title: Cu-Ni nano-alloy: mixed, core-shell or Janus nano-particle?
abstract: Bimetallic nanoparticles like Cu-Ni are particularly attractive due to their magnetic and catalytic properties; however, their properties depend strongly on the structure of the alloy i.e. mixed, core-shell or Janus. To predict the alloy structure, this paper investigates the size and shape effects as well as the surface segregation effect on the Cu-Ni phase diagram. Phase maps have been plotted to determine the mixing/demixing behavior of this alloy according the particle shape. Cu-Ni nanoalloy can form a mixed particle or a Janus one depending on the synthesis temperature. Surface segregation is also considered and reveals a nickel surface-enrichment. Finally, this paper provides a useful roadmap for experimentalists.
authors.affiliation: Department of Physics & Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, USA. gregory.guisbiers@physics.org.
authors.forename: Grégory
authors.initials: G
authors.lastname: Guisbiers
authors.forename: Subarna
authors.initials: S
authors.lastname: Khanal
authors.forename: Francisco
authors.initials: F
authors.lastname: Ruiz-Zepeda
authors.forename: Jorge
authors.initials: J
authors.lastname: Roque de la Puente
authors.forename: Miguel
authors.initials: M
authors.lastname: José-Yacaman
mesh_terms: D003198:Computer Simulation; D003300:Copper / Q000737:chemistry*; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D008956:Models, Chemical; D008958:Models, Molecular; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D044367:Phase Transition; D013499:Surface Properties; D013696:Temperature
chemical_list: C062136:nickel copper alloy; D003300:Copper; D009532:Nickel