SEM images of as-synthesized ZnO nanowires. (a) Low-magnification, (b) aligned ZnO nanowires and (c) its larger-magnification Figure 4a shows the typical low-magnification TEM image of the prepared ZnO nanowire, which indicates that the ZnO nanowire has a uniform diameter of 45 nm. The as-prepared ZnO nanowire was further analyzed with HRTEM, as shown in Figure 4b. The measured spacing of lattice fringes is 0.52 nm, corresponding to the d-spacing of the (0001) planes of wurtzite ZnO. Based on the HRTEM image of the nanowire, no stacking faults and dislocations are observed. This reveals the well-crystalline nature of ZnO nanowire. In this work, highly crystalline ZnO nanowires are synthesized in the absence of a catalyst.
Liu et al. Nanoscale Research Letters 2012 7:220 doi:10.1186/1556-276X-7-220