Stretchable single-walled carbon nanotube double helices derived from molybdenum-containing layered double hydroxides

Single-walled carbon nanotube (SWCNT) double helices were fabricated with directly synthesized FeMoMgAl layered double hydroxide flakes as the catalyst precursor. The as-obtained SWCNT double helices were closely packed, while the screw pitches of the double helices were tunable from 2 to 10 μm. Straight millimeter-length SWCNT yarns can be obtained by further stretching the SWCNT double helices.