TiO2 films with nanoholes have been prepared by anodic oxidation of a Ti plate in a H2SO4 solution. The TiO2 film sensor equipped with Pd and Ti electrodes exhibited a diode-type current-voltage characteristic in air, but nearly ohmic behavior in H, balanced with dry air. The sensor showed quick response to H-2 in dry air with high sensitivity, especially at 250 degreesC under a reverse bias voltage of 0.1 V. Reversible response to H-2 was also achieved in N-2, while the sensitivity decreased from that in air, The high H-2 sensitivity in air is suggested to arise partly from the change in the height of the Schottky barrier at the interface between Pd and TiO2, and H atoms formed by dissociative adsorption of H-2 at the Pd surface arc assumed to play an important role in the H-2 sensing properties. The sensor was less sensitive to CO, but water vapor interfered with the H-2 sensitivity. (C) 2002 Elsevier Science B.V. All rights reserved.
机构:
Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, ItalyUniv Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
Traversa, E
Villanti, S
论文数: 0引用数: 0
h-index: 0
机构:Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
Villanti, S
Gusmano, G
论文数: 0引用数: 0
h-index: 0
机构:Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
Gusmano, G
Aono, H
论文数: 0引用数: 0
h-index: 0
机构:Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
Aono, H
Sadaoka, Y
论文数: 0引用数: 0
h-index: 0
机构:Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
机构:
Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, ItalyUniv Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
Traversa, E
Villanti, S
论文数: 0引用数: 0
h-index: 0
机构:Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
Villanti, S
Gusmano, G
论文数: 0引用数: 0
h-index: 0
机构:Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
Gusmano, G
Aono, H
论文数: 0引用数: 0
h-index: 0
机构:Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy
Aono, H
Sadaoka, Y
论文数: 0引用数: 0
h-index: 0
机构:Univ Roma Tor Vergata, Dipartimento Sci & Tecnol Chim, I-00133 Rome, Italy