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Fig. 1. (a)–(d) TEM of SiO2–NH2, SiO2@gold seed, SiO2@gold shell and SiO2@Au@MnO2. Inset: the HR-TEM of SiO2@Au@MnO2. (e)–(g) The corresponding elemental mappings of SiO2@Au@MnO2 (e) Au, (f) Mn, (g) O, (h) the energy dispersive spectrum of SiO2@Au@MnO2. Scale bar: 200 nm.