Nitrogen Doping of Graphite Oxide with 2,3‐Diaminomaleonitrile: A Study of the Structural, Morphological, and Electrochemical Behavior

Chávez-Esquivel, Gerardo; Cervantes‐Cuevas, Humberto; Gasca, Martha de la O; Acosta, Dwight

doi:10.1002/pssb.202100634

Cited by 4 publications

(3 citation statements)

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“…This space can vary depending on the oxidation degree. [ 30 ] Graphite‐strong oxidation with KMnO 4 and HClO 4 produces structural defects in the final material. [ 32 ] Additionally, doping with Cu(NO 3 ) 2 and/or CuSO 4 salts promotes oxidation and the new functional groups formation, which can increase the interplanar distance.…”

Section: Resultsmentioning

confidence: 99%

“…[28,29] Subsequently, GrO was doped with 1.5 wt% Cu(NO 3 ) 2 (CuN/GrO) and 1.5 wt% CuSO 4 (CuS/GrO) by incipient impregnation and heated at 180 °C for 3 h. The characterization equipment and operating conditions of each technique used in the characterization of Cu/GrO composites are described in previous work. [29,30]…”

Section: Cu/gro Composites Synthesis and Characterizationmentioning

confidence: 99%

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Copper Precursor Salt‐Dependent Antimicrobial Activity of Graphite Oxide Composites Against Escherichia coli and Staphylococcus Aureus: Synthesis and Characterization

Chavez-Esquivel,

Cervantes-Cuevas,

Becerril-Samaniego

et al. 2024

Physica Status Solidi (a)

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Graphite oxide (GrO) and GrO doped with 1.5 wt% Cu(NO3)2 (CuN/GrO) and 1.5 wt% CuSO4 (CuS/GrO) were synthesized by the Hummers and incipient impregnation methods, respectively. Face‐center cubic Cu, monoclinic CuO, and cubic Cu2O mixed crystalline phases were observed in CuN/GrO and CuS/GrO composites. In particular, CuSO4‐doped GrO composite showed higher relative crystallinity compared to Cu(NO3)2‐doped GrO composite. The ID/IG ratio on average was 1.0 for all composites, associated with similar structural disorders and defects. CuN/GrO and CuS/GrO composites increased the C: O ratio by 30% compared to GrO. In Cu(NO3)2‐doped and CuSO4‐doped GrO composites, the copper particle dispersion was on the GrO surface and GrO edges, respectively. By agar‐well diffusion assay, the CuN/GrO composite presented only inhibition against the Staphylococcus aureus microorganism at 10 mg mL‐1 per well. However, using the CuS/GrO composite, the minimum inhibitory concentration was 5 mg mL‐1 per well against Escherichia coli and S. aureus microorganisms. In general, the copper precursor salt influenced the copper particle localization in the GrO matrix in a different way, modulating the antimicrobial behavior. In this way, it is possible to establish a possible electrostatic adsorption caused by the Cu+ or Cu2+ ions and the negative charges of the bacterial cell membrane, where the adsorption and mass diffusion mechanisms between charged composites and Gram‐positive and Gram‐negative microorganisms were affected by the copper particle arrangement in the composites.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Section: Cu/gro Composites Synthesis and Characterizationmentioning

confidence: 99%

Copper Precursor Salt‐Dependent Antimicrobial Activity of Graphite Oxide Composites Against Escherichia coli and Staphylococcus Aureus: Synthesis and Characterization

Chavez-Esquivel,

Cervantes-Cuevas,

Becerril-Samaniego

et al. 2024

Physica Status Solidi (a)

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“…The characterization equipment and operating conditions of each technique used for the characterization of silver-doped graphite oxide composites have been described in previous works [19,21,32].…”

Section: Composites Characterizationmentioning

confidence: 99%

Silver-doped graphite oxide composites used as antimicrobial agents against Staphylococcus aureus, Escherichia coli and Tatumella terrea evaluated by direct TLC bioautography

Chavez-Esquivel,

Cervantes-Cuevas,

Cortes-Cordova

et al. 2024

Nano Ex.

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Silver-doped graphite oxide composites presented mixed Ag and Ag2O crystalline phases accompanied by C/O and ID/IG average ratios of 2.13 and 1.16, associated with a good oxidation degree and high structural disorder or defects in the carbon material, respectively. The low-silver-doped GrO composite showed homogenous silver particle dispersion and a low particle size distribution (96 nm). However, high-silver-doped GrO composites generated materials with high relative crystallinity, silver particle agglomeration, and Ag metal phase promotion. At 3 and 5 mg ml-1 per chromatographic plate, the silver-doped graphite oxide composites were tested by direct TLC bioautography against Staphylococcus aureus, Escherichia coli, and Tatumella terrea microorganisms, where the minimum inhibitory concentration was 3 mg ml-1 per chromatographic plate. At 3.0 mg ml-1 per chromatographic plate, high-silver-doped GrO composite exhibited a 39%, 3.2-fold, and 83% higher retention factor (Rf) compared with the composite with low-silver-doped GrO composite against S. aureus, E. coli, and T. terra microorganisms, respectively. However, both composites showed similar inhibition capacities at 5.0 mg ml-1 per chromatographic plate against the three microorganisms. This behavior may be associated with both composites reaching the threshold limit. In general, the amount of silver acetate used in the silver-doped GrO composites influenced the dispersion, crystalline phase promotion, particle size distribution, and release capacity of the silver particles, which modified the type of electrostatic adsorption between the composites and the bacterial cell walls.

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Synthesis and Characterization of Graphene-Doped Co3O4 Nanotubes Electrode Material for Supercapacitor Application

Salamon,

Simi,

Prabu

et al. 2024

J Inorg Organomet Polym

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Nitrogen Doping of Graphite Oxide with 2,3‐Diaminomaleonitrile: A Study of the Structural, Morphological, and Electrochemical Behavior

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/pssb.202100634.

Cited by 4 publications

References 84 publications

Copper Precursor Salt‐Dependent Antimicrobial Activity of Graphite Oxide Composites Against Escherichia coli and Staphylococcus Aureus: Synthesis and Characterization

Copper Precursor Salt‐Dependent Antimicrobial Activity of Graphite Oxide Composites Against Escherichia coli and Staphylococcus Aureus: Synthesis and Characterization

Silver-doped graphite oxide composites used as antimicrobial agents against Staphylococcus aureus, Escherichia coli and Tatumella terrea evaluated by direct TLC bioautography

Synthesis and Characterization of Graphene-Doped Co3O4 Nanotubes Electrode Material for Supercapacitor Application

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