Abstract
Mesoporous MnO 2 (mesoMnO 2) is synthesized facilely through sol–gel process using nonionic surfactant polyxyethylene fatty alcohol (AEO 9) as template. Transmission electron microscopy (TEM) image and N 2 adsorption/desorption isotherm show that the obtained mesoMnO 2 material presents disordered porous structure and appropriate pore size suitable for the immobilization of glucose oxidase (GOx). An amperometric glucose biosensor based on GOx entrapped in mesoMnO 2 is fabricated, in which mesoMnO 2 also acts as a catalyst for the electrochemical oxidation of H 2O 2 produced by enzyme reaction. The biosensor shows fast and sensitive current response to glucose in the linear range of 0.0009–2.73 mM. The response time ( t 95%) is less than 7 s. The sensitivity and detection limit are 24.2 μA cm −2 mM −1 and 1.8 × 10 −7 M ( S/ N = 3), respectively. This indicates that mesoMnO 2 has promising application in enzyme immobilization and biosensor construction.
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