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(a) SEM image of the Au@Ag/3D-Si sample (insert: EDX data of the Au@Ag/3D-Si). (b,c) are respectively the size and size distribution of the Au@Ag. (d,e) are TEM of the obtained Au@Ag. (f) SEM image of the Au/3D-Si (the left region) and Au@Ag/3D-Si (the right region).
