SYNTHESIS OF PVP STABILIZED SILVER NANOSTRUCTURES AND STUDY OF THEIR PHYSICAL AND BIOLOGICAL PROPERTIES

Abstract

1'he present work reports synthesis of l'VP coated silver nanostructures in a self assembled bottom-Lip approach. Their characterization carried out by XRD, FTIR, AFM, FESEM and 'l'FM. 'their optical, electrical and antibacterial activities have also been analysed. The size of Ag —PVP nanoparticles also found to be the function of concentration of seed Ag particles used for their preparation. For different seed concentration (106 rnol/dm3) at: 1.73, 2.88 and 5. 19. the particle size (nm) decreases as: 15, 7 and 2 respectively. 'Fhese particles undergo aoZ~ tol rc-1o1 a tioii to form chain like structure upon ageing. l:i.cshly prepared optimized silver nanoparticles show an absorption peak around 399 1101 which red shifted upon ageing to 409 nm along with the appearance of a new peak at 263 nm, indicating a change in there morphology as arrived by electron microscopic studies. These nanosiructures exhibit interesting fluorescing behaviour, depending upon the excitation energy. Under 450 nm excitation, emission was observed to have various characteristic bands at 468. 494, 511, 530 and 563 nm respectively. Ag-PVP nanochains were tested for antibacterial activity against E.coli and S. aureus. l'hesc particles were found to inhibit the growth of' S. aureus at 6 ig/gL. As synthesized, silver nanostructures may find applications in the field of optoelectronics, biosensing and b iotec hn o logy