Chemo-bio Synthesis of Silver Nanoparticles

Abstract

Silver nanoparticles have a lot of ways of synthesis like physical and chemical methods; some of these methods use a lot of chemical substances and are very hazardous for humans and environment, so a novel, great, environmental friendly, cheap and easy to use world of green chemistry has been used. A number of characterization techniques such as UV-visible spectroscopy, Fourier transformation infrared spectroscopy, X-ray diffraction study and scanning electron microscopy revealed that silver nanoparticles have been used. Thus the different response of the functional groups and the difference in the peaks and UV-visible data was studied and then compared to understand and know the way these different reducing agents react to the same starting material. The green synthesis had a UV-visible peak at 446 nm while the one with chemical synthesis had a peak at 395 nm. FTIR results of silver nanoparticles synthesis by trisodium citrate (TSC) showed a peak at 1505 cm-1 which shows that the compound has a stretching of the -C=C – bond. In another case, which was done by using Sodium borohydride (NaBH4) a peak at 1695 cm-1 showed a –C=O- bond indicating stretching and a weak absorption intensity. Another peak was present which indicates a –O-H bond formation and presence which is a strong bond are found to exist. A notable peak came for synthesis by orange peel at 1517 cm-1 which represents a –C=C- bond stretching as in aromatic compounds. Another peak at 1732 cm-1 indicates the –C=O- bond. The XRD results on one of the silver sample prepared by green methods showed silver nanomaterials formed which had a average particle size of around 42 nm. FE-SEM results revealed that silver nanomaterials were formed and had a flake like appearance in one of the results. All the overall comparison showed that different modes of synthesis of silver nanomaterials and different reducing agents give same materials but with different peaks and intensities. All this data provided knowledge about the fact that an alternative method can be used to create new nanoparticles if one of the previously considered to tried method fails thus helping in extending the broadways for research.