An insight into the effect of composition for enhance catalytic performance of biogenic Au/Ag bimetallic nanoparticles

Abstract

A comprehensive knowledge of composition-activity property relationship of nanoparticulate materials is highly desirable for applications in various catalysis reactions. We have addressed a facile green aqueous approach for preparation of Au, Ag monometallic, Au/Ag alloy as well as core-shell bimetallic nanoparticles. The phytochemicals present in lemon grass leaves extract were employed both as natural reducing and capping agents at room temperature.X-ray diffraction pattern, UV-Vis spectroscopy, and energy dispersive X-ray studies confirmed the formation of bimetallic system. The ensuing Au core/ Ag shell and Au/Ag alloy bimetallic nanoparticles were crystalline and spherical in nature with identical average diameter of~18 nm as measured via transmission electron microscopy. The bimetallic systems incredibly display higher catalytic potential than their monometallic counterparts which were vividly reckoned on structural effect, lattice compression, and synergistic electronic effect.

Plasmon Active Functional Coatings with Hybrid Bimetallic Nanoparticles@Polymers by a Single Step Photoinduced Approach

“…Noble metal nanoparticles (NPs), i.e., silver, gold or platinum, are sought after for their attractive optical properties, which can be used in wide variety of fields such as biomedicine, − catalysis, − photovoltaics, , or sensing − especially surface-enhanced Raman spectroscopy applications. , In particular, the localized surface plasmon resonance (LSPR), which is specific to each noble metal, provides insights into the shape and size distribution of NPs.…”

“…In solution, these BNPs are typically synthesized as alloys or core–shell structures using various techniques, which can be either top-down or bottom-up processes. In this second approach, BNPs in solution can be synthesized by chemical reduction reactions, which are often developed to obtain nanoalloys by adding reducing agents, such as citrate, , NaBH 4 , hydrazine, , or plant extracts, ,,, to metallic precursors. The issue with colloidal NPs is their tendency to aggregate in the absence of surface stabilizers, which have been shown to increase their stability but only to a certain extent .…”

Tunable Plasmon-Induced Charge Transport and Photon Absorption of Bimetallic Au–Ag Nanoparticles on ZnO Photoanode for Photoelectrochemical Enhancement under Visible Light

“…Upon photon excitation, these NPs exhibit collective oscillation of electron clouds on the surface known as localized surface plasmon resonance (LSPR), which is highly dependent on the metal type, − size, , and shape. , Metal NPs derived from solid-state thermal dewetting (SSTD) of ultrathin metal film offers facile large-area fabrication capability and its techniques to provide controllable size and spacing − in a reproducible and flexible manner is of paramount importance in plasmonic applications. Recently, bimetallic nanoparticles (BNPs) consisting of two combination of different metal types present in a nanostructure, which exhibit unique characteristics than monometallic nanoparticles (MNPs) have emerged due to their synergetic effect of its constituent elements. , Numerous research studies on SSTD fabrication have focused on different compositions of BNPs. − However, Au and Ag are promising due to their similar lattice constant, which enabled the formation of homogeneous nanostructures without lattice mismatch in the Au/Ag BNP matrix. − …”