Rapid and Clean Biomimetic Synthesis of Bimetallic Au-Ag Nanoparticles Using an otherwise Worthless and Noxious Weed Ipomoea (Ipomoea carnea)
In a first report of its type, gainful utilization of the obnoxious weed ipomoea (Ipomoea carnea; also known as: I. fistulosa) has been achieved by developing a procedure on its basis for clean-green one pot synthesis of bimetallic Au-Ag nanoparticles. In it the leaf and the stem extracts of the weed serve as reducing as well as stabilizing agents. With the support of Scanning Electron Microscopy, Confocal Raman Spectroscopy, and X-ray based techniques, the effect of varying metal: extract stoichiometry, temperature, and stirring on controlling the shape and size of the nanoparticles has been studied. Increase in reaction temperature is seen to favour speedier formation of nanoparticles, and of smaller average size, than occurs at ambient temperatures (27±2°C). Higher extract: metal ratios also lead to nanoparticles of larger average size. When Ag (I) and Au (III) salts are used in equal molar ratios, it generates sphere-shaped nanoparticles. All-in-all, the present work offers a non-polluting, energy saving, and cost effective route for the fabrication of bimetallic Au-Ag nanoparticles. The study indirectly provides a means of controlling ipomoea, thereby offering a means to reduce the ecological degradation that is caused by the weed.
S. U. Ganaie et al., "Rapid and Clean Biomimetic Synthesis of Bimetallic Au-Ag Nanoparticles Using an otherwise Worthless and Noxious Weed Ipomoea (Ipomoea carnea)", Journal of Nano Research, Vol. 31, pp. 1-14, 2015