Optical and antibacterial properties of synthesised silver nanoparticles

Abstract

In the present study, tri-sodium citrate has been used as both the reducing agent and stabiliser for the synthesis of silver nanoparticles (AgNPs). Sodium borohydride (NaBH 4) was used in various concentrations. The absorbance of AgNP solution was measured after the addition of NaBH 4. The samples were characterised by ultraviolet-visible spectroscopy after 5, 10, 15, 25, 60 and 120 min of synthesis to investigate the stability of AgNPs for different concentrations of NaBH 4. Transmission electron microscopy revealed the nanostructure of the prepared samples with average sizes as 18, 20 and 29 nm. Photoluminescence spectra of these AgNPs showed maximum emission at wavelengths 473, 470 and 469 nm, respectively, when excited at 350 nm. Further, Disk diffusion test showed that all the prepared samples are good candidates for antibacterial activity while AgNPs of average size 18 nm were found most effective against the tested Grampositive and Gram-negative bacteria.

Antibacterial properties of synthesized Ag and Ag@SiO2 core–shell nanoparticles: a comparative study

“…[9] . Previously, the antibacterial action of Ag-based NPs based on dissolved Ag (I) had been reported [9,10,19]. In this work, our results showed that compared to AgNP, Ag (I)-supporting SiO 2 has a significant increase in antibacterial activity.…”

Synthesis of Silver Nanoparticles Using Aqueous Leaf Extract of Mimosa albida (Mimosoideae): Characterization and Antioxidant Activity

“…The study of silver nanoparticles (AgNPs), has undergone a breakthrough in recent decades, mainly due to their optical [1,2] and antimicrobial properties [3][4][5][6]. AgNPs can be prepared by Materials 2020, 13, 503 2 of 17 means of physical, chemical, electrochemical and biological methods [7,8].…”

Optimisation of significant parameters through response surface methodology in the synthesis of silver nanoparticles by chemical reduction method

“…They have been attracting interest due to their excellent optical, electrical, thermal, antimicrobial and localised surface plasmon resonance properties [1][2][3]. These nanoparticles (NPs) are already finding applications in a wide variety of fields including printed electronic devices [4], plasmonics [5], antibacterial materials [6] and biosensors [7]. Among these applications, printed electronic devices have gained considerable interest in recent years [8].…”