Rapid and green synthesis of bimetallic Au–Ag nanoparticles using an otherwise worthless weedAntigonon leptopus

Abstract

We demonstrate a simple, straightforward, clean-green, single pot approach for the synthesis of bimetallic Ag/Au nanoparticles (BNPs) by using a highly invasive terrestrial weed coral vine (Antigonon leptopus). Aqueous extracts of the weed were found to reduce the metal ions to form nanosised aggregates and then stabilise them by preventing further aggregation. The efficacy of the extracts of all its parts was explored by varying the stoichiometry of reactants, temperature, pH and reaction time. The electron micrographs of the synthesised BNPs indicated the presence of particles of predominantly spherical shapes in sizes ranging from 10 to 60 nm. The presence of gold and silver atoms was confirmed from the energy dispersive X-ray, X-ray photoelectron and X-ray diffraction studies. The Fourier transform infra-red spectroscopic spectral study indicated that the phenolics (including flavonoids) and proteins contained in the plant extract could have been responsible for the formation and stabilisation of the BNPs.

Synthesis and Application of Silver Nanoparticles (Ag NPs) for the Prevention of Infection in Healthcare Workers

“…Nicotinamide adenine dinucleotide-dependent reductase can produce Ag NPs by enzymatic reduction; however, the enzymatic reduction rate is often slow [22]. Some biological materials using green synthesis methods using bacteria [23,24,25,26,27,28,29], fungi [30,31,32,33,34,35], and plant [36,37,38,39,40,41,42] are shown in Table 1.…”

Green controllable synthesis of Au–Ag alloy nanoparticles using Chinese wolfberry fruit extract and their tunable photocatalytic activity

“…[33][34][35] Up to now, based on green synthesis methods, it is difficult to exibly change the SPR wavelength of Au-Ag alloy NPs in one-pot when the Au 3+ /Ag + molar ratio in raw materials is xed. [17][18][19][20] To obtain eco-friendly Au-Ag alloy NPs, the wolerry fruit extract was used as reductant and surfactant. Fig.…”

“…12,13 In recent years, green synthesis methods, employing microorganisms or plant extracts as reductants, have been considered as an eco-friendly alternative to physical and chemical methods because of their obvious advantages in safety, cost-effectiveness and biocompatibility. [14][15][16][17] In particular, the green synthesis methods based on plant extracts provide a promising choice for the synthesis of Au-Ag alloy NPs. Nevertheless, only a few kinds of plants, such as Cacumen platycladi leaf extract, Silybum marianum seed extract, and the fruit juice of pomegranate, were used to prepare Au-Ag alloy NPs.…”

Synthesis, Properties, and Biological Applications of Metallic Alloy Nanoparticles

“…Many monometallic nanoparticles were manufactured using citrus fruit peel extract, grape waste, mango peel, rice husk, sugar cane bagasse and leaves, bamboo leaves, egg shell, and coconut shells. Moreover, Au–Ag and CdS alloy nanoparticles were also manufactured using banana peels and the otherwise useless weed Antigonon leptopus [ 196 , 197 , 198 ].…”