Fig. 3.

L1₁@Ag-skin nanoparticle. a–d High-resolution STEM-HAADF image of a 2.8 nm NP in the [01$\overline{1}$] zone axis with its corresponding intensity profile lines. e–h, i–l and m–p show the model 1, 2, and 3 in the [01$\overline{1}$] zone axis, respectively, with their corresponding intensity profile lines. The intensity profiles were done for three different locations: along the (1$\overline{1}\overline{1}$) plane close to the centre of the NP (AA′), along the (1$\overline{1}\overline{1}$) plane at the NP surface (BB′) and along the (100) plane at the NP surface (CC′). STEM-HAADF high angle annular dark field in scanning transmission electron microscope, NP nanoparticle