Author(s): Shankar SS, Rai A, Ahmad A, Sastry M
We report on the use of Neem (Azadirachta indica) leaf broth in the extracellular synthesis of pure metallic silver and gold nanoparticles and bimetallic Au/Ag nanoparticles. On treatment of aqueous solutions of silver nitrate and chloroauric acid with Neem leaf extract, the rapid formation of stable silver and gold nanoparticles at high concentrations is observed to occur. The silver and gold nanoparticles are polydisperse, with a large percentage of gold particles exhibiting an interesting flat, platelike morphology. Competitive reduction of Au3+ and Ag+ ions present simultaneously in solution during exposure to Neem leaf extract leads to the synthesis of bimetallic Au core-Ag shell nanoparticles in solution. Transmission electron microscopy revealed that the silver nanoparticles are adsorbed onto the gold nanoparticles, forming a core-shell structure. The rates of reduction of the metal ions by Neem leaf extract are much faster than those observed by us in our earlier studies using microorganisms such as fungi, highlighting the possibility that nanoparticle biological synthesis methodologies will achieve rates of synthesis comparable to those of chemical methods.
Referred From: https://www.ncbi.nlm.nih.gov/pubmed/15178278
Author(s): Suriamoorthy P, Zhang X, Hao G, Joly AG, Singh S, et al.
Author(s): Parveen S, Sahoo SK
Author(s): Smith GL, Shih YC, Giordano SH, Smith BD, Buchholz TA
Author(s): Nel A, Xia T, Mädler L, Li N
Author(s): Seigneuric R, Markey L, Nuyten DS, Dubernet C, Evelo CT, et al.
Author(s): Thorek DL, Chen AK, Czupryna J, Tsourkas A
Author(s): Huang X, Jain PK, El-Sayed IH, El-Sayed MA
Author(s): El-Sayed IH, Huang X, El-Sayed MA
Author(s): Abdelwahed W, Degobert G, Stainmesse S, Fessi H
Author(s): Donaldson K, Aitken R, Tran L, Stone V, Duffin R, et al.
Author(s): Wyllie AH
Author(s): Koopman G, Reutelingsperger CP, Kuijten GA, Keehnen RM, Pals ST, et al.
Author(s): Durand RE
Author(s): Chandran SP, Chaudhary M, Pasricha R, Ahmad A, Sastry M
Author(s): Kasthuri J, Kathiravan K, Rajendiran NJ
Author(s): Shipway AN, Katz E, Willner I
Author(s): Singh M, Kalaivani R, Manikandan S, Sangeetha N, Kumaraguru AK
Author(s): Chen PC, Mwakwari SC, Oyelere AK
Author(s): Gobin AM, Lee MH, Halas NJ, James WD, Drezek RA, et al.
Author(s): Sperling RA, Rivera Gil P, Zhang F, Zanella M, Parak WJ
Author(s): Giljohann DA, Seferos DS, Daniel WL, Massich MD, Patel PC, et al.
Author(s): Gavrieli Y, Sherman Y, Ben-Sasson SA
Author(s): Zhao ZQ, Nakamura M, Wang NP, Wilcox JN, Shearer S, et al.
Author(s): Oberhammer F, Wilson JW, Dive C, Morris ID, Hickman JA et al.
Author(s): Aljandali A, Pollack H, Yeldandi A, Li Y, Weitzman SA, et al.
Author(s): Isakovic A, Markovic Z, Todorovic-Markovic B, Nikolic N, Vranjes-Djuric S, et al.
Author(s): Ciapetti G, Granchi D, Savarino L, Cenni E, Magrini E, et al.
Author(s): Allen RT, Hunter WJ 3rd, Agrawal DK