Journal
ELECTROANALYSIS
Volume 21, Issue 8, Pages 988-993Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200804502
Keywords
Carbon nanotubes; Electroanalysis; Hydrogen peroxide; Titanium dioxide; Sensors
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Funding
- Natural Science Foundation of China [20773041]
- Research Fund for the Doctoral Program of Higher Education [20070561008]
- High Technology Research Program, Ministry of Science and Technology (MOST) of China [2008AA06Z311]
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In this work, in amperometric H2O2 sensor based on TiO2/MWCNTs electrode is reported. TiO2 nanoparticles were synthesized on vertically aligned multiwalled carbon nanotube (MWCNT) arrays by electrodeposition. The Morphology of the TiO2/MWCNTs was characterized by scanning electron microscopy (SEM). The electrochemical performance of the TiO2/MWCNTs electrode for detection of H2O2 was investigated by cyclic voltammetry (CV). differential pulse voltammetry (DPV) and chronoamperometry. The TiO2/MWCNTs electrode displays high electrocatalytic activity towards oxidation of H2O2 in 0.1 M phosphate buffer solution (PBS, pH 7.4). At an applied potential of +0.40 V, the TiO2/MWCNTs electrode exhibits a linear dependence (R=0.998) in the H2O2 concentration up to 15.0 x 10(-3) M with a sensitivity of 13.4 mu A mM(-1) and detection limit of 4.0 x 10(-7) M with signal/noise = 3. The optimal response time is less than 5 s with addition of 1 mM H2O2. The TiO2/MWCNTs electrode presents stable. high sensitivity and also exhibits fast amperometric response to the detection of H2O2. which is promising for the development of H2O2 sensor.
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