The mushroom-structure was occasionally observed, but we showed it is an artifact of drying; as improved dispersion sufficed to break them apart and reveal the presence of rods. This result is also in accordance with the TEM studies done with carbon nanotubes (Boccaccini, et al. 2006; Wang, et al. 2000) and various types of inorganic nanoparticles, such as ZnO (Hu, et al. 2010) and Au nanoparticles (Westcott, et al. 1998), where the importance of dispersion of the sample is stressed while imaging these nanoparticles.