In this thesis three-dimensional tube-shaped DNA-origamis were dielectrophoretically trapped within lithographically fabricated nanoelectrodes. The origamis had been premade while the electrodes were fabricated specifically for these experiments with two different gapsizes, 150 nm and 400 nm. The aim of the work was to capture individual nanotubes in the gap between the electrodes by utilizing the dielectrophoretic forces present in the structure when a solution containing the origamis was put onto the electrodes and a voltage was applied. It was observed during the experiments that the success of the dielectrophoretic trapping depended strongly on the trapping conditions. This caused the trapping to be somewhat challenging and it was also noticed that the electrode structure with the 400 nm gap particularly required patience in order to produce good results, since the origamis to be trapped were of the same size as the gap between the electrodes making the successful trapping problematic. Despite this, a sufficient amount of trapped single nanotubes were produced.