Fig. 1

Morphological characteristics and conductivity of CNH-Col. From left to right: a TEM images of pristine CNH aggregates, 0.05 mg/ml CNH-Col conjugate, and high-magnification TEM image of CNH aggregates coated by collagen molecules; b AFM images showing the surface roughness of collagen and 0.05 mg/ml CNH-Col substrates (10 μm × 10 μm); and c conductivity and cyclic voltammetry curves of collagen and CNH-Col. Data are means ± SDs, n = 3