Figure 1: TEM characterizations and crystal structure of VO2(B) at ambient pressure.

(a) Bright field TEM images of VO2(B) nanosheets. Scale bar, 2 μm. (b) Selected-area electron diffraction of VO2(B) nanosheets along the [010] zone axis showing its single crystal nature. Scale bar, 5 nm−1. (c) Crystal structure of VO2(B) showing a dense packed vanadium–oxygen layer in the bc plane and ac plane with hierarchical V–O bonding. The O1 atoms with shortest V=O bonds are highlighted in green.