Coir mediated instant synthesis of Ni-Pd nanoparticles and its significance over larvicidal, pesticidal and ovicidal activities

Currently phytochemical approach for the synthesis of metal nanopartides plays a major role. In this manuscript phytochemical synthesis of Ni-Pd bi-metallic nanoparticles (Ni-Pd NPs) were subjected for various biological applications like pesticidal, larvicidal and ovicidal activities. The synthesized Ni-Pd NPs were confirmed by various characterization techniques, The XRD pattern confirms the formation of Ni-Pd NPs in purest crystalline form and it matches with the Joint Committee Powder Diffraction Standard data of JCPDS: 65-5788. The crystalline sizes of bi-metallic nanoparticles were found to be 33 nm which is calculated from Scherrer equation. TEM images clear cuts the spherical particle of Pd NPs with over layered by Ni NPs. The TEM histogram analysis helps to find the average particle size of Ni-Pd NPs as 34 2 nm. The EDAX spectrum also confirms the presence of palladium and nickel atom. Further the synthesized bi-metallic nanoparticles were subjected for larvicidal activity against Aedes aegypti (A. aegypti) which resulted in LC50 and LC90 of 288.88 ppm and 483.06 ppm respectively. Also in this manuscript phyto-synthesized Ni-Pd NPs were subjected to antifeedant activity against Callosobruchus maculatus (C. maculatus) and ovicidal activity against eggs of C maculatus were performed. (c) 2016 Published by Elsevier B.V.