412 Engineering of Polymers and Chemical Complexity
electron transfer and facilitate the electron transfer through the conducting tunnels of
colloidal gold[86], [161]. They can act as an electron-conducting pathway between
prosthetic groups and electrode surface. Gold nanoparticle-modified electrode sur-
faces can be prepared in three ways: (a) by binding gold nanoparticles with functional
groups of self-assembled monolayers (SAMs); (b) by direct deposition of nanopar-
ticles onto the bulk electrode surface; (c) by incorporating colloidal gold into the elec-
trode by mixing the gold with the other components in the composite electrode matrix.
The effect of gold nanoparticles (50-130 nm in diameter) on the response of ty-
rosinase based biosensor ...