Zahedi - Nanotechnology group, Material engineering department, Tarbiat modares university
Shojaosadati - Nanotechnology group, Material engineering department, Tarbiat modares university, Biotechnology group, Chemical engineering department, , Tarbiat modares university
Ghourchian - Institute of Biochemistry and Biophysics (IBB), Science department, Tehran university

The electrochemical activity of fore different carbon nanotube modified graphite electrodes, treated and functionalized with two methods has been assessed and compared. These treatment attaches COOH and OH groups to the multi-walled carbon nanotube (MWCNT). The amperometric thiocholine detection on MWCNT modified electrode at +750 mV enhance sensitivity about 37% and 22% compared to bare electrode and electrode modified with pristine CNT respectively and increase linear range 2.5 *10-3 to 2.7*10-3 in bare electrode to 1.6*10-4 to 3*10-3 in electrode modified with functionalized CNT.

Multi-walled carbon nanotube, electrochemical properties, thiocholine, functionalized carbon nanotube