Te oxide nanowires as advanced materials for amperometric nonenzymatic hydrogen peroxide sensing.
A new nonenzymatic platinum Te oxide nanowires modified electrode (Pt/TeO2-NWs) for amperometric detection of hydrogen peroxide (H2O2) is proposed. The modified electrode has been developed by direct drop casting, with TeO2 nanowires (TeO2-NWs), synthesized by thermal evaporation of Te(0) in an oxygen atmosphere. The morphological and spectroscopic characterization of the TeO2-NWs as synthesized on Pt foil was performed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. XPS and XRD analyses are especially involved to gain information on the chemical environment of TeO2-NWs in contact with Pt surface. Moreover electrochemical characterization of these new modified Pt/TeO2-NWs modified electrodes was performed by Cyclic Voltammetry (CV) and Cronoamperometry (CA) in phosphate buffer (pH=7; I=0.2) to investigate the sensing properties of this material against H2O2. The proposed sensor exhibits a wide linear and dynamic range from 2 µM to 16 mM (R(2)=0.9998) and the detection limit is estimated to be 0.6 µM (S/N=3). Moreover, this sensor shows a rapid amperometric response time of less than 5s and possessed good reproducibility. These results indicate that Pt/TeO2-NWs composite is suitable to be used as material for sensing applications.
Department of Di.S.Te.B.A., University of Salento, Via Monteroni, 73100 Lecce, Italy. Electronic address: maria.rachele.guascito@unisalento.it.
Maria Rachele
MR
Guascito
Daniela
D
Chirizzi
Cosimino
C
Malitesta
Tiziana
T
Siciliano
Antonio
A
Tepore
D002021:Buffers; D055664:Electrochemical Techniques; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D053770:Nanowires / Q000737:chemistry* / Q000648:ultrastructure; D056951:Photoelectron Spectroscopy; D010984:Platinum / Q000737:chemistry*; D015203:Reproducibility of Results; D013691:Tellurium / Q000737:chemistry*
D002021:Buffers; C016774:tellurium dioxide; D010984:Platinum; D006861:Hydrogen Peroxide; D013691:Tellurium
Amperometric sensor; H(2)O(2) detection; Nonenzymatic; TeO(2) nanowires