OICC Press Journal of Nanostructure in Chemistry 2193-8865 9 2 (June 2019) 2019 05 29 Eco-friendly approach in synthesis of silver nanoparticles and evaluation of optical, surface morphological and antimicrobial properties 10.1007/s40097-019-0306-9 EN Venilla Selvaraj Department of Physics, Jayaraj Annapackiyam College for Women (Autonomous), Periyakulam, Tamilnadu, 625 605, IN Suresh Sagadevan Nanotechnology and Catalysis Research Centre, University of Malaya, Kuala Lumpur, 50603, MY Lakshmipathy Muthukrishnan Leather Process Technology, Tannery Division, CSIR-Central Leather Research Institute (CLRI), Chennai, Tamilnadu, 600 020, IN Mohd. Rafie Johan Nanotechnology and Catalysis Research Centre, University of Malaya, Kuala Lumpur, 50603, MY Jiban Podder Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, 1000, BD Journal Article 2019 05 29 Abstract Silver nanoparticles (Ag NPs) were synthesized using Alternanthera sessilis leaf and Oregano root extract in an eco-friendly fashion and their significant physicochemical and optochemical properties were ascertained for nano-defined characteristics. The UV–visible spectrum showed a single and distinct absorbance peak at 433 nm ( Alternanthera sessilis ) and 425 nm ( Oregano ), typical SPR (surface plasmon resonance) for silver. Structural studies revealed nano-crystal with face centre cubic (FCC) symmetry with monodispersed nature. SEM studies showed spherical-shaped particles and the purity determined from EDX spectrum. The synthesized Ag NPs showed that antibacterial activity was studied. There was a significant inhibitory effect toward clinically important pathogens viz. B. subtilis , S. aureus , P. aeruginosa, and E. coli exposed to Ag NPs at different concentrations. Graphic abstract