Facile solid-state synthesis of oxidation-resistant metal nanoparticles at ambient conditions

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>A simple and scalable method for the synthesis of metal nanoparticles in the solid-state was developed, which can produce nanoparticles in the absence of solvents. Nanoparticles of coinage metals were synthesized by grinding solid hydrazine and the metal precursors in their acetates and oxides at 25 °C. The silver and gold acetates converted completely within 6 min into Ag and Au nanoparticles, respectively, while complete conversion of the copper acetate to the Cu sub-micrometer particles took about 2 h. Metal oxide precursors were also converted into metal nanoparticles by grinding alone. The resulting particles exhibit distinctive crystalline lattice fringes, indicating the formation of highly crystalline phases. The Cu sub-micrometer particles are better resistant to oxidation and exhibit higher conductivity compared to conventional Cu nanoparticles. This solid-state method was also applied for the synthesis of platinum group metals and intermetallic Cu<SUB>3</SUB>Au, which can be further extended to synthesize other metal nanoparticles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A simple and scalable method for the synthesis of metal nanoparticles in the solid state was developed. </LI> <LI> Nanoparticles of coinage and platinum group metals were synthesized from solid hydrazine and corresponding metal precursors. </LI> <LI> The Cunanoparticles are better resistant to oxidation and exhibit higher conductivity compared to conventional Cu ones. </LI> <LI> This solid-state method was successfully applied for the synthesis of intermetallic Cu<SUB>3</SUB>Au nanoparticles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Metal nanoparticles were synthesized in the solid-state by grinding solid hydrazine with metal precursors at ambient temperature. This facile method is easily scalable without the need for large reaction vessels.</P> <P>[DISPLAY OMISSION]</P>