The present invention relates to biocompatible composites, in particular biocompatible nanotube composites in the form of a fiber mat and/or film structure, comprising nanotubes and at least one biomolecule. The invention also relates to a process for preparing a biocompatible composite involving (i) forming a dispersing media comprising nanotubes and at least one biomolecule; and either (ii) introducing the dispersing media of step (i) into a coagulating media optionally comprising at least one biomolecule so as to form a continuous fiber; or (iii) filtering the dispersing media of step (i). Alternatively, the process involves (i) forming a dispersing media comprising nanotubes; and (ii) introducing the dispersing media of step (i) into a coagulating media comprising at least one biomolecule so as to form a continuous fiber. The biocompatible composite is useful as a medical device, preferably in a bio-electrode, bio-fuel cell or substrates for electronically stimulated bio-growth.