Patent ID: 9505027
Filing Date: 2016-11-29
CPC Classification: A01N,B05D,B82Y

Claim Text:
1. A method of immobilisation of silver nanoparticles on solid substrates containing two immobilization steps and at least two washing steps wherein the immobilisation steps and the at least two washing steps are performed as follows: a first immobilisation step where a selected substrate is modified by polyethylenimine (PEI) with a branched structure by submerging the selected substrate in a bath consisting of aqueous solution of the PEI with the branched structure to form a primary deposited adhesive PEI layer with the branched structure; a first washing step where any excess PEI with the branched structure is washed off the substrate surface after the substrate is removed from the bath; and a second immobilisation step where the modified PEI substrate with the branched structure is submerged in a silver salt solution where the production of the silver nanoparticles proceeds due to reduction properties of a set of functional groups —NH and —NH2 present in the PEI polymer with the branched structure, and the silver nanoparticles remain covalently immobilised to the primary deposited adhesive PEI layer of the polyethylenimine with the branched structure; a second washing step where the selected substrate with the silver nanoparticles is washed with distilled water; and wherein the only chemicals applied in the immobilisation steps on the solid substrates are PEI with the branched structure and the silver salt solution under aqueous conditions.