Microstructural and electrochromic properties of tungsten oxide thin films produced by surfactant mediated electrodeposition

Deepa, Melepurath; Srivastava, A. K.; Sharma, Shailesh N.; Govind,; Shivaprasad, S. M.

doi:10.1016/j.apsusc.2007.09.035

Cited by 79 publications

(55 citation statements)

References 42 publications

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“…Electrochromism of WO 3 , the most typical property, was discovered by S. K. Deb in 1972 [1,2]. Investigations of WO 3 thin films revealed that the electrochromic properties depended on the crystallinity, particle size and morphology [3][4][5][6]. In particular, the porosity and particle size affect the ion exchange at the interface between the electrolyte and the film.…”

Section: Introductionmentioning

confidence: 97%

Influence of oxygen gas concentration on hydrogen sensing of Pt/WO3 thin film prepared by sol–gel process

Yamaguchi

Imamura

Ito

et al. 2015

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 97%

Influence of oxygen gas concentration on hydrogen sensing of Pt/WO3 thin film prepared by sol–gel process

Yamaguchi

Imamura

Ito

et al. 2015

Sensors and Actuators B: Chemical

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“…Deepa and co-workers also reported that the fast colour-bleach kinetics in mesostructured TOFs were associated with the mesopore morphology [12]. Cheng and co-workers demonstrated that mesoporous structures generated by a block copolymer templated sol-gel method using WCl 6 as precursor exhibited better kinetics for colouration and bleaching in comparison to the normal sol-gel-derived TOFs.…”

Section: Introductionmentioning

confidence: 91%

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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“…OH 2 groups in WO 3 . 31,32 The stretching mode of S-O in -SO 3 − in poly͑styrene sulfonate͒ of PEDOT:PSS also produces a band at 1215 cm −1 . 33 The presence of hydrogen-bonded W-OH .…”

Section: Journal Of the Electrochemical Society 155 ͑11͒ D703-d710 ͑mentioning

confidence: 99%

Nanostructured Tungsten Oxide-Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Hybrid Films: Synthesis, Electrochromic Response, and Durability Characteristics

Deepa

Srivastava

Sood

et al. 2008

J. Electrochem. Soc.

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Nanostructured hybrid thin films of the system tungsten oxide-poly͑3,4-ethylenedioxythiophene͒:poly͑styrenesulfonate͒ ͑WO 3 -PEDOT:PSS͒ were synthesized by first forming a tungsten-oxide layer by surfactant-assisted electrochemical method, followed by deposition of a PEDOT:PSS layer. The hybrid-film formation is primarily based on coulombic interactions between the surface hydroxyl groups of tungsten oxide and the positively charged centers on the polymer backbone; this has been confirmed by electron microscopy and X-ray diffraction. High-resolution transmission electron microscopy reveals that the tungsten-oxide host with a monoclinic unit cell resides along with the amorphous domains of PEDOT:PSS. The hybrid film, being a dual electrochrome, exhibits a much larger coloring efficiency ͑227 cm 2 C −1 at 600 nm͒, a higher redox activity ͑larger currents for ion ingress and egress are obtained within the same potential range͒, and, most importantly, a superior electrochemical cycling stability when compared to the neat polymer film. While the pristine polymer film lifts off irrevocably from the substrate upon 3000 cycles of coloring and bleaching, the hybrid film sustains about 5000 cycles, albeit with some changes in the nanoparticulate morphology, elemental composition, and development of some new artifacts on the film surface. The integration of organic and inorganic materials has aroused much interest in the scientific community for the use of hybrid organic-inorganic materials for catalysis, chiral synthesis, and enhancing electronic conductivity and electro-optical properties.1,2 To this end, this report describes a bilayer deposition of two different materials, an n-type semiconductor oxide, tungsten oxide ͑WO 3 ͒, and a p-type semiconductor, polymer ͑PEDOT:PSS͒, to yield a hybrid film and how its structure and composition influences the electrochemical and optical response and chemical stability of the film generated thereof. Since the discovery of electrochromism in WO 3 by Deb, 3 this oxide has been extensively investigated and has drawn considerable attention because of its application in electrochromic cells like smart windows, high-contrast displays, antiglare rearview mirrors, and so forth.4-6 PEDOT:PSS is one of the most widely studied electroactive polymers to date because of its excellent film forming ability, high conductivity, and high contrast ratio. [7][8][9] We found that the polymer forms a well-adherent uniform layer when deposited onto the WO 3 film, which indicates a strong affinity between the inorganic and organic species. The hybrid film offers the potential of realizing practical improvements of charge-transfer quanta through the bilayer/electrolyte interface and its reversibility as well. Furthermore, in the ever-growing field of solid-state electrochemical devices, the limited understanding of charge-transfer phenomena at the electrode-electrolyte interface is often a factor restricting operational lifetimes.In an approach to address these issues, in the past, PEDOT has been functio...

show abstract

Microstructural and electrochromic properties of tungsten oxide thin films produced by surfactant mediated electrodeposition

Cited by 79 publications

References 42 publications

Influence of oxygen gas concentration on hydrogen sensing of Pt/WO3 thin film prepared by sol–gel process

Influence of oxygen gas concentration on hydrogen sensing of Pt/WO3 thin film prepared by sol–gel process

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

Nanostructured Tungsten Oxide-Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) Hybrid Films: Synthesis, Electrochromic Response, and Durability Characteristics

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