Electrodeposition of TiO2 Nanoparticles on Multiwalled Carbon Nanotube Arrays for Hydrogen Peroxide Sensing

✍ Scribed by Liao-Chuan Jiang; Wei-De Zhang

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 290 KB
• Volume: 21
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200804502

✦ Synopsis

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.