Composition‐Controlled Laser‐Induced Alloying of Colloidal Au–Cu Hetero Nanoparticles

Due to their optical properties (localized surface plasmon resonance, LSPR), colloidally dispersed metal nanoparticles are well suited for selective heating by high-energy laser radiation above melting point without being limited the boiling of solvent, which represents an excellent complement wet-chemical nanoparticle synthesis. By combining synthesis and postsynthesis treatment, advantages both methods can be used specifically control nanoparticles. Especially in colloidal nanoalloys consisting two or more metals with different redox potentials, quickly reaches its limits terms composition homogeneity. For this reason, direct path is divided into parts take strengths methods. After preparing Au–Cu hetero synthesis, previous adjusted formed treatment. The formation these followed characterization methods, such as transmission electron microscopy (TEM), where fusion domains spherical homogeneous observed. Moreover, alloy shifts X-ray diffraction (XRD) reflections LSPR maxima depending on composition.