Fig. 2: Characterization of PEDOT: PSS films with varying degrees of phase separation.
From: Highly conductive polymer with vertical phase separation for enhanced bioelectronic interfaces
a, b AFM phase images (a), corresponding orientation mapping analysis (b), and pole figures of the fibril orientation distribution (bottom). The color map of fiber orientation ranges from 0° (red), 90° (cyan), to 180° (magenta), with the white arrow indicating the coating direction. Scale bars: 200 nm. c–e The depth profiles of PEDOT: PSS films include a schematic diagram (left) illustrating the distribution of PEDOT and PSS polymers, the atomic composition (middle), and the PSS-to-PEDOT ratio (right). These profiles are obtained using XPS ionic cluster gun sputtering, with S (2p) core levels measured as a function of etch cycles. f, g Molecular dynamics analysis about the interfacial adsorption energy between PEDOT: PSS film with different PSS-to-PEDOT ratio and the tissue and the calculated adsorption energy. h Contact angles of 0.1 M NaCl solution on different films. i Two-dimensional grazing incidence wide-angle X-ray scattering (GIWAXS) patterns for PEDOT: PSS films. j, k The vertical and horizontal GIWAXS profiles of films, where qxy and qz are the perpendicular and parallel wave vector transfers with respect to sample surface, respectively.
