Electrochromism of DC magnetron sputtered TiO2 thin films: Role of deposition parameters

Electrochromism in sputter-deposited W-Ti oxide films: Durability enhancement due to Ti. Solar Energy Materials and Solar AbstractThin films of W-Ti oxide were prepared by reactive DC magnetron sputtering and were characterized by Rutherford backscattering spectrometry, X-ray diffraction, scanning electron microscopy and atomic force microscopy. The electrochromic properties were studied by cyclic voltammetry in an electrolyte of lithium perchlorate in propylene carbonate and by optical transmittance measurements. The addition of Ti significantly promoted the amorphous nature of the films and stabilized their electrochemical cycling performance and dynamic range for electrochromism.

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“…The work is an extension of recent studies on electrochromism in W oxide [34,35] and Ti oxide [36,37]. DektakXT instrument.…”

Section: Introductionmentioning

confidence: 98%

Electrochromism in sputter-deposited W–Ti oxide films: Durability enhancement due to Ti

Arvizu

Triana

Stefanov

et al. 2014

Solar Energy Materials and Solar Cells

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“…Anatase and rutile are employed in H 2 production, 6 are able to degrade both volatile organic compounds 7,8 and recalcitrant/persistent pollutants, 9 and are also reported to be active against several bacterial strains and yeasts. 10−12 TiO 2 has also been studied for its electrochromic behavior: 13,14 reversible and persistent changes in the optical properties can be obtained by charge insertion/extraction. 15 Recently, TiO 2 has been shown to possess a degree of photochromic behavior; photochromism can be defined as that phenomenon in which the material can change color in a reversible way by exposure to an electromagnetic radiation (UV, visible, and IR illumination).…”

Section: Introductionmentioning

confidence: 99%

Cu–TiO₂ Hybrid Nanoparticles Exhibiting Tunable Photochromic Behavior

et al. 2015

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Pure and copper-modified photocatalytic TiO 2 nanopowders were prepared via a green sol−gel route and heated to 450°C. Copper does not enter the TiO 2 lattice but forms as smaller ∼2 nm Cu-based nanocrystals, decorating the surface of ∼10 nm TiO 2 nanoparticles. The surface of the larger TiO 2 nanoparticles (NPs) is partially covered by much smaller Cu NPs, attached to the surface of the larger NPs but not completely covering them due to the small quantity present (1−10 mol % Cu). This retards the anatase-to-rutile phase transition and titania domain growth through a grain-boundary pinning mechanism. These hybrid nanoparticles show tunable photochromic behavior under both UVA and visible light. Under UVA, Cu 2+ nanoparticles reduce to Cu + , and then to Cu 0. Under visible-light, Cu 2+ reduces to Cu + , although to a lesser extent. The induced photochromism can be tuned by varying the light source or exposure time. One mol % Cu causes a reduction of Cu 2+ , and lowers the d−d absorption band, to 50% after only 12 s, and 95% after 10 min, under UVA-light, and has a reduction of 25% in 1 min, 50% in 4 min, and 80% in 1 h under visible-light. This is the first report of inorganic compounds, in this case Cu-TiO 2 hybrid nanoparticles, to exhibit tunable photochromism under both UVA and visible-light exposure. This rapid and sensitive effect can potentially be used to modify, tune, or monitor the progress of photoactivated behavior in a new generation of smart/active multifunctional materials and photoactive devices or sensors.

