1. Introduction of nanocomposites in electrochemical sensors -- 2. Literature review of nanocomposites in electrochemical sensors -- 3. Experimental procedures and materials for nanocomposites in electrochemical sensors -- 4. Electrocatalytic detection of glucose using cobalt (II) ions immobilized ZnO/MWCNT/PCL nanocomposite film -- 5. Sensitive detection of L-tryptophan using gelatin stabilized anatase titanium dioxide nanoparticles -- 6. Electrocatalytic detection of carbohydrates by using Ni(II)/PAN/MWCNT nanocomposite thin films -- 7. Simultaneous detection of D-penicillamine and L-tryptophan using ferri/ferrocyanide doped chitosan-multi walled carbon nanotube nanocomposite -- 8. Outlook of nanocomposites in electrochemical sensors.