Multifaceted tungsten oxide films grown by thermal evaporation

Garcia, Irene Teresinha Santos; Corrêa, Diogo Silva; Moura, Diego Soares de; Pazinato, Julia Cristina Oliveira; Pereira, Marcelo Barbalho; Costa, Nadja B.D. da

doi:10.1016/j.surfcoat.2015.10.053

Cited by 25 publications

(4 citation statements)

References 46 publications

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“…There are various physical and chemical methods to prepare NiO films: hydrothermal method, sonochemical method, sol–gel method, thermal decomposition method, chemical vapor deposition method, magnetron sputtering method, precipitation method, etc. − Among them, the sample synthesized by the hydrothermal synthesis method has the advantages of high purity, almost no pollution, fine particles, and controllable morphology, and it does not require expensive equipment. It has also been reported that the two-dimensional porous structure can significantly improve electrochemical performance and electrochromic performance …”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Porous Structure of V-Doped NiO with Enhanced Electrochromic Properties

Zhan¹,

Gao

Zhuang³

et al. 2022

ACS Omega

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In this work, a two-dimensional porous structure of a V-doped NiO film with excellent electrochromic properties on an ITO substrate was synthesized by a hydrothermal method. The influence of V5+ ions on the NiO film was explored by adjusting the amount of V doping, including refining the crystal grains, increasing the specific surface area of the film, and accelerating the diffusion rate of OH– in the film. Compared with the undoped NiO film, a 3 atom % V-doped NiO film comes out with superior electrochromic properties with large optical transmittance modulation (81.9% at 600 nm), fast response times (1.2 and 0.9 s), and excellent cycle stability (90.6%). This work creates innovation direction in the field of intelligent energy-saving window materials with high electrochromic properties.

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Section: Introductionmentioning

confidence: 99%

Two-Dimensional Porous Structure of V-Doped NiO with Enhanced Electrochromic Properties

Zhan¹,

Gao

Zhuang³

et al. 2022

ACS Omega

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“…Z; PATROCINIO, A. O. T., 2022). These oxides present several stoichiometries, crystal structures and morphologies and can be synthetized by different processes such anodization (DA COSTA et al, 2021;DA COSTA et al, 2015), electrodeposition (GURCUOGLU; EVECAN; ZAYIM, 2015), chemical vapor deposition (NAVIO et al, 2012), physical vapor deposition (GARCIA et al, 2015), hydrothermal (YANG et al, 2012) and sol-gel (DE MOURA et al, 2018;PAZINATO et al, 2019) methods.…”

Section: Introductionmentioning

confidence: 99%

Sodium tetratungstate/tungsten oxide films prepared with dodecyltrimethylammonium chloride as structuring agent

Garcia

Moura

2022

R. Eletr. Cient. da Uergs

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Abstract The multiple forms of structuring transition metal anions in solution are important aspects to be taken into account in obtaining oxides of these metals by the sol-gel method. The formation of polyanions in aqueous media can produce a variety of structures in the solid state. Films were obtained through sol-gel method with sodium tungstate as precursor and dodecyltrimethylammonium chloride (DTAC) as structuring agent, after calcined at 700 °C in air. The films, structured as nanospheres, were composed mainly of triclinic sodium tetratungstate and monoclinic tungsten oxide. The cationic surfactant interacts in aqueous media with the precursor, affecting the obtained films' final morphology, without affecting their crystal structure. Their photocatalytic properties were also evaluated. Keywords: Colloidal synthesis; sol-gel; photocatalysis. Resumo Filmes de tetratungstato de sódio/óxido de tungstênio preparados com cloreto de dodeciltrimetilamônio como agente estruturante As múltiplas formas de estruturação de ânions de metais de transição em solução revelam aspectos importantes a ser levados em consideração na obtenção de seus óxidos pelo método sol-gel. Um desses aspectos é a formação de poliânions em meio aquoso, que pode produzir uma variedade de estruturas no estado sólido. Desta feita, foram obtidos filmes através do método sol-gel utilizando-se, como precursor, de tungstato de sódio e, como agente estruturante, cloreto de dodeciltrimetil amônio, que foram posteriormente calcinados a 700 ºC em ar. Observou-se que os filmes, estruturados como nano esferas, eram compostos principalmente de tetratungstato de sódio triclínico e óxido de tungstênio monoclínico. Por sua vez, conclui-se que o surfactante catiônico interage em meio aquoso com o precursor e afeta a morfologia final dos filmes obtidos, no entanto tem pouca influência nas suas estruturas cristalinas. Faz-se importante destacar que as propriedades fotocatalíticas foram também avaliadas na presente pesquisa. Palavras-chave: Síntese coloidal; sol-gel; fotocatálise. Resumen Películas de tetratungstato de sodio/óxido de tungsteno preparadas con cloruro de dodeciltrimetilamonio como agente estructurante Las múltiples formas de estructurar los aniones de metales de transición en solución son aspectos importantes a tener en cuenta a la hora de obtener sus óxidos por el método sol-gel. La formación de polianiones en medios acuosos puede producir una variedad de estructuras en estado sólido. Se produjeron películas por medio del método sol-gel utilizando tungstato de sodio como precursor y cloruro de dodeciltrimetilamonio como agente estructurante, luego calcinadas a 700 ºC en aire. Las películas, estructuradas como nanoesferas, estaban compuestas principalmente de tetratungstato de sodio triclínico y óxido de tungsteno monoclínico. El tensioactivo catiónico interactúa en medio acuoso con el precursor, afectando la morfología final de las películas obtenidas, pero tiene poca influencia sobre su estructura cristalina. Fueron evaluadas también las propiedades fotocatalíticas. Palabras clave: Síntesis coloidal; sol-gel; fotocatálisis.

