TY - JOUR

T1 - Composition-Controlled Laser-Induced Alloying of Colloidal Au–Cu Hetero Nanoparticles

AU - Kranz, Daniel

AU - Bessel, Patrick

AU - Rosebrock, Marina

AU - Niemeyer, Max

AU - Dorfs, Dirk

N1 - Funding Information: D.K. would like to thank the Konrad‐Adenauer‐Stiftung (KAS) for financial support. D.D. and M.R. are grateful for funding by the German Research Foundation under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC2122). P.B. acknowledge financial support by the Hannover School of Nanotechnology (HSN). D.D. and M.N. acknowledge financial support by the German Research Foundation (DGF) research grant 1580/5‐1. The authors thank the Laboratory of Quantum and Nanoengineering for the use of the TEM and Apl. Prof. Armin Feldhoff for the use of the XRD. Funding Information: D.K. would like to thank the Konrad-Adenauer-Stiftung (KAS) for financial support. D.D. and M.R. are grateful for funding by the German Research Foundation under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC2122). P.B. acknowledge financial support by the Hannover School of Nanotechnology (HSN). D.D. and M.N. acknowledge financial support by the German Research Foundation (DGF) research grant 1580/5-1. The authors thank the Laboratory of Quantum and Nanoengineering for the use of the TEM and Apl. Prof. Armin Feldhoff for the use of the XRD. Open access funding enabled and organized by Projekt DEAL.

PY - 2023/8/21

Y1 - 2023/8/21

N2 - 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 their melting point without being limited by the boiling point of the solvent, which represents an excellent complement to wet-chemical nanoparticle synthesis. By combining wet-chemical synthesis and postsynthesis laser treatment, the advantages of both methods can be used to specifically control the properties of nanoparticles. Especially in the colloidal synthesis of nanoalloys consisting of two or more metals with different redox potentials, wet-chemical synthesis quickly reaches its limits in terms of composition control and homogeneity. For this reason, the direct synthesis path is divided into two parts to take the strengths of both methods. After preparing Au–Cu hetero nanoparticles by wet-chemical synthesis, nanoalloys with previous adjusted composition can be formed by postsynthesis laser treatment. The formation of these nanoalloys can be followed by different characterization methods, such as transmission electron microscopy (TEM), where the fusion of both metal domains and the formation of spherical and homogeneous Au–Cu nanoparticles can be observed. Moreover, the alloy formation can be followed by different shifts of X-ray diffraction (XRD) reflections and LSPR maxima depending on the composition.

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

KW - composition-control

KW - hetero nanoparticles

KW - laser melting in liquids (LML)

KW - nanoalloys

UR - http://www.scopus.com/inward/record.url?scp=85159684979&partnerID=8YFLogxK

U2 - 10.1002/ppsc.202300021

DO - 10.1002/ppsc.202300021

M3 - Article

AN - SCOPUS:85159684979

VL - 40

JO - Particle and Particle Systems Characterization

JF - Particle and Particle Systems Characterization

SN - 0934-0866

IS - 8

M1 - 2300021

ER -