High Oxygen Sensitivity of Nanocrystalline Ceria Prepared by Thermochemical Process

Abstract:

Article Preview

Nanostructured CeO2 powder was synthesized by a thermochemical process and its applicability as an oxygen gas sensor was investigated. An amorphous precursor was prepared by spray drying a cerium-nitrate solution and then heat-treated in air to induce evaporation of volatile components from the precursor powder, which then forms nanostructured ceria. The powder produced possessed a loose agglomerated structure with extremely fine CeO2 particles about 15 nm in size, resulting in a very high specific surface area (110 m2/g). The average grain size of a specimen sintered from the ceria powder at 1000 oC was about 40 nm, and its oxygen sensitivity n (logσ  log(PO2 /Po)-n) was about 1/4 at 600 oC. The response time t90, time for responding to a change of oxygen partial pressure, of the specimens sintered at 800 ~ 1100 oC was very short, i.e., 3 ~ 5 seconds: The signal output was almost identical and uniformly repeated in a stable manner.

Info:

Periodical:

Materials Science Forum (Volumes 534-536)

Edited by:

Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim

Pages:

61-64

Citation:

D.W. Lee et al., "High Oxygen Sensitivity of Nanocrystalline Ceria Prepared by Thermochemical Process", Materials Science Forum, Vols. 534-536, pp. 61-64, 2007

Online since:

January 2007

Export:

Price:

$38.00

[1] M. Ogita, K. Higo, Y. Nakanishi, and Y. Hatanaka: Appl. Surf. Sci. Vol. 175 (2001), p.721.

[2] D. Pribat and G. Velasco: Sens. Actuators Vol. B13 (1998), p.173.

[3] N. Izu, W.S. Shin, and N. Murayama: Sens. Actuators Vol. B94 (2003), p.222.

[4] N. Izu, W.S. Shin, and N. Murayama: Sens. Actuators Vol. B100 (2004), p.411.

[5] U. Lamp, J. Gerblinger, and H. Meixner: Sens. Actuators Vol. B7 (1992), p.787.

[6] J. Gerblinger, W. Lohwasser, U. Lampe, and H. Meixner: Sens. Actuators Vol. B26-27 (1995), p.93.

[7] D.W. Lee and B.K. Kim: Mater. Lett. Vol. 58 (2004), p.378.

[8] D.W. Lee, J.W. Lee, T.S. Jang, and B.K. Kim: J. Ceramic Proc. Res. (2006), in press.

[9] M.A. Panhans and R.N. Blumenthal: Solid State Ionics Vol. 60 (1993), p.279.

[10] Y.M. Chiang, E.B. Lavik, I. Kosaaki, H.L. Tuller, and J.Y. Ying: J. Electroceram. Vol. 1 (1997), p.7.

[11] T. Suzuki, I. Kosacki, H.U. Anderson, and P. Colomban: J. Am. Ceram. Soc. Vol. 84 (2001), p. (2007).

[12] N. Izu, W.S. Shin, N. Murayama, and S. Kanzaki: Sens. Actuators Vol. B87 (2002), p.95.

[13] N. Izu, W.S. Shin, and N. Murayama: Sens. Actuators Vol. B87 (2002), p.99. Fig. 4. (a) The response time t90 and (b) the signal reliability of the specimens sintered from the nanostructured ceria powder. (a) (b).

Fetching data from Crossref.
This may take some time to load.