XRD studies of thermally stable mesoporous tungsten oxide synthesised by a templated sol–gel process from tungstic acid precursor

Wang, Wei; Pang, Yongxin; Hodgson, Simon

doi:10.1016/j.micromeso.2009.01.014

Cited by 47 publications

(25 citation statements)

References 56 publications

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“…Among these inorganic materials, vanadium oxide thin films have been gained great interests, owing to their multi-color electrochromic behaviors [10]. V 2 O 5 thin films can be fabricated using either physical vapor deposition techniques (such as magnetron sputtering [11], pulsed laser deposition [12]), or solution-based techniques (such as sol-gel [13], spin coating [14], and electrochemical deposition). Structural and EC properties of the V 2 O 5 thin films depend not only on the deposition parameters but also post-annealing processes.…”

Section: Introductionmentioning

confidence: 99%

Effect of post-annealing on structural and electrochromic properties of Mo-doped V2O5 thin films

Wei

Zhang

Cao

et al. 2015

J Sol-Gel Sci Technol

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The effect of post-annealing on the structural and electrochromic properties of the Mo-doped V 2 O 5 thin films was investigated in this paper. With varying the annealing temperature, the interlayer distance is increased from 1.16 (as-deposited) to 1.38 nm (annealing at 250°C), and the enlarged interlayer spacing would facilitate ion movement in between the interlayers inside the electrochromic matrix. Therefore, both the optical modulation and color efficiency of the Mo-doped V 2 O 5 thin films are enhanced after appropriate post-annealing treatment. Our results demonstrate that Mo-doped V 2 O 5 material is one of the promising candidates to be used in multi-color electrochromic devices. Graphical Abstract The ability to modulate optical transmittance of the Mo-doped V 2 O 5 thin films is greatly enhanced by means of the larger interlayer distance after annealing.

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Section: Introductionmentioning

confidence: 99%

Effect of post-annealing on structural and electrochromic properties of Mo-doped V2O5 thin films

Wei

Zhang

Cao

et al. 2015

J Sol-Gel Sci Technol

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“…In comparison with some other ineffective organic surfactant templated systems tested in our previous work [17], Tween 60 showed no improvement in templating the formation of mesoporous TOFs according to the XRD results ( Fig.1(c-d)). This is again in big contrast with the Brij 56 templated TOFs.…”

Section: Morphological and Structural Studies Of Pta/surfactant Hybrimentioning

confidence: 53%

“…In the case of the Brij 56 templated PTA system, the optimisation of heating process was also found to be crucial to generate thermally stable mesoporous tungsten oxides. An additional heat treatment step at intermediate temperatures, such as 190 o C or 250 o C, was found to effectively stabilise the frameworks allowing them to sustain further heat treatment at high temperatures up to 450 o C [17]. In order to further clarify the reactions occurring in the PTA/Brij 56 hybrid films during the heat treatments, attenuated total reflectance spectra were collected on samples heated at varying temperatures (Fig.…”

Section: Morphological and Structural Studies Of Pta/surfactant Hybrimentioning

confidence: 99%

“…Recently, our research group has demonstrated the feasibility of fabricating thermally stable mesoporous TOFs from cheap tungstic acid [17]. In this paper, detailed characterisation of the mesostructures and the resultant properties, especially the electrochromic properties of the derived TOFs are discussed, aiming to demonstrate a new, cheap, easy and reliable surfactant templated sol-gel method for the fabrication of mesostructured TOFs with great potential in electrochromic devices.…”

Section: Introductionmentioning

confidence: 99%

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Preparation, characterisation and electrochromic property of mesostructured tungsten oxide films via a surfactant templated sol–gel process from tungstic acid

