Shiwani Kalia, Ritu Bala, Devendra Jain, Himmat Singh Kushwaha, Rajesh K Singh, Rajnish Dhiman
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Synergistic effects of hydrothermally decorated Ag nanoparticles over rGO for antibacterial activities
Abstract 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 AgNO 3 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.
期刊介绍:
Physica Scripta is an international journal for original research in any branch of experimental and theoretical physics. Articles will be considered in any of the following topics, and interdisciplinary topics involving physics are also welcomed:
-Atomic, molecular and optical physics-
Plasma physics-
Condensed matter physics-
Mathematical physics-
Astrophysics-
High energy physics-
Nuclear physics-
Nonlinear physics.
The journal aims to increase the visibility and accessibility of research to the wider physical sciences community. Articles on topics of broad interest are encouraged and submissions in more specialist fields should endeavour to include reference to the wider context of their research in the introduction.