Figure 2From: Field emission characteristics of zinc oxide nanowires synthesized by vapor-solid processCross-sectional and top-view FESEM images of ZnO NWs grown at different growth times. (a, d) NWs grown for 60 min, (b, c, e, f) from a Zn source at 550C for (a) 60 min (b) 90 min, and (c) 120 min of reaction times.Back to article page