Applied Physics A

, Volume 104, Issue 3, pp 963–968

Films of brookite TiO2 nanorods/nanoparticles deposited by matrix-assisted pulsed laser evaporation as NO2 gas-sensing layers

  • A. P. Caricato
  • R. Buonsanti
  • M. Catalano
  • M. Cesaria
  • P. D. Cozzoli
  • A. Luches
  • M. G. Manera
  • M. Martino
  • A. Taurino
  • R. Rella
Article

DOI: 10.1007/s00339-011-6462-5

Cite this article as:
Caricato, A.P., Buonsanti, R., Catalano, M. et al. Appl. Phys. A (2011) 104: 963. doi:10.1007/s00339-011-6462-5

Abstract

Titanium dioxide (TiO2) nanorods in the brookite phase, with average dimensions of 3–4 nm × 20–50 nm, were synthesized by a wet-chemical aminolysis route and used as precursors for thin films that were deposited by the matrix-assisted pulsed laser evaporation (MAPLE) technique. A nanorod solution in toluene (0.016 wt% TiO2) was frozen at the liquid-nitrogen temperature and irradiated with a KrF excimer laser at a fluence of 350 mJ/cm2 and repetition rate of 10 Hz. Single-crystal Si wafers, silica slides, carbon-coated Cu grids and alumina interdigitated slabs were used as substrates to allow performing different characterizations. Films fabricated with 6000 laser pulses had an average thickness of ∼150 nm, and a complete coverage of the selected substrate as achieved. High-resolution scanning and transmission electron microscopy investigations evidenced the formation of quite rough films incorporating individually distinguishable TiO2 nanorods and crystalline spherical nanoparticles with an average diameter of ∼13 nm. Spectrophotometric analysis showed high transparency through the UV-Vis spectral range. Promising resistive sensing responses to 1 ppm of NO2 mixed in dry air were obtained.

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • A. P. Caricato
    • 1
  • R. Buonsanti
    • 2
  • M. Catalano
    • 3
  • M. Cesaria
    • 1
  • P. D. Cozzoli
    • 2
    • 4
  • A. Luches
    • 1
  • M. G. Manera
    • 3
  • M. Martino
    • 1
  • A. Taurino
    • 3
  • R. Rella
    • 3
  1. 1.Department of PhysicsUniversity of SalentoLecceItaly
  2. 2.National Nanotechnology Laboratory (NNL)Istituto di Nanoscienze del CNRLecceItaly
  3. 3.Institute for Microelectronics and MicrosystemsIMM-CNRLecceItaly
  4. 4.Department of Innovation EngineeringUniversity of SalentoLecceItaly