Solvent-Mediated Eco-Friendly Synthesis and Characterization of Monodispersed Bimetallic Ag/Pd Nanocomposites for Sensing and Raman Scattering Applications
The solvent-mediated eco-friendly monodispersed Ag/Pd bimetallic nanocomposites (BNCs) having thick core and thin shell have been prepared through novel green chemical solvent reduction method. Reducing solvent, dimethyl formamide (DMF) is employed for the controlled green synthesis. Characterization of the synthesized Ag/Pd BNCs has been done by x-ray diffraction (XRD) studies, high-resolution scanning electron microscopy (HR-SEM), energy-dispersive X-ray analysis (EDX), and high-resolution transmission electron microscopy (HR-TEM) with selected area electron diffraction (SAED) pattern. The nature of the interaction of L-cysteine with Ag/Pd BNCs has been studied by using surface plasmon spectroscopy, Fourier transform-infrared spectroscopy (FT-IR), cyclic voltammetry (CV), and theoretical methods. 1. Introduction Noble metallic nanocomposites are well known for their important applications in catalysis, biotechnology, bioengineering, surface-enhanced spectroscopy, textile engineering, nonlinear optical materials, water treatment, electronics, and optoelectronics [1–9]. However the advantage in tuning the physical and chemical properties using a bimetallic combination has triggered special interest in the synthesis and stabilization of the bimetallic over monometallic nanoparticles [10]. The bimetallic nanoparticles (BNPs) have either a core shell or different structures and the kind of this structure is decided by the method of the preparation and the control of bimetallic composition of nanoparticles. This is crucial to the improvement of essential properties of nanoparticle [11]. For instance, size-dependent core-shell Au-Ag BNPs at normal temperature had been reported [12]. Similarly, Pt-Pd BNPs having core-shell structure can be synthesized in a single-step process [13]. To validate this concept many reports were available for the synthesis of BNPs. Particularly, Ag/Pd BNCs have attracted much interest because of their superior catalytic activity in selective hydrogenation reaction [14] and the number of methods has been developed to synthesize Ag/Pd nanoparticles as a single entity [15–17]. This study particularly deals with the synthesis of Ag/Pd BNPs, having core-shell structure, involving green chemical reduction of their respective metal ions using DMF as a reducing solvent. Even though the synthesis of Ag nanoparticles using DMF has already been reported [18, 19], not much is known about the BNCs. It is also equally important to analyze the interfacial properties of the BNPs; for instance, adsorption of L-cysteine molecule on the surface of
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