing well defined nanostructurated coatings or repetitive patterns at nanoscale level. The interactions of light with these nano-organized materials or patterns at the nanoscale level enable to observe interesting phenomena, such as interferometry, fluorescence, absorbance, resonances and many others which can be exploited in the fabrication of sensing devices. A particular case consists of optical fiber sensors, where the light travelling through an optical fiber interacts with the sensitive layer. The properties of the sensitive layer, such as the organization, physical properties, chemical bounds etc. will determine the sensing characteristics of the final device. The utilization of some of the most common nanostructured materials, such as polymers, nanoparticles, metals, metal oxides or biological coatings are reviewed here.

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“…Titania-silica mixed oxides have attracted significant research interest, because of their wide range of applications, such as glasses with a low thermal coefficient [36] or high strength [37], super-hydrophilic surfaces [38,39], implant coatings for direct tissue attachment [40,41], high-k dielectric materials [42], optical sensors [43][44][45], antireflection coating for solar cells [46], optical planar waveguide [47][48][49], and heterogeneous catalysts [50][51][52][53][54]. Various kinds of TiO 2 -SiO 2 composites have been developed, which involve spherical particles [55,56], thin films [39,44,46], fibers [57,58], and porous materials [50,54,59].…”

Section: Water-soluble R-sio 15 /Tio 2 Hybrid Nanoparticles By Coconmentioning

confidence: 99%

Design and Synthesis of Functional Silsesquioxane-Based Hybrids by Hydrolytic Condensation of Bulky Triethoxysilanes

Mori

2012

International Journal of Polymer Science

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This paper presents a short overview of recent advances in the design and synthesis of organic-inorganic hybrids using silsesquioxane-based nanoparticles having nanometer size, relatively narrow size distribution, high functionalities, and various characteristic features, mainly focusing on our recent researches related to the subject. A highlight of this paper is the water-soluble silsesquioxane-based nanoparticles, including hydroxyl-functionalized and cationic silsesquioxanes, which were synthesized via the one-step condensation of the bulky triethoxysilane precursors. The design and synthesis of R-SiO1.5/SiO2and R-SiO1.5/TiO2hybrids by hydrolytic cocondensation of a triethoxysilane precursor and metal alkoxides are briefly introduced. This paper also deals with recent results in stimuli-responsive hybrids based on the water-soluble silsesquioxane nanoparticles and fluorinated and amphiphilic silsesquioxane hybrids.

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TiO2–SiO2 sol–gel hybrid films and their sensitivity to gaseous toluene

Cited by 12 publications

References 20 publications

Nanocrystalline Zn2TiO4 films for distributed Bragg's reflectors operating in near infrared region

Nanocrystalline Zn2TiO4 films for distributed Bragg's reflectors operating in near infrared region

Nanostructured Materials in Optical Fiber Sensing

Design and Synthesis of Functional Silsesquioxane-Based Hybrids by Hydrolytic Condensation of Bulky Triethoxysilanes

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