Fig. 6: Reversible change of nanohelices.
From: Twisting, untwisting, and retwisting of elastic Co-based nanohelices
a XRD patterns of the samples kept under different external conditions. Inset: changes in the d-spacing of the strongest diffraction peak. Sample 1: as-synthesized nanohelices; Sample 2: Sample 1 kept in ethanol at room temperature for 24 h and then dried naturally; Sample 3: Sample 2 kept in ethanol solution and then dried in 80 °C oven for 3 h; Sample 4: Sample 3 kept in ethanol at room temperature for 24 h and then dried naturally; b crystal lattice transformation schematic of a nanohelix with the stated external conditions; c mutual transformation processes between the nanowires and nanohelices.
