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TEM images of (a) ~30nm Au (b) ~30nm Au/~40nmSiO2 (c) ~40nmAu/~40nmSiO2/~10nmY2O3:Yb3+,Er3+ (the insert is HRTEM image of lattice fringes of the Y2O3:Yb3+, Er3+ layer) (d) EDX in a selected area of Au core and (e) XRD patterns of discussed samples (* represents Au diffraction peaks).
