Fig. 3From: Free-standing millimetre-long Bi2Te3 sub-micron belts catalyzed by TiO2 nanoparticlesTime dependence of the growth. SEM images of two samples grown for a 4 h and b 8 h. The number of small platelets and the width of Bi2Te3 belts increase with growth time; however, the average length does not change significantlyBack to article page