Gamma irradiated silver-anthracene nano composites for luminescent material fabrications

摘要

Silver nano particles are prepared from Aloe barbadensis miller extract. Morphological study like transmission electron microscopy is carried out. Evidence of nano particle agglomeration is observed in the diagram. It can be eliminated by suitable gamma irradiation. M orphology of gamma irradiated colloidal nano sample possesses individual spherical nature of nano particle. The selected area diffractogram of silver nanoparticles show white ring like pattern indicatingthe poly crystalline property. The diffraction rings could be indexed on the basis of image-J and CSpot software and are found having face centered pattern. From UV-Visible absorption spectra, the band gap energy of all the samples are calculated and is well suited with the standard value of colloidal nano silver. It undergoes a direct allowed type band transition between the bands. CIE chromaticity diagram of silver-anthracene nano composite gives a better photoluminescence in blue green region of electromagnetic spectrum while the silver nano colloid and gamma irradiated silver colloid gives a fluorescence quenching effect. Nano composite of gamma irradiated colloidal nano particles can be effectively used for photo luminescent material fabrication.