Electron microscopy and holography on nano structures: Nano tubes and rods, organic solar cells and biomimetic solid composites

摘要

Nano tubes and rods By interacting with the object and its magnetic or electric field, the phase of the electron wave experiences a shift. Thus, electric and magnetic fields can be imaged by means of electron holography. A magnetic field gives rise to a phase shift which is proportional to the magnetic flux, F{sub}m, enclosed between the paths of interfering electrons. In this way, it is possible to image magnetic micro-fields inside as well as stray fields outside the sample. As an example, the magnetic phase distribution of a carbon nanotube filled with nickel particles is shown in (Fig. 1a). For the sake of comparison, the amplitude micrograph (Fig. 1b) corresponding to the conventional TEM is presented.