One pot green synthesis of Pt, Co and Pt@Co core‐shell nanoparticles using Sechium edule

Abstract

BACKGROUND: Common approaches for the synthesis of metallic nanostructured materials require the use of fine chemicals and energy-intensive processes. This work reports a simple eco-friendly (green) method to engineer the structure of cobalt (Co), platinum (Pt) and PtCo core-shell nanoparticles using plant-based analytes present in the extract of Sechium edule, the fruit of a perennial climber plant. RESULTS: Ascorbic acid (294 mg kg −1 dry fruit) was found to be the primary analyte and it acted for both metal ion reduction and nanoparticle destabilization forming a conjugate with the carboxylate group. The sharp rise in negative zeta-potential with the rise in pH from a highly acidic medium resulted from a strong destabilization tendency of Pt and Co nanostructures over a wide pH range. The size and colloidal stability, morphology and crystal structure were confirmed with the support of dynamic light scattering, transmission electron microscopy and X-ray diffraction. Co nanoprisms (47.3 nm), Pt nanospheres (28.6 nm) and PtCo core-shell (13.2-26.4 nm) nanoparticles were formed with a polydispersity index of 0.18-0.38. The synergistic effects such as ligand interaction between core and shell and the geometric effect improved the antibacterial activity against Bacillus subtilis and Escherichia coli bacteria in comparison to Pt nanospheres and Co nanoprisms, and these results were comparable with ciprofloxacin and cefprozil as the antibiotic controls. CONCLUSION: Plant analytes served as the electron donors for the formation of Pt and Co nanostructures and also stabilized the particles growth to tailor their structures for an improved antibacterial functionality.

Bismuth‐Noble Metal Alloy Nanostructures Prepared by Colloidal Chemical Routes for Use in Hydrogen Evolution and Oxygen Reduction Electrocatalysis: Bi‐Pt Versus Bi‐Pd

“…This would lead to the acquisition of a Pt(0)‐richer core. [ 39 ] With the evolution of the reaction, Bi and Pt diffused better with each other to create a PtBi 2 alloy, as shown by the XRD, while it is possible that a small amount of platinum did not form an alloy with the bismuth, and stayed rather intact. This might explain the abundance of Pt identified from the EDX analysis of Figure S12 (Supporting Information).…”

Usage of Platinum Nanoparticles for Anticancer Therapy over Last Decade: A Review

“…[48] On this account, a significant amount of research focusing on the development of platinum nanoparticle based nanocarrier and its potential applications in cancer diagnostics and treatment has been carried out. [44] PtNPs of controlled shape and size have been synthesized by various chemical [49][50][51][52][53] (microemulsion, chemical reduction, sonochemical, electrochemical, solvothermal decomposition) physical [54,55] (pulse laser ablation, microwave irradiation) and biological [56][57][58] (bacteria, fungi, plants) methods. The application of PtNPs in cancer diagnostics and therapy is due to its optimistic physical and chemical properties which give an edge that provides the possibilities for developing anticancer nanoagents.…”