Figure 2

(a) and (e) TEM images of undoped and Zn-doped SnO₂; (b, f) HRTEM images of undoped and Zn-doped SnO₂ with their SAED pattern (c, g)); (d, h) EDX spectra of undoped and Zn-doped SnO₂.

Undoped (S1 600°C) and Zn-doped SnO₂ (S2 600°C). The peaks of Cu and C observed in the EDX spectrum are from carbon-coated copper grids.