Cr-doped TiO2 gas sensor for exhaust NO2 monitoring

Ana M. Ruiz, Go Sakai, Albert Cornet, Kengo Shimanoe, Joan Ramon Morante, Noboru Yamazoe

Research output: Contribution to journalConference article

206 Citations (Scopus)

Abstract

A set of Cr-highly doped TiO2 samples with Cr contents ranging from 5 to 30 at.% were prepared in a sol-gel route and calcined at a temperature between 600 and 900 °C. X-ray diffraction (XRD) analyses revealed the persistence of anatase phase up to the calcination temperature of 700 °C in all samples, above which rutile phase became dominant. The segregation of Cr2O3 remained modest, only detectable by surface-sensitive technique like X-ray photoelectron spectra (XPS), for the 5 and 10 at.% Cr-doped samples calcined at 600 or 700 °C, suggesting incorporation of major part of doped Cr in the lattice of TiO2. Higher calcination temperatures or higher Cr contents lead to marked segregation of Cr2O3. XPS spectra in the valence band region of the samples calcined at 600 °C revealed a shift of the binding energy (BE) at the band edge to the lower energy side with increasing Cr contents, suggesting a tendency for the electronic conduction to alter from n- to p-type. As tested preliminarily, the thick and thin film devices prepared with these samples exhibited p-type conduction, and, particularly, a thin film device using 10 at.% Cr-doped sample calcined at 600 °C proved promising performances in the detection of dilute NO2 in air at 500 °C.

Original languageEnglish
Pages (from-to)509-518
Number of pages10
JournalSensors and Actuators, B: Chemical
Volume93
Issue number1-3
DOIs
Publication statusPublished - Aug 1 2003
EventProceedings of the Ninth International Meeting on Chemical Engineering - Boston, MA, United States
Duration: Jul 7 2003Jul 10 2003

Fingerprint

Chemical sensors
Thin film devices
Photoelectrons
Calcination
Thick film devices
Monitoring
sensors
gases
X rays
Valence bands
Binding energy
roasting
Titanium dioxide
Temperature
Sol-gels
photoelectrons
conduction
X ray diffraction
x rays
thin films

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Ruiz, A. M., Sakai, G., Cornet, A., Shimanoe, K., Morante, J. R., & Yamazoe, N. (2003). Cr-doped TiO2 gas sensor for exhaust NO2 monitoring. Sensors and Actuators, B: Chemical, 93(1-3), 509-518. https://doi.org/10.1016/S0925-4005(03)00183-7

Cr-doped TiO2 gas sensor for exhaust NO2 monitoring. / Ruiz, Ana M.; Sakai, Go; Cornet, Albert; Shimanoe, Kengo; Morante, Joan Ramon; Yamazoe, Noboru.

In: Sensors and Actuators, B: Chemical, Vol. 93, No. 1-3, 01.08.2003, p. 509-518.

Research output: Contribution to journalConference article

Ruiz, AM, Sakai, G, Cornet, A, Shimanoe, K, Morante, JR & Yamazoe, N 2003, 'Cr-doped TiO2 gas sensor for exhaust NO2 monitoring', Sensors and Actuators, B: Chemical, vol. 93, no. 1-3, pp. 509-518. https://doi.org/10.1016/S0925-4005(03)00183-7
Ruiz, Ana M. ; Sakai, Go ; Cornet, Albert ; Shimanoe, Kengo ; Morante, Joan Ramon ; Yamazoe, Noboru. / Cr-doped TiO2 gas sensor for exhaust NO2 monitoring. In: Sensors and Actuators, B: Chemical. 2003 ; Vol. 93, No. 1-3. pp. 509-518.
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