“…It was also reported that spherical bismuth nanomaterials were a good catalyst for the growth of SnS 2 nanotubes and germanium nanowires [ 21 , 22 ]. Up to now, a wide variety of bismuth nanostructures such as nanoparticles [ 23 ], nanowires [ 24 ], nanorods [ 25 ], nanotubes [ 26 - 28 ], triangular nanoplates [ 29 ], bunch-like nanostructures [ 17 ], nanocubes [ 30 ], as well as nanospheres (>100 nm) [ 31 - 34 ] have been prepared by using different methods. Among these methods, solvothermal synthesis has become an important and promising approach to prepare controlled inorganic nanocrystals [ 35 - 37 ].…”