Fig. 1 Synthesis and characterizations of CuPd alloy nanoparticles. a – c TEM images of CuPd TNP-1 ( a ), TNP-2 ( b ) and SNP ( c ). d Size distribution of CuPd nanoparticles in aqueous solution as measured by dynamic light scattering (DLS). e Zeta potential of CuPd nanopartcles in aqueous solution. f Different Cu and Pd contents in CuPd nanoparticles revealed by EDS spectra. g The UV-Vis spectrum of CuPd nanoparticles in aqueous solution. h The temperature changes of CuPd nanoparticles irradiated by 808 nm NIR laser at a power density of 1 W cm 2 ^-1 for 5