β-Cyclodextrin–Graphite Oxide–Carbon Nanotube Composite for Enhanced Electrochemical Supramolecular Recognition

The β-cyclodextrin–graphite oxide–carbon nanotube (βCD–GO–CNT) composite was synthesized by a simple chemical method and characterized for the supramolecular recognition by using the cyclic voltammetry and differential pulse voltammetry. Three kinds of biomolecules (dopamine, thioridazine, l-tyrosine) were used, and βCD–GO–CNT composite presented excellent capability for supramolecular recognition of the biomolecules compared to individual CNT and βCD–CNT composites, exhibiting the presence of GO in the βCD–GO–CNT composite could immobilize βCD molecules effectively. It is, therefore, demonstrated that the new composite, βCD–GO–CNT, provides a synergistic effect of high electric conductivity from CNT and high supramolecular recognition capability from βCD effectively immobilized in GO for future biosensor applications.