Mesoporous Gold and Palladium Nanoleaves from Liquid–Liquid Interface: Enhanced Catalytic Activity of the Palladium Analogue toward Hydrazine-Assisted Room-Temperature 4-Nitrophenol Reduction

Abstract

The importance of an interfacial reaction to obtain mesoporous leafy nanostructures of gold and palladium has been reported. A new synthetic strategy involving 1,4-dihydropyridine ester (DHPE) as a potential reducing agent performs exceptionally well for the desired morphologies of both the noble metals at room temperature. The DHPE in turn transforms into its oxidized aromatic form. The as-synthesized gold leaves exhibit high surface-enhanced Raman scattering activity with rhodamine 6G (R6G) due to their hyperbranched structure. It is worthwhile that as-synthesized porous architectures of palladium support the room-temperature hydrogenation of 4-nitrophenol (4-NP) by hydrazine hydrate (N2H4·H2O), reported for the first time. Furthermore, MPL exhibits exceptionally good catalytic activity toward electrooxidation of formic acid. Therefore, an aromaticity driven synthetic technique achieves a rationale to design leafy nanostructures of noble metals from the liquid-liquid interface for multifaceted applications.

Au@Pd core–shell nanoparticles-decorated reduced graphene oxide: a highly sensitive and selective platform for electrochemical detection of hydrazine

“…), [3][4] researchers are engaged to fabricate numerous important noble metal based bimetallic nanostructures e.g. 4,9 Furthermore, anchoring Au nanoparticles with Pd nanocatalyst results in a bio-compatible bimetallic nanostructures with an improved electrochemical stability and electrical conductivity than single Pd analogue. Platinum is known to show excellent electrochemical activities such as electrooxidation, fuel cell, sensing etc.…”

Hollow poly(cyclotriphosphazene-co-phloroglucinol) microspheres: An effective and selective adsorbent for the removal of cationic dyes from aqueous solution

“…To date, many efforts have been focused on micro-/nanostructured materials including spheres, sheets, wires, rods, tubes and leaves due to their specific morphologies, fascinating properties and potential applications [15][16][17][18][19][20][21]. Among them, micro-/nanospheres with a hollow structure have gained more and more attention because of their unique interior cavity which can bring them broad applications in the fields of pollutant disposal, microreactors, Li-ion batteries, biomedicines, sensors, catalysis, and many others.…”

Metal Bromide Controlled Interfacial Aromatization Reaction for Shape‐Selective Synthesis of Palladium Nanostructures with Efficient Catalytic Performances

“…The unique soft template, that is, the interface, directs the assembly of the nanoparticles to construct intriguing morphologies of the nanomaterials. Our group is engaged in fabricating various interesting morphologies of metal and metal sulfide nanostructures at the liquid–liquid interface . For mesoporous leafy palladium nanostructures (MPL) synthesis, we have reported the novelty of the ‘dichloromethane/water’ interface where an aqueous H 2 PdCl 4 solution is reduced by Hantzsch dihydropyridine ester (DHPE) in the organic layer at room temperature .…”

“…Our group is engaged in fabricating various interesting morphologies of metal and metal sulfide nanostructures at the liquid–liquid interface . For mesoporous leafy palladium nanostructures (MPL) synthesis, we have reported the novelty of the ‘dichloromethane/water’ interface where an aqueous H 2 PdCl 4 solution is reduced by Hantzsch dihydropyridine ester (DHPE) in the organic layer at room temperature . As an ongoing activity, we have tried to synthesize alternative nanostructures of Pd from the same reaction with excess bromide ions in the aqueous medium.…”