Flexible electrochemical biosensors based on O-2 plasma functionalized MWCNT

Abstract

A flexible glucose sensor is fabricated using O-2 plasma-functionalized multiwalled carbon nanotube (MWCNT) films on polydimethylsiloxane (PDMS) substrates and its performance is electrochemically characterized. After enzyme immobilization, the GOD/MWCNT/Au/PDMS electrode exhibits a sensitivity of 18.15 mu A mm(-2)mM(-1) and a detection limit of 0.01 mM (signal to noise ratio was about 3). This high sensitivity may be attributed to a large enzyme loading and a higher electrocatalytic activity and electron transfer exhibited by O-2 plasma-functionalized CNTs than the pristine CNT, due to some oxygen-contained groups present on the O-2 plasma-functionalized CNT surface, which has been verified by XPS spectrum. (C) 2009 Elsevier B.V. All rights reserved.