Pd decahedron and PD-FA NP morphological characteristics were assessed via transmission electron microscopy (TEM; Tecnai G2 F20 S-Twin, FEI, United States) at an acceleration voltage of 100 keV. Surface chemical elements were analyzed via XPS (ESCA-Lab250XI, Thermo Fisher Ltd., United States). The zeta potential and zeta-diameter measurements were quantified based upon dynamic light scattering (DLS, Nano-Zen 3,600, Malvern Instruments, United Kingdom).
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