Figure 6
Two-dimensional-grazing incidence diffraction profiles of TCB-treated P3HT taken in two different orientations: (a) the direction of the fibers is parallel to the X-ray beam; (b) the direction of the fibers is vertical to the X-ray beam. (c) 1D diffraction profile with respect to the out-of-plane (along the qz) direction extracted from the 2D-GIXRD results. The specular X-ray diffraction pattern contains almost the same Bragg diffraction peaks in both directions, which correspond to a d-spacing of 15.8 Å (200), 11.8 Å (300), 7.5 Å (400) and 3.8 Å (010). (d) 1D diffraction profile with respect to the in-plane (along the qxy) direction extracted from the 2D-GIXRD results. When the fibers are vertical to the direction of the X-ray beam, the in-plane reflection peaks are much stronger at a d-spacing of 15.8 and 3.8 Å than those when the fiber axis is parallel to the X-ray beam, showing remarkable anisotropy in molecular alignment.
