Sol–gel preparation and characterization of anti-reflective and self-cleaning SiO2–TiO2 double-layer nanometric films

Kesmez, Ömer; Çamurlu, H. Erdem; Burunkaya, Esin; Arpaç, Ertuğrul

doi:10.1016/j.solmat.2009.06.022

Cited by 131 publications

(58 citation statements)

References 27 publications

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“…UV-light cut and low emissivity self-cleaning glazing can be achieved by integrating CeO 2 and TiN with TiO 2 via sol gel processing [50]. The benefits of integrating antireflective properties with self-cleaning coatings using typically sol-gel processing and sputtering processes have been reported [51][52][53]. It is well known that in photovoltaic cells glass transparency is strictly linked with efficiency which is believed to drop by 33% per 1 g/m 2 of dust accumulation on the surface [54].…”

Section: Multifunctional Hydrophilic Self-cleaning Coatingsmentioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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Functional thin films provide many opportunities for advanced glazing systems. This can be achieved by adding additional functionalities such as self-cleaning or power generation, or alternately by providing energy demand reduction through the management or modulation of solar heat gain or blackbody radiation using spectrally selective films or chromogenic materials. Self-cleaning materials have been generating increasing interest for the past two decades. They may be based on hydrophobic or hydrophilic systems and are often inspired by nature, for example hydrophobic systems based on mimicking the lotus leaf. These materials help to maintain the aesthetic properties of the building, help to maintain a comfortable working environment and in the case of photocatalytic materials, may provide external pollutant remediation. Power generation through window coatings is a relatively new idea and is based around the use of semi-transparent solar cells as windows. In this fashion, energy can be generated whilst also absorbing some solar heat. There is also the possibility, in the case of dye sensitized solar cells, to tune the coloration of the window that provides unheralded external aesthetic possibilities. Materials and coatings for energy demand reduction is highly desirable in an increasingly energy intensive world. We discuss new developments with low emissivity coatings as the need to replace scarce indium becomes more apparent. We go on to discuss thermochromic systems based on vanadium dioxide films. Such systems are dynamic in nature and present a more sophisticated and potentially more beneficial approach to reducing energy demand than static systems such as low emissivity and solar control coatings. The ability to be able to tune some of the material parameters in order to optimize the film performance for a given climate provides exciting opportunities for future technologies. In this article, we review recent progress and challenges in these areas and provide a perspective for future trends and developments.

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Section: Multifunctional Hydrophilic Self-cleaning Coatingsmentioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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“…One of the serious concerns in this work is that after doping with non-metal ion, although it becomes active under visiblelight irradiation, the activity is not as pronounced as in the case of UV light. Another approach is to make metal oxide-metal nanocomposites [45]. The driving mechanism in these cases is the decrease in band gap due to doping leading to higher fraction of visible photons being absorbed.…”

Section: Self-cleaning Action Of Metal Oxide With Metal and Non-metalmentioning

confidence: 99%

Metal oxide thin films and nanostructures for self-cleaning applications: current status and future prospects

Krishna

Madhurima

Purkayastha

2013

Eur. Phys. J. Appl. Phys.

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Abstract. Surfaces that exhibit reversible wettability toward water are extremely important for a variety of technological applications. In this context, the development of superhydrophobic and superhydrophilic surfaces for self-cleaning applications has been receiving a great deal of attention in the last few years. In this review, an overview of the current state-of-science and technology of self-cleaning surfaces is presented. The current understanding of physics of wetting leading to surfaces with predictive, controllable and reversible wettability is first presented. The review then focuses on materials, mainly metal oxides and their composites, employed for self-cleaning applications. It is shown that, although conventionally oxides and polymers are considered for self-cleaning applications, recent developments point toward the use of artificially engineered surfaces with hierarchical roughness. Applications of self-cleaning films in nonconventional areas such as protection of fabrics, solar cells and structures related to cultural heritage are discussed. The review ends with an outlook for the future in terms of science and technology of self-cleaning surfaces.

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“…The most investigated photocatalyst, which can oxidize and decompose organic and inorganic contaminants, is titania in the anatase modification. For solar applications, several multilayer systems with antireflective (AR) and antifouling (AF) properties, containing titania, have been investigated [6][7][8][9][10][11][12], and a bifunctional AR and AF single layer from dispersed TiO 2 in a silica matrix has also been studied [13].…”

Section: Introductionmentioning

confidence: 99%

Interface Crystallization of Ceria in Porous Silica Films for Solar Applications

Helsch

Deubener

2017

Crystals

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Antireflective (AR) coatings with photocatalytic activity for solar cover glasses are extensively investigated at present, mostly in multilayer systems including titania. In this study, bifunctional single coats from porous silica in combination with up to 33 mol % ceria were prepared by sol-gel dip-coating on low-iron soda-lime float glass. After heat treatment for one hour at 350 • C, the coated glasses were characterized. Solar transmittance decreased with increasing ceria content, whereas photocatalytic activity increases. Crystallization of cubic ceria was detected by grazing incidence X-ray diffraction. Chemical depth profiling by secondary neutral mass spectrometry revealed the enrichment of cerium at the coating surface as well as at the interface to the glass substrate. Self-assembled ceria crystallization at the interfaces resulted in a three-layered mesostructure of the coating, which was verified by field-emission scanning electron spectroscopy. Cubic ceria crystals at the interface act as a barrier for the sodium diffusion from the substrate, which prevents the poisoning of the photocatalyst, while those crystals at the surface act as an electron donor for photooxidation processes, both enabling adequate photocatalytic activity. The triple-layer architecture with the sequence of high/low/high refractive index materials allows for optical interference sustaining the AR-function.

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Sol–gel preparation and characterization of anti-reflective and self-cleaning SiO2–TiO2 double-layer nanometric films

Cited by 131 publications

References 27 publications

Thin Films for Advanced Glazing Applications

Thin Films for Advanced Glazing Applications

Metal oxide thin films and nanostructures for self-cleaning applications: current status and future prospects

Interface Crystallization of Ceria in Porous Silica Films for Solar Applications

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