Bio-synthesis of Silver Nano-prisms from Ocimum sanctum manipulation of Localised surface Plasmon through induced resonance

Abstract

Localised surface Plasmon Resonance (LSPR) is a phenomenon in its starting stages that is being put through study for its sensing applications. With the rise of a new innovation comes the lack of considerations for the environment and this has been established by the many centuries of industrial revolution all around the world. This work was initiated as an attempt to produce optically configured Silver Nano-prisms through Eco-Friendly methodology and as an investigation to find an alternative to the traditional. Ocimum sanctum leaf extract was utilised for the traditional precipitation-stabilization biosynthetic method for its ease and efficiency. Preliminary analyses conducted, production of Silver Nano particles were characterised. This was achieved by mixing 2.5 ml of extract in AgNO3 to arrive at the same. A characteristic change in colour was observed towards an amber-brown from milky white to indicate the formation of silver Nano-particles. A clear absorbance peak at around 410 nm indicating the presence of silver Nano-particles . Now the resultant solution was exposed to varying optical condition to manipulate its Surface Plasmon and preliminary analyses showed obvious changes in optical and physical properties of the Nano-particles. These Nano-Prisms were characterised by a change in the entire particulate structure that gave it a triangular, pyramidal shape . These changes were analysed and discussed after various tests and imaging processes.