Figure 2

Force-distance profiles between ss-DNA layer and bare mica in 1 mmol/L CoCl2 with different DNA concentrations: 25 (triangle), 50 (diamond), 100 ng/μL (circle)
Force-distance profiles between ss-DNA layer and bare mica in 1 mmol/L CoCl2 with different DNA concentrations: 25 (triangle), 50 (diamond), 100 ng/μL (circle)