Wang

Pang

Hodgson

2010

J Sol-Gel Sci Technol

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“…Başlangıç malzemeleri ve onların katkı oranları, reaksiyonun tersinirliğini, renklenme etkinliğini ve yüklenme kapasitesini etkilemektedir. Literatürde genellikle yüzey aktif malzeme olarak kullanılan F-127, P-123 gibi polimerlere göre değişim ile tungsten alkoksit çeşitliliğine bağlı olan değişimlere bakılmış, ancak su miktarına bağlı filmin özelliklerindeki değişim incelenmemiştir [5,[11][12]. Bu nedenle, bu çalışmada farklı H2O:WO3 oranlarında hazırlanmış tungsten oksit filmlerin yapısal, optik ve elektrokromik özellikleriyle ve sabit bir H2O:WO3 oranı için farklı ısıl işlem sıcaklıklarına bağlı olarak filmlerin özelliklerinin değişimi araştırılmıştır.…”

Section: Introductionunclassified

Sol Jel Döndürme Yöntemiyle Hazırlanan WO3 Nano Yapılı Filmlerin Yapısal, Optik ve Elektrokromik Özelliklerine Parçacık Boyutunun Etkisi

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2017

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Özet: Bu çalışmada, sol-jel döndürerek kaplama tekniği kullanılarak ITO cam altlıklar üzerine hazırlanmış nano yapılı WO3 filmlerin yapısal, elektrokromik ve optik özellikleri, üretim parametrelerine bağlı olarak incelenmiştir. WO3 solünde, H2O:WO3 oranı değiştirilerek farklı parçacık boyutları içeren soller elde edilmiştir. Üretilen sollerden döndürerek kaplama yöntemi ile 2000 dev/dk hızda filmler hazırlanmıştır. Tüm filmlere 1.5 saat süreyle 300, 325, 350 ve 375 0 C'lerde ısıl işlem uygulanarak filmlerin yapısal ve optik özellikleri incelenmiştir. Parçacık boyutlarının H2O:WO3 oranı ve ısıl işlem sıcaklık değerlerinin artmasıyla artış gösterdiği atomik kuvvet mikroskopu (AFM) ve taramalı elektron mikroskopu (SEM) ile belirlenmiştir. X-ışını kırınımı (XRD) analizi sonucunda, filmlerin monoklinik faz yapısında olduğu gözlenmiş olup parçacıkların büyümesi için gerekli aktivasyon enerjisi 22.17 kJ /mol olarak hesaplanmıştır. Filmlerin yapısal ve morfolojik özelliklerinin yanı sıra elektrokimyasal ve optik özellikleri de incelenmiş, bu özellikler potentiostat ve uv-vis spektrofotometre kullanılarak karakterize edilmiştir. Abstract:In this study, the structural, electrochromic and optical properties of tungsten oxide (WO3), which are produced on ITO glass substrates using the solgel spin coating technique has been observed in relation to the process parameters. The sols which contains different particle sizes obtained by changing the H2O:WO3 ratio in WO3 sol. From produced sols prepared with spin coating at 2000 rpm. All films annealed for a period of 1.5 hours at 300, 325, 350 0 C, structural and optical properties of films were investigated. The particle sizes were increased with the increase of H2O:WO3 ratio and temperature values of heat treatment were determined by the rate of atomic force microscopy (AFM) and scanning electron microscope (sem). As a result of X-ray diffraction (XRD) analysis, that are observed in the monoclinic phase structure of the film films, as a result of the particles the necessary activation energy for the growth of 22.17 kJ /mol was calculated. Structural and morphological properties of the films, as well as the electrochemical and optical properties is also studied, the properties has been characterized using potentiostat, and UV-vis spectrophotometer.

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XRD studies of thermally stable mesoporous tungsten oxide synthesised by a templated sol–gel process from tungstic acid precursor

Cited by 47 publications

References 56 publications

Effect of post-annealing on structural and electrochromic properties of Mo-doped V2O5 thin films

Effect of post-annealing on structural and electrochromic properties of Mo-doped V2O5 thin films

Preparation, characterisation and electrochromic property of mesostructured tungsten oxide films via a surfactant templated sol–gel process from tungstic acid

Sol Jel Döndürme Yöntemiyle Hazırlanan WO3 Nano Yapılı Filmlerin Yapısal, Optik ve Elektrokromik Özelliklerine Parçacık Boyutunun Etkisi

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