Portal de Periódicos da CAPES

Electrodeposition of TiO 2 Nanoparticles on Multiwalled Carbon Nanotube Arrays for Hydrogen Peroxide Sensing

2009; Wiley; Volume: 21; Issue: 8 Linguagem: Inglês

10.1002/elan.200804502

1521-4109

Liao‐Chuan Jiang, Wei‐De Zhang,

Analytical Chemistry and Sensors

Abstract In this work, an amperometric H 2 O 2 sensor based on TiO 2 /MWCNTs electrode is reported. TiO 2 nanoparticles were synthesized on vertically aligned multiwalled carbon nanotube (MWCNT) arrays by electrodeposition. The morphology of the TiO 2 /MWCNTs was characterized by scanning electron microscopy (SEM). The electrochemical performance of the TiO 2 /MWCNTs electrode for detection of H 2 O 2 was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry. The TiO 2 /MWCNTs electrode displays high electrocatalytic activity towards oxidation of H 2 O 2 in 0.1 M phosphate buffer solution (PBS, pH 7.4). At an applied potential of +0.40 V, the TiO 2 /MWCNTs electrode exhibits a linear dependence ( R =0.998) in the H 2 O 2 concentration up to 15.0×10 −3 M with a sensitivity of 13.4 μA mM −1 and detection limit of 4.0×10 −7 M with signal/noise=3. The optimal response time is less than 5 s with addition of 1 mM H 2 O 2 . The TiO 2 /MWCNTs electrode presents stable, high sensitivity and also exhibits fast amperometric response to the detection of H 2 O 2 , which is promising for the development of H 2 O 2 sensor.