Highly Sensitive and Selective Glucose Sensor Realized by Conducting Polymer Modified Nanoporous PtZn Alloy Electrode

Abstract

:Platinum is a well known element which shows a significant electrocatalytic activity in many important applications. In glucose sensor, because of the poisoning effect of reaction intermediates and the low surface area, the electrocatalytic activity towards the glucose oxidation is low which cause the low sensitivity. So, we fabricate a nanoporous PtZn alloy electrode by deposition-dissolution method. It provides a high active surface and a large enzyme encapsulating space per unit area when it used for an enzymatic glucose sensor. Glucose oxidase was immobilized on the electrode surface by capping with PEDOT composite and PPDA. The composite and PPDA also can exclude the interference ion such as ascorbic acid and uric acid to improve the selectivity. The surface area was determined by cyclic voltametry method and the surface structure and the element were analyzed by Scanning Electron Microscope (SEM) and Energy Dispersive X-ray spectroscopy (EDX), respectively. The sensitivity is 13.5 µA/mM cm 2 . It is a remarkable value with such simply prepared senor has high selectivity.

A Poly(trypan blue)-Modified Anodized Glassy Carbon Electrode for the Sensitive Detection of Dopamine in the Presence of Uric Acid and Ascorbic Acid

“…[10][11][12][13][14] Electrodes modified with conducting polymers (CPs) are widely used for the electrochemical detection of DA in the presence of UA and AA. 15,16 CPs films offer the advantages of chemical stability and the feasibility of selectivity/sensitivity control and they can be deposited electrochemically onto conventional electrode surfaces in a homogeneous fashion. 17,18 Among the conventional electrodes, GCE is a stable and robust carbon-based electrode, has been widely used as substrate for the modification with CPs.…”