SEM images of the nanospheres and their quantitative size distribution. (a) An image of the nanospheres (SEM). (1) A nanosphere without a shell. (2) A nanosphere with the attached CNTs (might be covered with a shell), and (3) the nanospheres beading the CNT bundles. (b) Representative grouping of the nanospheres. (c) Corresponding size distribution.
Labunov et al. Nanoscale Research Letters 2013 8:375 doi:10.1186/1556-276X-8-375