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“…TiO 2 ince filmler hazırlanırken RF saçtırma [20], ultrasonik sprey piroliz [21], kimyasal buhar depolama [22], darbeli lazer biriktirme [23], DC magnetron [24], sol-jel [25,26] gibi birçok ince film kaplama yöntemi kullanılmaktadır. Bu yöntemlerden biri olan sol-jel yöntemi, homojen yapı elde edilmesi, her aşamanın kontrol altında tutulabilmesi, basit cihazlar gerektirmesi ve düşük sıcaklıklarda uygulanabilir olması sebebiyle metal oksit kaplamalar hazırlamak için kullanışlı bir yöntemdir [27].…”

Section: Optical and Electrochromic Properties Of Tio2 Films Preparedunclassified

Sol-Jel Yöntemiyle Hazırlanan TiO2 Filmlerin Optik ve Elektrokromik Özellikleri

Sorar

Sarigül

2016

Marmara Fen Bil Dergisi

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ÖZBu çalışmada sol-jel kaplama yöntemi kullanılarak Corning cam ve ITO altlıklar üstüne titanyum dioksit (TiO 2 ) filmleri kaplanmıştır. Kaplama işlemi için oluşturulan çözelti uygun miktarda titanyum (IV) n-bütoksit, asetik asit ve etanol içermektedir. Filmlerin taşıyıcılar üstüne kaplanmasında 2000 devir/dakika hızında döndürerek kaplama yöntemi kullanılmıştır. Filmler çeşitli sıcaklıklarda ısıl işleme tabi tutulmuş ve analiz edilmişlerdir. Filmlerin yapısal analizi X-ışınları kırınımı kullanılarak yapılmıştır. Geçiş metallerinin oksitleri ince film formunda elektrokromik özellik göstermektedirler. Geçiş metallerinin oksitleri arasında olan titanyum dioksit (TiO 2 )'in ince filmlerinin hazırlanması ve karakterizasyonu, elektrokromik malzemeler arasında popüler bir araştırma konusudur [7][8][9]. TiO 2 ince filmler yüksek kırma indisine ve yüksek yasak Optical and Electrochromic Properties of TiO2 Films Prepared by Sol Gel Method AbSTRACTIn this study thin films of titanium dioxide (TiO 2 ) were prepared on Corning glass and ITO substrates by sol-gel method. The solution prepared for coating have an amount of mixture of titanium (IV) n-butoxide, acetic acid and ethanol. Preparation of the films on the substrates was made by spin coating method at 2000 rpm. Following a heat treatment at various temperatures, films were characterized. The structural analyses of the films were done through X-ray diffraction. 1, 3 and 5 layers of TiO 2 films prepared on Corning glass and annealed at 120 o C and 500 o C were found to be amorphous. Band gap of amorphous TiO 2 films changes between 3.78 eV and 4.04 eV. However, 7 layer-prepared film annealed at 500 o C was found to be crystalline anatase phase. Band gap of the crystalline films was found to be 3.82 eV. Optical measurement showed that films have high transparency. Electrochemical measurements were made by using Ag/AgCl as reference electrode, platinum wire as counter electrode and TiO 2 as working electrode in 1 M KOH solution. Films showed cathodic electrochromic coloration.

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Electrochromism of DC magnetron sputtered TiO2 thin films: Role of deposition parameters

Cited by 49 publications

References 108 publications

Electrochromism in sputter-deposited W–Ti oxide films: Durability enhancement due to Ti

Electrochromism in sputter-deposited W–Ti oxide films: Durability enhancement due to Ti

Cu–TiO₂ Hybrid Nanoparticles Exhibiting Tunable Photochromic Behavior

Sol-Jel Yöntemiyle Hazırlanan TiO2 Filmlerin Optik ve Elektrokromik Özellikleri

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Electrochromism of DC magnetron sputtered TiO2 thin films: Role of deposition parameters

Cited by 49 publications

References 108 publications

Electrochromism in sputter-deposited W–Ti oxide films: Durability enhancement due to Ti

Electrochromism in sputter-deposited W–Ti oxide films: Durability enhancement due to Ti

Cu–TiO2 Hybrid Nanoparticles Exhibiting Tunable Photochromic Behavior

Sol-Jel Yöntemiyle Hazırlanan TiO2 Filmlerin Optik ve Elektrokromik Özellikleri

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Product

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Cu–TiO₂ Hybrid Nanoparticles Exhibiting Tunable Photochromic Behavior