Supplementary. respectively.

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1 Figure S1. HAADF STEM images of Ag NRod interacting with Au NP (a and b) and Au NRod with Ag NP (c and d). Interface areas are labeled with ellipse. Itt can be seen thatt when interface was oriented parallel to the electron beam, a sharp contrast transition across the interface was observed. Alloying, i.e. atomic intermixing is expected to make the t interface appearance smooth in HAADF STEM image. Therefore we w concluded that merging of Au and Ag NPs was not accompanied by an alloying. HAADF STEM S image of merging between Au NRod and Ag NP (e) and thee EDS line scan acquired along the line 1 shown on the image (f). Blue and red lines are related to X Ray photons of Ag K and Auu M series, respectively.

2 Figure S2. These TEM images preset a projected straight profile that represented an initially flat atomic face of Ag NRod (a) with the flat f projectedd parallel edges labeled by the black line. In due course of merging the projectedd profile of the rod significantly changed in spite of the samee projection angle (b). Namely: i) instead of a single straight profile we observe two t edges (shown in black lines); ii) the lower darker edge appears less curved, but the upper lighter one appears as an ark with the estimated radius of curvature of 50 nm.

3 Figure S3. The red square shows the scanned region at which we collected EDS maps of Ag K (left) and Au M (right) series.

4 Figure S4. Snapshots at molecular dynamics time 10 33ns, the diameter of the dot and rod vary between 7 to 2.3 nm. The red arrow indicates the wetting and welding events in the Ag dot/au rod and Au dot/ /Ag rod structures. Both the Au and Ag rods are <111> exposure. The bottom centered image presents an example of nanoparticles with decahedron shape.

5 Figure S5. (a) RDF plot for the structure with d=3nm, D=5nmm respectively, the simulation time is 10ns. hcp dislocation marked in pink, the dot d part represents the hcp in Silver part, From the RDF we can see in the central part, some Ag and Au atoms are mixing. (b) RDF plot for the structure s with d=5nm, D=5nm respectively, the simulation time is 10ns. (c) Statistical angle distribution plot for the silver wettingg cases.

6 Figure S6. (a) Side and cross sectional views for the contact made of gold NPs and silver rods. The silver rods are bound with {111} and {110}, respectively. The pink (with black dots) balls represent the stacking faults in gold (silver) nanomaterials. (b) The stacking faults in the merged Au and Ag NPs. The pair of green lines notifies a faulty sequence of atomic planes in AuNRod aligned with the same structural fault in AgNP (the red pair of lines).

7 Figure S7. (a and b) For justification of the potential, we found that this set s of EAM potential reproduces experimental data with good agreement on lattice parameters, bulk modulus, cohesive energy, elastic constants, sublimation energies, and heats of solution. Also, we have performed benchmark on phonon band structures s and elastic constants calculations for both Ag and Au bulks, to further checkk the quality of EAM potential used in this work ( Dong, H.; Moon, K. S.; Wong, C. P.; Ieee, Molecular dynamicss study on coalescence of silver (Ag) nanoparticles and their deposition on goldd (Au) substrates. 2004; p ). (c) Comparison with C.P. Wong s work w in a (400K) and b (1000K) (Dong, H.; Moon, K. S.; Wong, C. P.; Molecular dynamicss study on coalescence off silver (Ag) nanoparticles and their deposition on gold (Au) substrates. J. Electronic Mater. 34, 40 (2004)). a and b are from our simulations at 400K and 1000K, respectively.