Antibacterial, antioxidant and physicochemical investigations of tin dioxide nanoparticles synthesized via microemulsion method

The Tin dioxide nanoparticles (SnO₂ NPs) were synthesized by modified microemulsion method and were screened for antibacterial and antioxidant applications. The crystalline nature was explored by using x-ray diffraction (XRD) analysis and the calculated crystallite size is 24.68 nm. The morphology was examined by scanning and transmission electron microscopies (SEM and TEM) and particles based on TEM image is 79.10 nm. The elemental analysis was performed by energy dispersive x-ray (EDX) and only desired elements was detected. The optical activity was investigated using diffuse reflectance spectroscopy (DRS) and band gap derived via Tauc plot is 2.82 eV. The surface functional moiety was detected by Fourier transform infrared spectroscopy (FTIR). The agar well diffusion technique was manipulated to screen the SnO₂ NPs against selected bacteria whereas DPPH free radical scavenging activity was also performed. The activity of both samples was noticed to increase with increasing the amount of samples in the experiment. The SnO₂ NPs with IC₅₀ value of 1.50 g was found more active than the ascorbic acid with IC₅₀ of 2.42 g. (paper)