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“…Moreover, tungsten oxide could be prepared in different morphological structures, including nanorods [ 13 ], nanotubes [ 14 ], nanosheets [ 7 ], nanowires [ 15 ], and nanobelts [ 16 ]. Several techniques were investigated for the preparation of WO 3 using either physical or chemical approaches; thermal evaporation [ 17 ], spray pyrolysis [ 18 ], sol–gels [ 19 ], the templating method [ 20 ], hydrothermal [ 13 ], electrochemical anodization [ 21 ], electrodeposition [ 12 ], and the microwave-assisted method [ 5 ].However, these methods are time-consuming, and relatively complicated processes with a limitation in controlling the size and shape of the resulted nanoparticles [ 5 , 22 ]. One of the simplest and cost-effective methods for preparing tungsten trioxide nanoparticles is acid precipitation [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Nanocombinations of l-Tryptophan and l-Cysteine: Preparation, Characterization, and Their Applications for Antimicrobial and Anticancer Activities

et al. 2021

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Tungsten oxide WO3 nanoparticles (NPs) were prepared in a form of nanosheets with homogeneous size and dimensions in one step through acid precipitation using a cation exchange column. The resulting WO3nanosheet surface was decorated with one of the two amino acids (AAs) l-tryptophan (Trp) or l-cysteine (Cys) and evaluated for their dye removal, antimicrobial, and antitumor activities. A noticeable improvement in the biological activity of WO3 NPs was detected upon amino acid modification compared to the original WO3. The prepared WO3-Trp and WO3-Cys exhibited strong dye removal activity toward methylene blue and safranin dyes with complete dye removal (100%) after 6 h. WO3-Cys and WO3-Trp NPs revealed higher broad-spectrum antibacterial activity toward both Gram-negative and Gram-positive bacteria, with strong antifungal activity toward Candida albicans. Anticancer results of the modified WO3-Cys and WO3-Trp NPs against various kinds of cancer cells, including MCF-7, Caco-2, and HepG-2 cells, indicate that they have a potent effect in a dose-dependent manner with high selectivity to cancer cells and safety against normal cells. The expression levels of E2F2 and Bcl-2 genes were found to be suppressed after treatment with both WO3-Cys and WO3-Trp NPs more than 5-FU-treated cells. While expression level of the p53 gene in all tested cells was up-regulated after treatment 5–8 folds more as compared to untreated cells. The docking results confirmed the ability of both NPs to bind to the p53 gene with relevant potency in binding to other tested gens and participation of cysteine SH-functional group in such interaction.

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Multifaceted tungsten oxide films grown by thermal evaporation

Cited by 25 publications

References 46 publications

Two-Dimensional Porous Structure of V-Doped NiO with Enhanced Electrochromic Properties

Two-Dimensional Porous Structure of V-Doped NiO with Enhanced Electrochromic Properties

Sodium tetratungstate/tungsten oxide films prepared with dodecyltrimethylammonium chloride as structuring agent

Novel Nanocombinations of l-Tryptophan and l-Cysteine: Preparation, Characterization, and Their Applications for Antimicrobial and Anticancer Activities

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