Electrochromism of NiOxH y films grown by DC sputtering

Ying, Xu

doi:10.1016/s0927-0248(96)00021-9

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…6,7 Color switching properties of NiO (transmissive light green to deep brown), also make it potentially useful as a primary electrochromic material, where a 'neutral' colored state is desired. Electrochromic NiO thin films have been prepared by sputtering, [8][9][10] electron-beam deposition, 11 thermal evaporation, 12 electrodeposition, 13 template-assisted electrodeposition, 14 sol-gel, 15,16 chemical bath, 17 hydrothermal deposition, 18 chemical precipitation, 19 hotfilament metal-oxide vapor deposition, 20 and chemical vapor deposition (CVD) 21 techniques. We here report the first study of aerosol-assisted chemical vapor deposition (AACVD) of electrochromic NiO thin films and their characterization using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and optical absorption.…”

Section: Introductionmentioning

confidence: 99%

Electrochromic and Colorimetric Properties of Nickel(II) Oxide Thin Films Prepared by Aerosol-Assisted Chemical Vapor Deposition

Sialvi

Mortimer

Wilcox

et al. 2013

ACS Appl. Mater. Interfaces

112

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Aerosol-assisted chemical vapor deposition (AACVD) was used for the first time in the preparation of thin-film electrochromic nickel(II) oxide (NiO). The as-deposited films were cubic NiO, with an octahedral-like grain structure, and an optical band gap that decreased from 3.61 to 3.48 eV on increase in film thickness (in the range 500–1000 nm). On oxidative voltammetric cycling in aqueous KOH (0.1 mol dm–3) electrolyte, the morphology gradually changed to an open porous NiO structure. The electrochromic properties of the films were investigated as a function of film thickness, following 50, 100, and 500 conditioning oxidative voltammetric cycles in aqueous KOH (0.1 mol dm–3). Light modulation of the films increased with the number of conditioning cycles. The maximum coloration efficiency (CE) for the NiO (transmissive light green, the “bleached” state) to NiOOH (deep brown, the colored state) electrochromic process was found to be 56.3 cm2 C–1 (at 450 nm) for films prepared by AACVD for 15 min followed by 100 “bleached”-to-colored conditioning oxidative voltammetric cycles. Electrochromic response times were <10 s and generally longer for the coloration than the bleaching process. The films showed good stability when tested for up to 10 000 color/bleach cycles. Using the CIE (Commission Internationale de l’Eclairage) system of colorimetry the color stimuli of the electrochromic NiO films and the changes that take place on reversibly oxidatively switching to the NiOOH form were calculated from in situ visible spectra recorded under electrochemical control. Reversible changes in the hue and saturation occur on oxidation of the NiO (transmissive light green) form to the NiOOH (deep brown) form, as shown by the track of the CIE 1931 xy chromaticity coordinates. As the NiO film is oxidized, a sharp decrease in luminance was observed. CIELAB L*a*b* coordinates were also used to quantify the electrochromic color states. A combination of a low L* and positive a* and b* values quantified the perceived deep brown colored state.

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Section: Introductionmentioning

confidence: 99%

Electrochromic and Colorimetric Properties of Nickel(II) Oxide Thin Films Prepared by Aerosol-Assisted Chemical Vapor Deposition

Sialvi

Mortimer

Wilcox

et al. 2013

ACS Appl. Mater. Interfaces

112

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“…Some previous studies on the sputter deposition of Ni(OH) 2 and hydrated NiO thin films are summarized in Table I. [15][16][17][18][19][20][21][22][23][24] In these studies, a Ni(OH) 2 target was sputtered in an Ar + O 2 atmosphere, or Ni metal targets were reactively sputtered in reactive gasses containing O 2 + H 2 or H 2 O. Substrate cooling below (RT, around 20 °C) was applied in some studies. Although these papers reported good EC properties for the deposited films, the Ni(OH) 2 thin film formation was not fully confirmed.…”

Section: Introductionmentioning

confidence: 99%

Reactive sputter deposition of β-Ni(OH)₂ thin films in Ar + H₂O mixed gas atmosphere at a substrate temperature of −80 °C

Abe

Kataoka

Yokoiwa

et al. 2023

Jpn. J. Appl. Phys.

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Nickel hydroxide [Ni(OH)2] is an electrochemically-active material used for rechargeable batteries, electrochemical capacitors, and electrochromic devices. Although there have been some studies on nickel hydroxide thin films deposited by sputtering, the Ni(OH)2 formation has not been fully confirmed. In this study, a Ni metal target was reactively sputtered in atmospheres of O2 and Ar + H2O at substrate temperatures of room temperature (RT, around 20 °C), −80 °C, and −170 °C, and the aging treatment effects in the air at RT were studied. From optical, X-ray diffraction, and infrared absorption measurements, β-Ni(OH)2 thin films were found to be formed after aging the films deposited at −80 °C in Ar + H2O, however, NiO thin films were formed at RT. These results corresponded well with a thermodynamic consideration of Ni(OH)2. At −170 °C, mixed metal and oxide films were formed, presumably because of insufficient Ni oxidation.

