Abstract
Silver-gold nanoalloys were prepared from their metal salts precursors through bottom-up mechanochemical synthesis, using one-pot or galvanic replacement reaction strategies. The nanostructures were prepared over amorphous SiO2 as an inert supporting material, facilitating their stabilization without the use of any stabilizing agent. The nanomaterials were extensively characterized, confirming the formation of the bimetallic nanostructures. The nanoalloys were tested as catalysts in the hydrogenation of 2-nitroaniline and exhibited up to 4-fold the rate constant and up to 37% increased conversion compared to the respective single metal nanoparticles. Our approach is advantageous to produce nanoparticles with clean surfaces with available catalytic sites, directly in the solid-state and in an environmentally friendly manner.
Highlights
The interest in designing metal nanoparticles (NPs) is in constant increase, resulting from the exceptional properties of the nanostructures, which are relevant in catalysis (Araujo et al, 2019), energy (Califano et al, 2021), biomedicine (Li et al, 2017), and sensing (Jeon et al, 2016; Ma et al, 2020)
We describe different approaches for the bottom-up mechanochemical synthesis of noble metal AgAu nanoalloys
The specific combination of Ag and Au as noble metals in bimetallic systems offers the opportunity to minimize the cost of Au catalysts and, at the same time, enhance the material catalytic performance through use synergistic effects (Slater et al, 2014)
Summary
The interest in designing metal nanoparticles (NPs) is in constant increase, resulting from the exceptional properties of the nanostructures, which are relevant in catalysis (Araujo et al, 2019), energy (Califano et al, 2021), biomedicine (Li et al, 2017), and sensing (Jeon et al, 2016; Ma et al, 2020). Many advances have been made in tuning the properties of single metal NPs by controlling their size and shape. A material containing a single element hardly satisfies all the requirements for a certain application. For industrial purposes the material should be available at scale. These technological demands can be accomplished by the association of two or more elements into the final nanostructure. The combination of different metals in a single nanostructure is an opportunity to integrate the properties emerging from all individual contributors in a synergistic fashion (Gilroy et al, 2016)
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