Low energy Ag ion irradiation-induced surface modification studies of Au-graphene oxide nanocomposite thin films

Kalia, Shiwani; Salim, Amena; Bala, Ritu; Singh, Rajesh Kumar; Singhal, Rahul; Dhiman, Rajnish

doi:10.1016/j.tsf.2023.139802

Cited by 5 publications

(2 citation statements)

References 39 publications

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“…Figures 3(a)-(f) show the Raman spectra of GO, Ag-rGO@RT, Ag-rGO@100C, rGO, Ag-rGO@150C and Ag-rGO@200C samples. Spectra of these samples mainly show two characteristic bands, corresponding to D and G bands of the graphitic carbon; they lie in the range of 1339-1349 cm −1 and 1588-1592 cm −1 respectively [26]. The appearance of the D band can be attributed to the breathing mode of the K-point phonon characterized by A 1g symmetry, while the G band can be ascribed to the E 2g phonon of C-C sp 2 atoms.…”

Section: Raman Spectroscopymentioning

confidence: 93%

Synergistic effects of hydrothermally decorated Ag nanoparticles over rGO for antibacterial activities

Kalia,

Bala,

Jain

et al. 2023

Phys. Scr.

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Antibacterial activity of the silver decorated reduced graphene oxide (Ag-rGO) nanocomposites have been investigated against E. coli as a model for gram-negative bacteria. The effect of temperature during the hydrothermal treatment of Ag-rGO nanocomposites synthesized by simultaneous reduction of GO and AgNO3 over the antibacterial activity has been studied. The composite samples were further reduced hydrothermally at different temperatures, viz. 100 °C, 150 °C, and 200 °C for 24 h to integrate silver nanoparticles (AgNPs) into rGO. Variations in the hydrothermal treatment temperature allowed alterations in the morphology and particle size of the AgNPs. The AgNPs grown at room temperature are in bunches and smaller sizes, whereas the hydrothermally treated samples have uniformly distributed bigger AgNPs. The particle size of AgNPs on rGO grows from 45 nm at room temperature to 65 nm and 220 nm in the hydrothermally treated samples at 150 °C and 200 °C, respectively. The antibacterial activity of the Ag-rGO composite has been observed to be size dependent. The Ag-rGO composite hydrothermally treated at 150 °C, having a particle size of ∼65 nm, has been observed to have the highest activity; the zone of inhibition is 3.4 ± 2.8 cm. The Ag nanocrystallite’s edges and defects in the rGO sheets together destroy the bacterial cells in a series of stages, ultimately resulting in cell death and high antibacterial activity.

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Section: Raman Spectroscopymentioning

confidence: 93%

Synergistic effects of hydrothermally decorated Ag nanoparticles over rGO for antibacterial activities

Kalia,

Bala,

Jain

et al. 2023

Phys. Scr.

Self Cite

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“…With increased radiation dose, the molecular weight of the chitosan decreased and remained basically unchanged after 100 KGy. This might be because the energy at this dosage could not break the chain of chitosan anymore [38]. Figure 1 shows the inhibitory effects of the irradiated chitosan at different doses on Escherichia coli (Figure 1a), Shewanella putrefaciens (Figure 1b), Staphylococcus aureus (Figure 1c), and Salmonella typhimurium (Figure 1d).…”

Section: Irradiation Of Chitosanmentioning

confidence: 99%

Preparation and Characterization of a Biodegradable Film Using Irradiated Chitosan Incorporated with Lysozyme and Carrageenan and Its Application in Crayfish Preservation

Qiu

Luo

Bai

et al. 2023

Foods

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In this study, a composite film was prepared using irradiated chitosan, lysozyme, and carrageenan for crayfish preservation. First, the chitosan was degraded by gamma rays, with the best antimicrobial properties being found at 100 KGy. By using the response surface method, the components of the composite film were irradiated chitosan (CS) at 0.016 g/mL, lysozyme (LM) at 0.0015 g/mL, and carrageenan (CA) at 0.002 g/mL. When compared to the natural chitosan film, the Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) results demonstrated that the chemical properties of the composite film did not change with the addition of LM and CA, while the physical and antibacterial properties increased, including tensile strength (16.87 → 20.28 N), hydrophobicity (67.9 → 86.3°), and oxygen permeability (31.66 → 24.31 m3∙um/m2∙day∙kPa). Moreover, the antibacterial activity of the films increased with the addition of LM and CA, especially for Shewanella putrefaciens: the zone of inhibition (mm) of CS, CS/LM, and CS/LM/CA was 9.97 ± 0.29, 14.32 ± 0.31, and 14.78 ± 0.21, respectively. Finally, the CS/LM/CA film could preserve crayfish for 10 days at 4 °C, whereas the polyethylene (PE) film could only preserve them for 6 days. Moreover, the composite film was excellent at inhibiting oxidative deterioration (TBARS value: 2.12 mg/kg, day10) and keeping the texture of crayfish muscle. Overall, our results suggested that the CS/LM/CA composite film produced can be applied as a biodegradable film in aquatic product packaging.

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Facile Hydrothermal Synthesis of Boron and Nitrogen-Doped RGO as Electrode Material for Supercapacitors

Shrivastav,

Yadav,

Dhiman

2024

Springer Proceedings in Materials

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Low energy Ag ion irradiation-induced surface modification studies of Au-graphene oxide nanocomposite thin films

Cited by 5 publications

References 39 publications

Synergistic effects of hydrothermally decorated Ag nanoparticles over rGO for antibacterial activities

Synergistic effects of hydrothermally decorated Ag nanoparticles over rGO for antibacterial activities

Preparation and Characterization of a Biodegradable Film Using Irradiated Chitosan Incorporated with Lysozyme and Carrageenan and Its Application in Crayfish Preservation

Facile Hydrothermal Synthesis of Boron and Nitrogen-Doped RGO as Electrode Material for Supercapacitors

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