Fig. 4From: Free-standing millimetre-long Bi2Te3 sub-micron belts catalyzed by TiO2 nanoparticlesMillimetre-long sub-micron belt. a SEM image of a free-standing Bi2Te3 belt. b EDX analysis shows the composition to be stoichiometric Bi2Te3. c AFM image of the long Bi2Te3 belt, with the height profile in red, showing a thickness of 430 nm and a width of 4 μm, i.e. an aspect ratio of thickness to width of ∼1:10Back to article page