Gas sensing at the nanoscale: Engineering SWCNT-ITO nano-heterojunctions for the selective detection of NH3 and NO2 target molecules

Stefania Pagliara, Luigi Ermenegildo Sangaletti, Federica Rigoni, Giovanni Drera, Chiara Pintossi, Andrea Goldoni, A. Goldoni

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The gas response of single-wall carbon nanotubes (SWCNT) functionalized with indium tin oxide (ITO) nanoparticles (NP) has been studied at room temperature and an enhanced sensitivity to ammonia and nitrogen dioxide is demonstrated. The higher sensitivity in the functionalized sample is related to the creation of nano-heterojunctions at the interface between SWCNT bundles and ITO NP. Furthermore, the different response of the two devices upon NO2 exposure provides a way to enhance also the selectivity. This behavior is rationalized by considering a gas sensing mechanism based on the build-up of space-charge layers at the junctions. Finally, full recovery of the signal after exposure to NO2 is achieved by UV irradiation for the functionalized sample, where the ITO NP can play a role to hinder the poisoning effects on SWCNT due to NO2 chemisorption.
Original languageEnglish
Pages (from-to)N/A-N/A
Number of pages7
JournalNanotechnology
Volume28
DOIs
Publication statusPublished - 2017

Keywords

  • Bioengineering
  • Chemistry (all)
  • Electrical and Electronic Engineering
  • ITO nanoparticles
  • Materials Science (all)
  • Mechanical Engineering
  • Mechanics of Materials
  • ammonia gas sensing
  • carbon nanotubes
  • gas sensing
  • heterojunction
  • indium tin oxide nanoparticles
  • nano-heterojunction

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