The Platinization of Graphite Composites Turns Widespread and Low-Cost Materials into Hydrogen Peroxide Sensors and High-Value Biosensor Transducers

Electrochemical microsensors and biosensors have been widely used in many fields, particular neurochemical monitoring, because of their features. Usually, hydrogen peroxide (HP), obtained as a by-product an enzymatic reaction, is the detected compound on transducers made precious metals, platinum. The over-time increase price platinum its alloys requires use miniaturizable low-cost supports that can be suitably modified with deposition Pt particles; among them, graphite most widespread. In present paper, carbon-composition resistors (CCRs) pencil leads (PLs) different diameters (0.3, 0.5 2.0 mm), mainly up graphite, clay some other components were carbonaceous support for Platinizations carried out by means cyclic voltammetry (CV) constant potential amperometry (CPA) techniques. On platinized supports, (HP) ascorbic acid (AA) sensitivity assessed order to verify possibility using them amperometric biosensors. All protocols determined occurrence HP not appreciable surfaces. We chose 0.3 mm Ø PLs construction glucose appropriately modifying surface layering, permselective polymer, enzyme booster, oxidase (GOx) containing network. biosensor constructed this way demonstrated behavior comparable classic wires.