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Free energy surface (FES) characterization of the intra-strand hydrogen bonds for ssDNA on a (6,5) SWCNT: (a) One strand (TAT)4 (b) Two strands (TAT)4 (c) Three strands (TAT)4 (d) Four strands (TAT)4 (f) Four strands TTA(TAT)2ATT (g) Four strands C12 (h) Six strands (GTC)2GT. The dashed line denotes the center of the nanotube wall. The presence of HBs in the circled regions indicate HBs that have stabilizing character.
