Green synthesized (Ocimum sanctum and Allium sativum) Ag-doped cobalt ferrite nanoparticles for antibacterial application

Abstract

Cobalt ferrite and silver doped cobalt ferrite, AgxCo1−xFe2O4, (x = 0, 0.005, 0.01, 0.02) nanoparticles were synthesized through sol-gel auto-combustion technique via chemical and green synthesis (using the extract of tulsi seeds(Ocimum sanctum) and garlic cloves(Allium sativum)). Systematic characterization by XRD, FTIR, FE-SEM and EDX has been performed to study structural, morphological and magnetic behavior of the prepared samples. XRD confirms that the prepared samples are crystalline and have a cubic (inverse spinel) structure. Absorption bands have been studied using FTIR that further confirms the formation of single phase spinel crystal structure having two sub-lattices (Td and Oh). FE-SEM micrographs reveal the formation of cubic and encapsulated type structure in case of chemical and green synthesis respectively. EDX confirms the presence of all the required elements in the respective stoichoimetric ratios. Magnetic measurements through VSM at room temperature show that the magnetic saturation values for samples obtained using tulsi seed extract mediated synthesis and chemical synthesis are much higher than those obtained using garlic extract. The antibacterial activity of all the prepared samples against gram positive and gram negative strains were investigated and a modified mechanism of action for the antibacterial activity is proposed.