Insights on the electrodeposition mechanism of tungsten oxide into conducting polymers: Potentiostatic vs. potentiodynamic deposition

Zhuzhel’skii, D. V.; Tolstopyatova, E. G.; Volkov, A. I.; Eliseeva, Svetlana N.; Ланг, Г.; Kondratiev, V. V.

doi:10.1016/j.synthmet.2020.116469

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…This is most likely caused by different mechanisms of electrodeposition of tungsten oxide on an FTO electrode and a PEDOT-covered FTO electrode. The difference was clearly observed before in a systematic investigation of electrodeposition conditions and their effects on the electrochemical response of tungsten oxide-covered FTO electrode and reported recently [36]. As shown, the potentiodynamic method of electrodeposition may result in trapping of polyoxotungstate anion species into the polymer during p-doping of the polymer and may thus facilitate preliminary formation of precursors of tungsten oxide nanostructures.…”

Section: Discussionmentioning

confidence: 66%

Interactions in Electrodeposited Poly-3,4-Ethylenedioxythiophene—Tungsten Oxide Composite Films Studied with Spectroelectrochemistry

et al. 2021

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Cyclic voltammograms and optical absorption spectra of PEDOT/WO3 composite films were recorded in order to identify possible interactions and modes of improved performance of the composite as compared to the single materials. Changes in the shape of redox peaks related to the W(VI)/W(V) couple in the CVs of WO3 and the composite PEDOT/WO3 films indicate electrostatic interactions between the negatively charged tungsten oxide species and the positively charged conducting polymer. Smaller peak separation suggests a more reversible redox process due to the presence of the conducting polymer matrix, accelerating electron transfer between tungsten ions. Electronic absorption spectra of the materials were analyzed with respect to changes of the shapes of the spectra and characteristic band positions. There are no noticeable changes in the position of the electronic absorption bands of the main chromophores in the electronic spectra of the composite film. Obviously, the interactions accelerating the redox performance do not show up in the optical spectra. This suggests that the existing electrostatic interactions in the composite do not significantly change the opto-electronic properties of components of the composite but resulted in the redistribution of fractions of polaron and bipolaron forms in the polymer.

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Section: Discussionmentioning

confidence: 66%

Interactions in Electrodeposited Poly-3,4-Ethylenedioxythiophene—Tungsten Oxide Composite Films Studied with Spectroelectrochemistry

et al. 2021

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“…Tungsten oxide (WO 3 ) is considered as one of the most promising transition metal oxides, for their performance in various applications, including electrochromic devices [ 1 , 2 ], dye-sensitized solar cells [ 3 , 4 ], photocatalytic applications [ 5 ], sensing applications [ 6 , 7 ], field-emission applications [ 8 ], high-temperature superconductors [ 9 ], optical recording devices [ 10 ], and adsorbent [ 11 ]. The wide application for WO 3 could be attributed to its high chemical stability and remarkable electric conductivity in addition to the ability in the reverse-redox process [ 12 ]. Moreover, tungsten oxide could be prepared in different morphological structures, including nanorods [ 13 ], nanotubes [ 14 ], nanosheets [ 7 ], nanowires [ 15 ], and nanobelts [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…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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“…Tungsten oxide (WO 3 ) is considered as one of the most promising transition metal oxides, for their regard performance in various applications including electrochromic devices 1,2 , dye-sensitized solar cells 3,4 , photocatalytic applications 5 , sensing applications 6,7 , eld-emission applications 8 , high-temperature superconductors 9 , optical recording devices 10 and adsorbent 11 . The wide application for WO 3 could be attributed to its high chemical stability and remarkable electric conductivity in addition to the ability to reverse-redox process 12 . Moreover, tungsten oxide could be prepared in different morphologies involved: nanorods 13 , nanotubes 14 , nanosheets 7 , nanowires 15 , and nanobelts 16 .…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, tungsten oxide could be prepared in different morphologies involved: 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 , templating method 20 , hydrothermal 13 , electrochemical anodization 21 , electrodeposition 12 , microwave-assisted method 5 . however, these methods are timeconsuming, and relatively complicated processes with a limitation in controlling the size and shape of the resulted nanoparticles 5,22 .…”

Section: Introductionmentioning

confidence: 99%

Novel Nanocombinations of L-tryptophan and L-cysteine: Preparation, Characterization and Their Applications for Dye Decolorization, Antimicrobial and Anticancer Activities

Abd-Elhamid

El‐Gendi

Abdallah

et al. 2021

Preprint

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Tungsten oxide WO3 nanoparticles (NPs) were prepared in a form of nanosheets with a homogeneous size and dimensions in one step through acid precipitation using a cation exchange column. The resulting WO3 nanosheets surface was decorated with one of the two amino acids (AAs) L-tryptophan (Trp) or L-cysteine (Cys) 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 NPs and WO3-Trp NPs revealed higher broad-spectrum antibacterial activity toward both G-ve and G+ve 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 indicated 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, 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 evidently up-regulated after treatment by more than 5-8 folds as compared to untreated cells. The docking results confirmed the ability of both NPs to bind to 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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Insights on the electrodeposition mechanism of tungsten oxide into conducting polymers: Potentiostatic vs. potentiodynamic deposition

Cited by 5 publications

References 23 publications

Interactions in Electrodeposited Poly-3,4-Ethylenedioxythiophene—Tungsten Oxide Composite Films Studied with Spectroelectrochemistry

Interactions in Electrodeposited Poly-3,4-Ethylenedioxythiophene—Tungsten Oxide Composite Films Studied with Spectroelectrochemistry

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

Novel Nanocombinations of L-tryptophan and L-cysteine: Preparation, Characterization and Their Applications for Dye Decolorization, Antimicrobial and Anticancer Activities

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