Synthesis and antibacterial activity of nanoenhanced conjugate of Ag-doped ZnO nanorods with graphene oxide

Khan, Afroz; Kamal, Tausif; Saad, Md.; Ameen, Fuad; Bhat, Sartaj Ahmad; Khan, Mo Ahamad; Rahman, F.

doi:10.1016/j.saa.2022.122296

Cited by 46 publications

(11 citation statements)

References 55 publications

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“…As shown in Figure 3, a strong absorption peak is observed at 418 nm, which is the characteristic of AgNPs. The direct energy band gap of the biogenic AgNPs was calculated by extrapolating the Tauc's plot 34 in the linear region and found to be 2.58 eV, as shown in the inset of Figure 3. The Tauc's plot for the direct energy band gap was plotted using the equation as shown below (Equation 3)

\alpha h\nu =B{\left( h\nu -{E}_g\right)}^{1/2}

where B is energy independent coefficient,

h\nu

is energy,

{E}_g

is the energy band gap, and

\alpha

is the absorption coefficient determined using the following equation (Equation 4)

\alpha =\frac{2.303\times A}{t}

where A is the absorbance and t is the thickness (10 mm) of quartz cuvette.…”

Section: Resultsmentioning

confidence: 99%

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Biogenic synthesis of Psidium guajava‐mediated silver nanoparticles: A comprehensive antibiofilm and antivirulence study

Chmagh,

Alown,

Khan

et al. 2024

Polymers for Advanced Techs

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In this study, at sub‐MIC, the efficacy of green synthesized Psidium guajava‐mediated silver nanoparticles (Pg@AgNPs) in inhibiting quorum sensing facilitated virulence factors and suppressing biofilm formation was evaluated against clinical multidrug resistant (MDR) isolates, specifically Chromobacterium violaceum MCC‐2290 and Pseudomonas aeruginosa PAO1. The AgNPs were synthesized by adding the leaf extract to a solution of silver nitrate, and the reduction of Ag+ ions to Ag0 was confirmed by the appearance of brown color. The Pg@AgNPs were characterized using Fourier transform infrared (FTIR), UV/Vis spectroscopy, TEM, and XRD. The UV/Vis spectrum showed the characteristic absorption peak of Pg@AgNPs in the range of 350–480 nm. FTIR analysis substantiated the existence of functional groups implicated in the synthesis and stabilization of AgNPs. The XRD analysis elucidated the crystalline characteristics of the nanoparticles. The TEM images further confirmed the spherical shape and size of the nanoparticles, which ranged between 5 and 25 nm. The AgNPs demonstrated notable antibacterial efficacy against C. violaceum and P. aeruginosa. Moreover, the Pg@AgNPs effectively suppressed both biofilm formation and the production of quorum sensing‐mediated virulence factors such as pyoverdin (77.2%), pyocyanin (78.12%), and violacein (83.4%). Additionally, the Pg@AgNPs demonstrated broad‐spectrum activity against biofilm formation, showing the biofilm inhibition in C. violaceum and P. aeruginosa by 81.86% and 87.89%, respectively. Under light microscopy, it is also observed that Pg@AgNPs reduce the formation of biofilm in both tested bacteria. The present finding highlights the potential of green‐synthesized AgNPs using P. guajava leaf extract as antimicrobial agents with potential applications in combating bacterial infections and biofilm‐related diseases.

