Optical and electrochemical properties of single-walled carbon nanotube arrays attached to silicon(100) surfaces

摘要

Arrays of aligned single-walled carbon nanotubes (SWCNTs) have been attached to a Si (100) surface using two approaches. The first method uses a self-assembled ethyl undecanoate monolayer (SWCNTs-SAM structure), while the second sees the nanotubes attached directly to an ultrathin SiO2 layer (SWCNTs-SiO2 structure). The optical and electrochemical properties of two nanotube arrays were compared by fluorescence spectroscopy and cyclic voltammetry. The results show that the SWCNTs-SiO2 structure has strong coupling between the attached SWCNTs and the silicon substrate, but the coupling gets smaller with increasing size of attached SWCNT bundles. The SWCNTs-SAM structure shows poor conductivity and electrochemical reversibility. The SWCNTs-SiO2 structure does appear to be a very useful substrate for use in further applications.