Fullerene (C60) functionalized TiO2 nanotubes for conductometric sensing of formaldehyde

Teena Gakhar, Yossi Rosenwaks, Arnab Hazra

Research output: Contribution to journalArticlepeer-review

Abstract

In the current study, fullerene-C60, functionalized with various oxygen-containing groups, was decorated on a highly oriented electrochemically grown TiO2 nanotubes array for efficient detection of volatile organic compounds (VOCs) like formaldehyde. Concentrations of C60 were varied to prepare different wt% (0.006, 0.01, 0.02 and 0.05) of fullerene water colloidal systems, which were then used to prepare composite with TiO2 nanotubes by hydrothermal route. Detailed characterizations were performed to assess the morphology, structure and chemical compositions of the developed nanocomposites. BET analysis was performed to estimate the increased effective surface area due to the inculcation of the fullerene clusters of different sizes to the TiO2 nanotube surface. C60-TiO2 nanotubes composite showed natural selectivity towards formaldehyde. Ultra-high sensitivity (99.6%) by 0.05 wt% C60-TiO2 nanotube and very fast response/recovery (4 s/7 s) by 0.02 wt% C60-TiO2 nanotube were recorded towards 100 ppm of formaldehyde at 150 °C. The sensors covered the maximum detection range was 100 ppm to 100 ppb. However, highly promising VOCs detection was possible due to the enhanced surface area and high reactive surface provided by the C60-TiO2 nanotube composites.

Original languageEnglish
Article number131892
JournalSensors and Actuators B: Chemical
Volume364
DOIs
StatePublished - 1 Aug 2022

Keywords

  • C-TiO nanotubes
  • Fast response
  • Formaldehyde sensing
  • High surface reactivity
  • Ppb level detection
  • Ultra-high sensitivity

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