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“…compostos da família do α-Ni(OH)2, entre os quais é difícil de se distinguir entre os hidróxidos hidratados e hidróxi-sais.Porém, independentemente do método de síntese, o α-Ni(OH)2 é termodinamicamente instável, de modo que quando estocado em contato com solução de KOH (envelhecimento), ou durante processos sucessivos de carga e descarga eletroquímica, o material vai se transformando em β-Ni(OH)2 até eventualmente se converter completamente neste material.1.4.3 Principais AplicaçõesO hidróxido de níquel (Ni(OH)2) e os óxidos hidratados não estequiométricos de níquel (NiOxHy) têm sido objeto de um grande número de estudos devido a sua ampla variedade de aplicações, tais como precursores na preparação de óxido de níquel (NiO)71,91,92 , catalisadores93,94 em sensores e na preparação de ânodos de baterias[95][96][97] .Além disso, filmes de óxidos/hidróxidos de níquel mudam de cor em função do estado de oxidação, passando de praticamente incolor no estado reduzido à ao marrom escuro no estado oxidado. São, portanto úteis para aplicações em dispositivos eletrocrômicos, tais como "janelas inteligentes", espelhos retrovisores e óculos de sol eletrocrômicos[98][99][100][101] . O mecanismo responsável pelo eletrocromismo e pelas propriedades eletroquímicas do óxido/hidróxido de níquel em um eletrólito aquoso ainda não é totalmente compreendido, mas tem sido associado ao processo 1.0 Introdução…”

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Síntese e propriedades de nanomateriais baseados em hidróxido de níquel obtidos pelo método sol-gel

Rocha¹

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frente a missão de proporcionar amor desmedido, apoio, compreensão e carinho sempre e nas mais diversas situações e acima de tudo, são exemplos de vida, perseverança, caráter, dignidade e humanidade, meus Pais meus Pais meus Pais meus Pais: Gilson C. S. Rocha e Rosângela F. V. Rocha. Obrigado por acreditarem em meus sonhos. Ao meu irmão meu irmão meu irmão meu irmão, Isaac Rocha, que me surpreende a cada dia, me faz tão feliz por sua existência e me mostra que esforço, dedicação e autenticidade podem nos levar para onde quisermos. Sou sua Fã! minha grande amiga Evelize Vasco, cuja força me inspira. Akiko Sato Matsumoto, por todo apoio, preocupação e carinho. o Marcio, por compartilhar todos estes anos difíceis e com grande amor ter me dado suporte, a cada dia, a cada momento. Com certeza, você faz a grande diferença não só neste trabalho, mas em minha vida toda! o Prof. Dr. Koiti Araki pelo incentivo, confiança e amizade! D À À A A AGRADECIMENTOS À Deus, por me permitir estar aqui e sempre guiar meus passos. Ao Prof. Dr. Koiti Araki pela acolhida no grupo LQSN, pela orientação, amizade, paciência e acima de tudo, pela compreensão durante todo este tempo. Ao Prof. Dr. Henrique E. Toma pelas discussões e pelo apoio sempre encorajador. Ao Prof. Dr. Fauze J. Anaissi por ter acreditado que eu poderia ir mais longe.

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Electrochromism of NiOxH y films grown by DC sputtering

Cited by 10 publications

References 13 publications

Electrochromic and Colorimetric Properties of Nickel(II) Oxide Thin Films Prepared by Aerosol-Assisted Chemical Vapor Deposition

Electrochromic and Colorimetric Properties of Nickel(II) Oxide Thin Films Prepared by Aerosol-Assisted Chemical Vapor Deposition

Reactive sputter deposition of β-Ni(OH)₂ thin films in Ar + H₂O mixed gas atmosphere at a substrate temperature of −80 °C

Síntese e propriedades de nanomateriais baseados em hidróxido de níquel obtidos pelo método sol-gel

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Electrochromism of NiOxH y films grown by DC sputtering

Cited by 10 publications

References 13 publications

Electrochromic and Colorimetric Properties of Nickel(II) Oxide Thin Films Prepared by Aerosol-Assisted Chemical Vapor Deposition

Electrochromic and Colorimetric Properties of Nickel(II) Oxide Thin Films Prepared by Aerosol-Assisted Chemical Vapor Deposition

Reactive sputter deposition of β-Ni(OH)2 thin films in Ar + H2O mixed gas atmosphere at a substrate temperature of −80 °C

Síntese e propriedades de nanomateriais baseados em hidróxido de níquel obtidos pelo método sol-gel

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Reactive sputter deposition of β-Ni(OH)₂ thin films in Ar + H₂O mixed gas atmosphere at a substrate temperature of −80 °C