Void Structures in Regularly Patterned ZnO Nanorods Grown with the Hydrothermal Method

Figure 3

(a) Cross-sectional TEM image of an as-grown undoped ZnO NR sample. (b)–(e): Cross-sectional TEM images of undoped ZnO NRs after thermal annealing with ambient oxygen for 60 min at 200, 300, 400, and 500°C, respectively. The ZnO NRs are grown under the standard condition.