Nanostructured Surface by Self-Assembly of Carbon Nanotubes for Bio-Analysis

抄録

A nanostructured surface was designed and created by synthesizing Carbon Nanotubes (CNTs) on a plane substrate. Multi-walled carbon nanotubes (MWNTs) were synthesized on a Si/SiO2 substrate by alcohol catalytic chemical vapor deposition (ACCVD). The MWNTs were vertically synthesized on the surface, and the structure and characteristics of the surface, such as wettability, were evaluated. The surface with the MWNTs was also treated by coating with Au and subsequent plasma irradiation, in order to change the wettability from hydrophobic to hydrophilic. The results of wettability tests show that the surface with the MWNT film behaved as a super-hydrophobic surface before coating with Au and plasma irradiation, but behaved as a super-hydrophilic surface after coating with Au and plasma irradiation. Furthermore, experiments using water droplets on the MWNTs and subsequent drying was carried out, and the resulting changes in the structure and characteristics of the MWNTs were evaluated using scanning electron microscopy (SEM). The MWNTs subjected to plasma irradiation were found to clump together forming bundles after dropping water and drying; we found that the CNTs moved after the water was dropped on them. These results show that highly dense CNTs with self-assembled structures can be realized for potential applications as microreactors.