Enhancing hydrothermal formation of α-MnO2 nanoneedles over nanographite structures obtained by electrochemical exfoliation

Marciniuk, Gustavo; Ferreira, Rodolfo Thiago; Pedroso, Alex V.; Ribas, Ariane S; Ribeiro, Rosane Aparecida; Lázaro, Sérgio Ricardo de; Souza, Éder Carlos Ferreira de; Marchesi, Luís F.; Garcia, Jarem Raul

doi:10.1007/s12034-020-02336-8

Cited by 11 publications

(3 citation statements)

References 79 publications

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“…The peaks at 215 and 284 represent Fe 3 O 4 , 15 and the peak at 642 represents MnO 2 . 16 17 The peaks at 1379 and 1578 cm −1 correspond to the oxidized PPy ring stretching mode and the C=C backbone stretching mode of PPy, respectively. I-V characteristic.-Figure 5 displays the current vs voltages of PPy-PANI-GO-MWCNTs composite/MnO 2 /Fe 3 O 4 /n-Si structure at selected temperatures.…”

Section: Resultsmentioning

confidence: 99%

Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO₂/Fe₃O₄/n-Si Structure

Ashery¹,

Maged²

2022

ECS J. Solid State Sci. Technol.

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Conducting polymer-nanocomposite has potential applications in optoelectronic devices. This paper presents a novel composite consisting of polypyrrole (PPy), polyaniline (PANI), graphene oxide (GO), and multiwall carbon nanotube (MWCNTs) deposited on MnO2/Fe3O4/n-Si structure, resulting in a structure that is PPy-PANI-GO-MWCNTs composite/MnO2/Fe3O4/n-Si. This structure is investigated by scanning electron microscope, X-Ray diffraction, and Raman spectroscopy. PPy-PANI-GO-MWCNTs composite/MnO2/Fe3O4 /n-Si structure is used in manufacturing electronic devices like diodes, which have tunneling behavior at low voltage, though at voltage more than the voltage (V)= 0.5 V, the diode behavior as an ordinary diode. PPy-PANI-GO-MWCNTs composite/MnO2/Fe3O4/n-Si structure has a very high conductance reach of (S), and capacitance reaches -11 F. The electrical and dielectrically properties of this structure PPy-PANI-GO-MWCNTs compositeMnO2/Fe3O4/n-Si were done.

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Section: Resultsmentioning

confidence: 99%

Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO₂/Fe₃O₄/n-Si Structure

Ashery¹,

Maged²

2022

ECS J. Solid State Sci. Technol.

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“…VO 2 (B) has a stable tunneling structure . However, the structural stability and specific capacitance of VO 2 are slightly insufficient compared with other transition metal oxides such as Co 3 O 4 , NiO, and MnO 2 . , Therefore, the structural stability and specific capacitance improvement of VO 2 electrode materials are key to its application in SCs. Pan et al reported that the resistivity of VO 2 electrode materials can be reduced by nearly 3 orders of magnitude by H 2 treatment .…”

Section: Research and Development Status Of Vanadium Oxide-based Elec...mentioning

confidence: 99%

Vanadium Oxide-Based Electrode Materials for Advanced Supercapacitors: A Review

Ma,

Han,

Liu

et al. 2024

Energy Fuels

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In the direction of novel energy materials, one area of intense research focus is creating new electrode materials to enhance the electrochemical performance of supercapacitors. Compared to other metal elements, vanadium has numerous valence states (+2 to +5). Materials based on vanadium oxide will show various electrochemical characteristics, which makes choosing the electrode material for a supercapacitor quite convenient. They still have a lot of room to increase the electrochemical performance of their electrode materials, which might be very useful in large-scale commercial supercapacitor applications. This review focuses on effective ways of improving the electrochemical performance of metal-and vanadium oxide-based electrode materials. To develop unique structures with more REDOX active sites, various synthesis approaches have been used, including carbon-based composites and the addition of transition metal cations. Future prospects and difficulties are addressed along with existing research approaches to clarify how advances in these materials can improve the use of supercapacitors.

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“…The various structures, corresponding to different chemical and physical properties, have been widely applied in catalysis, batteries, sensors, molecular sieves, energy storage, etc. ( Dawadi et al, 2020 ; Ye et al, 2020 ; Marciniuk et al, 2021 ; Ouyang et al, 2021 ; Wang et al, 2021 ). Particularly, δ-MnO 2 has attracted considerable attention due to its unique layered structure, where its bandgap can be tuned by filling ions between the layers ( Luo et al, 2000 ; Wang et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Spontaneous Antibacterial Activity of δ-MnO2 by Alkali Metals Doping

Yan

Jiang

Liu

et al. 2022

Front. Bioeng. Biotechnol.

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Recently, the widespread use of antibiotics is becoming a serious worldwide public health challenge, which causes antimicrobial resistance and the occurrence of superbugs. In this context, MnO2 has been proposed as an alternative approach to achieve target antibacterial properties on Streptococcus mutans (S. mutans). This requires a further understanding on how to control and optimize antibacterial properties in these systems. We address this challenge by synthesizing δ-MnO2 nanoflowers doped by magnesium (Mg), sodium (Na), and potassium (K) ions, thus displaying different bandgaps, to evaluate the effect of doping on the bacterial viability of S. mutans. All these samples demonstrated antibacterial activity from the spontaneous generation of reactive oxygen species (ROS) without external illumination, where doped MnO2 can provide free electrons to induce the production of ROS, resulting in the antibacterial activity. Furthermore, it was observed that δ-MnO2 with narrower bandgap displayed a superior ability to inhibit bacteria. The enhancement is mainly attributed to the higher doping levels, which provided more free electrons to generate ROS for antibacterial effects. Moreover, we found that δ-MnO2 was attractive for in vivo applications, because it could nearly be degraded into Mn ions completely following the gradual addition of vitamin C. We believe that our results may provide meaningful insights for the design of inorganic antibacterial nanomaterials.

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Enhancing hydrothermal formation of α-MnO2 nanoneedles over nanographite structures obtained by electrochemical exfoliation

Cited by 11 publications

References 79 publications

Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO₂/Fe₃O₄/n-Si Structure

Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO₂/Fe₃O₄/n-Si Structure

Vanadium Oxide-Based Electrode Materials for Advanced Supercapacitors: A Review

Enhanced Spontaneous Antibacterial Activity of δ-MnO2 by Alkali Metals Doping

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Enhancing hydrothermal formation of α-MnO2 nanoneedles over nanographite structures obtained by electrochemical exfoliation

Cited by 11 publications

References 79 publications

Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO2/Fe3O4/n-Si Structure

Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO2/Fe3O4/n-Si Structure

Vanadium Oxide-Based Electrode Materials for Advanced Supercapacitors: A Review

Enhanced Spontaneous Antibacterial Activity of δ-MnO2 by Alkali Metals Doping

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Product

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Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO₂/Fe₃O₄/n-Si Structure

Novel Structure, Electric and Dielectric Properties of PPy-PANI-GO-MWCNTs Composite/MnO₂/Fe₃O₄/n-Si Structure