Antireflective coating based on TiO2 nanoparticles modified with coupling agents via acid-catalyzed sol-gel method

Purcar, Violeta; Rădiţoiu, Valentin; Dumitru, Anca; Nicolae, Cristian‐Andi; Frone, Adriana Nicoleta; Anastasescu, Mihai; Rădiţoiu, Alina; Raduly, Florentina Monica; Gabor, Raluca Augusta; Căprărescu, Simona

doi:10.1016/j.apsusc.2019.02.256

Cited by 54 publications

(25 citation statements)

References 35 publications

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“…Therefore, the objective of our work was to investigate the photoluminescent properties of some materials containing SAA entrapped in silica hybrid matrices, as attractive optical film-forming systems, previously investigated by us as antireflective coatings [14], which can be obtained by using a facile preparation method. Based on the special intrinsic properties of phenol-keto equilibrium [15,16] combined with the effect of interactions between the embedded fluorophore and the host matrices, the study can lead to important findings about the possibilities of tuning the optical properties of this type of luminescent films, in order to obtain highly luminescent and transparent hybrid silica films, having large Stokes shifted fluorescence emission, which is useful for the design of new luminescent solar concentrators (LSC) especially designed for integrated solar windows.…”

Section: Introductionmentioning

confidence: 99%

Fluorescent Silica Hybrid Film-Forming Materials Based on Salicylaldazine

Rădiţoiu

Raduly

et al. 2020

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Fluorescent film-forming materials were obtained by embedding salicylaldazine (SAA) in silica hybrids generated by sol–gel processes from different silane precursors in acid catalysis. Tuned local environments for the fluorophore were generated in the hosting network by modifying silica sols with organic groups through the co-condensation of tetraethylortosilicate (TEOS) and different alkoxysilanes hydrolysis products. The photophysical properties of the luminescent hybrid films were studied in direct relationship with structural, textural, and surface properties and based on interactions between SAA species and the silica hosting network. Film-forming materials were studied in order to determine differences in absorption and fluorescence emission due to the environments around the fluorophore. The variations recorded in the fluorescence emission spectra of the hybrid films were related to interactions established between the fluorophore species and their sterically hindered surroundings of the host hybrid silica, where free molecular motions are restricted. The influence of the type and amount of network modifier and of the fluorophore loading on the transparency of the films and fluorescence intensity was also investigated. The study carried out led to the elucidation of the necessary conditions for obtaining luminescent film-forming materials with high luminescence intensity and transparency useful for the design of new light concentrators.

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Section: Introductionmentioning

confidence: 99%

Fluorescent Silica Hybrid Film-Forming Materials Based on Salicylaldazine

Rădiţoiu

Raduly

et al. 2020

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“…In addition, the absorption band at around 908 cm −1 , which is observed in the spectrum of TNC−O15, is assigned to the stretching vibration of Si‐O−Ti. This result can be attributed to the interaction between Si‐OH groups found in the head of ODTS with the Ti‐OH group from the condensed TiO 2 layer, forming Si‐O−Ti interaction by releasing water molecules . The absorption bands at about 2911 cm −1 and 2850 cm −1 , which is only observed in the TNC−O15, are attributed to asymmetrical and symmetrical (C−H) stretching vibrations, respectively (Figure b) .…”

Section: Resultsmentioning

confidence: 99%

A Facile Preparation of Transparent Ultrahydrophobic Glass via TiO₂/Octadecyltrichlorosilane (ODTS) Coatings for Self‐Cleaning Material

et al. 2020

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A facile strategy was developed to fabricate transparent ultrahydrophobic glass. First, TiO 2 films were deposited uniformly on untreated glass substrate after heating aqueous peroxotitanate thin films at 120°C for 1 h followed by octadecyltrichlorosilane (ODTS) modification. The as-fabricated surfaces were then possessed ultrahydrophobic properties because of the combination of the rough surface topography of TiO 2 and low surface energy due to ODTS monolayer. It was found that the water contact angle and sliding angle of the as-prepared coatings were about 146°and 7°, respectively. Besides, these coatings showed excellent self-cleaning performance compared to untreated glass in order to remove dirt particles with water droplets. It is believed that the current method could lead as low-cost and effective way to fabricate a very promising material for commercial and industrial coatings applications.

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“…The functionalization of TiO 2 surface with silane coupling agents, i.e., tetraethoxysilane and methyltriethoxysilane, is shown to decrease the reflectance of bare-TiO 2 films from 26 to 17.3% and 15.5%, respectively (Purcar et al, 2019). The surface modification of TiO 2 photocatalyst and SiO 2 /TiO 2 /SiO 2 -TiO 2 TLAR with fluoroalkylsilane and hexamethyldisilazane, respectively, promotes hydrophobicity and self-cleaning (Nakajima et al, 2000;Ye et al, 2013).…”

Section: Physicochemical Strategies For Improved Tio 2 Antireflection and Self-cleaning Propertiesmentioning

confidence: 97%

Antireflective Self-Cleaning TiO2 Coatings for Solar Energy Harvesting Applications

et al. 2021

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Titanium(IV) oxide (TiO2, titania) is well-known for its excellent photocatalytic properties, wide bandgap, chemical resistance, and photostability. Nanostructured TiO2 is extensively utilized in various electronic and energy-related applications such as resistive switching memory devices, flat panel displays, photodiodes, solar water-splitting, photocatalysis, and solar cells. This article presents recent advances in the design and nanostructuring of TiO2-containing antireflective self-cleaning coatings for solar cells. In particular, the energy harvesting efficiency of a solar cell is greatly diminished by the surface reflections and deposition of environmental contaminants over time. Nanostructured TiO2 coatings not only minimize reflection through the graded transition of the refractive index but simultaneously improve the device’s ability to self-clean and photocatalytically degrade the pollutants. Thus, novel approaches to achieve higher solar cell efficiency and stability with pristine TiO2 and TiO2-containing nanocomposite coatings are highlighted herein. The results are compared and discussed to emphasize the key research and development shortfalls and a commercialization perspective is considered to guide future research.

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Antireflective coating based on TiO2 nanoparticles modified with coupling agents via acid-catalyzed sol-gel method

Cited by 54 publications

References 35 publications

Fluorescent Silica Hybrid Film-Forming Materials Based on Salicylaldazine

Fluorescent Silica Hybrid Film-Forming Materials Based on Salicylaldazine

A Facile Preparation of Transparent Ultrahydrophobic Glass via TiO₂/Octadecyltrichlorosilane (ODTS) Coatings for Self‐Cleaning Material

Antireflective Self-Cleaning TiO2 Coatings for Solar Energy Harvesting Applications

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Antireflective coating based on TiO2 nanoparticles modified with coupling agents via acid-catalyzed sol-gel method

Cited by 54 publications

References 35 publications

Fluorescent Silica Hybrid Film-Forming Materials Based on Salicylaldazine

Fluorescent Silica Hybrid Film-Forming Materials Based on Salicylaldazine

A Facile Preparation of Transparent Ultrahydrophobic Glass via TiO2/Octadecyltrichlorosilane (ODTS) Coatings for Self‐Cleaning Material

Antireflective Self-Cleaning TiO2 Coatings for Solar Energy Harvesting Applications

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A Facile Preparation of Transparent Ultrahydrophobic Glass via TiO₂/Octadecyltrichlorosilane (ODTS) Coatings for Self‐Cleaning Material