Electrochromism and photochromism in amorphous molybdenum oxide films

Scarmínio, Jair; Lourenço, Airton; Gorenstein, A.

doi:10.1016/s0040-6090(96)09539-9

Cited by 118 publications

(65 citation statements)

References 13 publications

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“…the thermodynamically stable orthorhombic α-MoO 3 and the metastable monoclinic β-MoO 3 , that show optical switching upon thermal, photo (photochromism) [8][9][10] or electric (electrochromism) [11,12] excitations. Such an optical modulation (colouration/bleaching) is effectively used in many applications like smart windows and antidazzling coatings [13].…”

Section: Introductionmentioning

confidence: 99%

Structurally and mechanically tunable molybdenum oxide films and patterned submicrometer structures by electrodeposition

Quintana

Varea

Guerrero

et al. 2015

Electrochimica Acta

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Abstract1.5 m-thick molybdenum oxide films have been electrodeposited potentiostatically from 0.2 M Na 2 MoO 4 electrolyte onto indium tin oxide (ITO)/glass substrates at pH = 1, 6 and 9. The influence of cetyltrimethylammonium bromide (CTAB) surfactant on films' adhesion, morphology, degree of porosity, molybdenum speciation, and crystallographic structure has been systematically investigated. The addition of CTAB (0.01 M) to the bath clearly improves film adherence to the substrate, reduces cracking, and increases crystallinity. This has an impact on the physical properties of the films. In particular, both hardness (H) and Young's modulus (E) increase, as determined from nanoindentation tests.The growth of ordered arrays of molybdenum oxide submicrometer structures, including pillars and stripes, by electrodeposition onto e-beam lithographed Au/Ti/Si substrates is also reported.

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Section: Introductionmentioning

confidence: 99%

Structurally and mechanically tunable molybdenum oxide films and patterned submicrometer structures by electrodeposition

Quintana

Varea

Guerrero

et al. 2015

Electrochimica Acta

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“…In a recent paper 3 we used a dianionic dye to enhance the optical contrast of polypyrrole. Not only the use of dyes 4 , but other aspects are important: sol-gel deposition film methods 5 , temperature of deposition 6 , counterion color influence 7 , oxygen flow during sputtered films 8 , coating the electrochrome with thin gold or platinum layer 9 , etc.…”

Section: Introductionmentioning

confidence: 99%

Flexible electrochromic windows: a comparison using liquid and solid electrolytes

Girotto

Paoli

1999

J. Braz. Chem. Soc.

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Neste trabalho foram montados e caracterizados dois dispositivos eletrocrômicos (ou janelas eletrocrômicas) utilizando como materiais opticamente ativos polímeros instrinsecamente condutores. Os materiais usados na montagem foram os mesmos, exceto pelo eletrólito usado. No primeiro foi usado como eletrólito uma solução de carbonato de propileno e no segundo o elastômero poli(epicloridrina-co-oxido de etileno), ambos contendo LiClO4. A condutividade elétrica do eletrólito líquido é aproximadamente duas ordens de grandeza maior (10 -3 S cm -1) do que a do eletrólito sólido e foram obtidos excelentes resultados do ponto de vista eletrocrômico em ambos os casos. A eficiência eletrocrômica em 640 nm foi calculada em 700 C cm -2 para o dispositivo com eletrólito liquido e 360 C cm -2 para o dispositivo montado com eletrólito sólido. O uso de dispositivos eletrocrômicos de estado sólido tem chamado bastante atenção e suas vantagens são discutidas.In the present work, two electrochromic devices (or electrochromic windows) based on intrinsically conducting polymers were assembled and characterized. For both devices, the materials used on the assembling were the same except for the electrolyte layer. In the first, we used as electrolyte a propylene carbonate solution and in the second the elastomer poly(epichlorohydrin-co-ethylene oxide), both containing LiClO4. The conductivity of the liquid electrolyte (10 -3 S cm -1) is approximately two orders of magnitude higher than for the solid electrolyte and we obtained very good electrochromic properties in both cases. The calculated electrochromic efficiency at 640 nm was 700 C cm -2 for the liquid electrolyte device and 360 C cm -2 for the solid state device. Solid state electrochromic windows have been investigated and some of its advantages over windows with liquid electrolytes are discussed.

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“…Several energy-efficient window materials have been investigated, including heat mirror materials (Granqvist, 2007;Shanthi et al, 1982;Jie, Xin-shi, & Xing-fang, 1998), thermochromic materials (Granqvist, 2007;Miyazaki & Yasui, 2006;Takahashi, Hibino, & Kudo, 1996), photochromic materials (Granqvist, 2007;Armistead & Stookey, 1964;Scarminio, Lourenco, & Gorenstein, 1997;, and so on . The photochromic properties of WO 3 -based materials result from the reduction of W 6+ to W 5+ in the WO 3 host upon UV irradiation Miyazaki et al, 2012;Miyazaki et al, 2014;Miyazaki et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Photochromic Smart Windows Employing WO3-Based Composite Films

Miyazaki¹,

Ishigaki²,

Ota³

2017

JMSR

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WO 3 -based composite films were fabricated from peroxo-iso-poly tungstic acid and a transparent urethane resin, and the photochromic properties of the films were evaluated under sunlight from three seasons: spring, summer, and winter. All composite films exhibited photochromism under solar irradiation, and the coloring degree of the films varied with the sunlight intensity for each season. We estimate the energy efficiency of the colored composite films for various seasons.

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Electrochromism and photochromism in amorphous molybdenum oxide films

Cited by 118 publications

References 13 publications

Structurally and mechanically tunable molybdenum oxide films and patterned submicrometer structures by electrodeposition

Structurally and mechanically tunable molybdenum oxide films and patterned submicrometer structures by electrodeposition

Flexible electrochromic windows: a comparison using liquid and solid electrolytes

Photochromic Smart Windows Employing WO3-Based Composite Films

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