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\alpha h\nu =B{\left( h\nu -{E}_g\right)}^{1/2}

where B is energy independent coefficient,

h\nu

is energy,

{E}_g

is the energy band gap, and

\alpha

is the absorption coefficient determined using the following equation (Equation 4)

\alpha =\frac{2.303\times A}{t}

where A is the absorbance and t is the thickness (10 mm) of quartz cuvette.…”

Section: Resultsmentioning

confidence: 99%

“…In the FTIR spectrum as represented in Figure 2 extrapolating the Tauc's plot 34 in the linear region and found to be 2.58 eV, as shown in the inset of Figure 3. The Tauc's plot for the direct energy band gap was plotted using the equation as shown below (Equation 3)…”

Section: Ftir Analysismentioning

confidence: 90%

Biogenic synthesis of Psidium guajava‐mediated silver nanoparticles: A comprehensive antibiofilm and antivirulence study

Chmagh,

Alown,

Khan

et al. 2024

Polymers for Advanced Techs

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“…A widespread technique for determining the optical bandgap of GO is the Tauc method ( Gul et al, 2023 ; Khan et al, 2023 ). This technique makes use of the Tauc analysis and the absorption spectrum of the material.…”

Section: Resultsmentioning

confidence: 99%

Tunable optical and semiconducting properties of eco-friendly-prepared reduced graphene oxide

Tene,

Jiménez-Gaona,

Campoverde-Santos

et al. 2023

Front. Chem.

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Wide bandgap oxidized graphenes have garnered particular interest among the materials explored for these applications because of their exceptional semiconducting and optical properties. This study aims to investigate the tunability of the related properties in reduced graphene oxide (rGO) for potential use in energy conversion, storage, and optoelectronic devices. To accomplish this, we scrutinized crucial parameters of the synthesis process such as reduction time and temperature. Our findings demonstrate that controlling these parameters makes it possible to customize the optical bandgap of reduced graphene oxide within a range of roughly 2.2 eV–1.6 eV. Additionally, we observed that reduced graphene oxide has strong and superior absorption in the visible region, which is attributable to the existence of OFGs and defects. Notably, our results indicate that the absorption coefficients of reduced graphene oxide are up to almost three times higher (7426 ml mg−1 m−1) than those observed in dispersions of exfoliated graphene and graphene oxide (GO). To complement our findings, we employed several spectroscopic and morphological characterizations, including scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and electrical measurements. The implications of our results are significant for the development and design of future semiconductors for energy conversion and optoelectronic applications.

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“…aureus and E . coli [ 129 ]. Lekshmi and coworkers proved that the flame-synthesized rGO–Ag–AgO–Ag 2 O nanocomposites possessed antibacterial activity against K .…”

Section: A Mechanistic Overview Of the Antimicrobial Actionmentioning

confidence: 99%

Recent advances and mechanism of antimicrobial efficacy of graphene-based materials: a review

Bhatt¹,

Pathak²,

Punetha³

et al. 2023

J Mater Sci

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Graphene-based materials have undergone substantial investigation in recent years owing to their wide array of physicochemical characteristics. Employment of these materials in the current state, where infectious illnesses caused by microbes have severely damaged human life, has found widespread application in combating fatal infectious diseases. These materials interact with the physicochemical characteristics of the microbial cell and alter or damage them. The current review is dedicated to molecular mechanisms underlying the antimicrobial property of graphene-based materials. Various physical and chemical mechanisms leading to cell membrane stress, mechanical wrapping, photo-thermal ablation as well as oxidative stress exerting antimicrobial effect have also been thoroughly discussed. Furthermore, an overview of the interactions of these materials with membrane lipids, proteins, and nucleic acids has been provided. A thorough understanding of discussed mechanisms and interactions is essential to develop extremely effective antimicrobial nanomaterial for application as an antimicrobial agent. Graphical abstract

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Synthesis and antibacterial activity of nanoenhanced conjugate of Ag-doped ZnO nanorods with graphene oxide

Cited by 46 publications

References 55 publications

Biogenic synthesis of Psidium guajava‐mediated silver nanoparticles: A comprehensive antibiofilm and antivirulence study

Biogenic synthesis of Psidium guajava‐mediated silver nanoparticles: A comprehensive antibiofilm and antivirulence study

Tunable optical and semiconducting properties of eco-friendly-prepared reduced graphene oxide

Recent advances and mechanism of antimicrobial efficacy of graphene-based materials: a review

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