shows the SEM image of the sample grown without the inclusion of In. Quite interesting, it demonstrates that the morphology is similar to pin-like hexagonal nanostructure, with the base diameter in the range of 1–2 µm and the peak diameter in 10–20 nm. With the addition of In in the growth process, the morphology of ZnO nanostructures changes to a wire-like shape as shown in Fig. 1(b)–(d), which is very different from that shown in Fig. 1(a). The diameters and lengths of the nanorods are in the range of 100–300 nm and 1–10 µm. This result indicates that the inclusion of In can drastically alter the growth mechanism and change the morphology of the products. When the weight ratio of the mixed In2S3 and ZnS powder exceeds 0.2, the 1-D nanostructures of ZnO disappear, and are replaced by disordered bulk.