Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-29T19:05:33.519Z Has data issue: false hasContentIssue false
  • English
  • Français

Dependence of gas sensing properties in ZnO nanofibers on size and crystallinity of nanograins

Published online by Cambridge University Press:  18 July 2011

Sun-Woo Choi ,
Jae Young Park  and
Sang Sub Kim
Sun-Woo Choi
Affiliation:
School of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea
Jae Young Park
Affiliation:
School of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea
Sang Sub Kim*
Affiliation:
School of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

We demonstrate that the size and crystallinity of grains in individual ZnO nanofibers greatly influence their sensing properties for CO. The sensing properties, including sensitivity, response and recovery times of a sensor fabricated with ZnO nanofibers composed of large grains are much superior to those of a sensor fabricated with nanofibers of small grains. The crystallinity, improved by the longer calcination time, is likely to be responsible for the higher sensitivity in the large-grained nanofibers. The facilitated occupancy and desorption of CO molecules at grain boundaries in the large-grained nanofibers are the most probable causes of the shorter response and recovery times in detecting CO, respectively. This work suggests not only that electrospinning-synthesized ZnO nanofibers hold promise for realizing sensitive and reliable gas sensors but also that the size as well as the crystallinity of the grains existing in individual nanofibers need to be optimized to obtain the best sensing properties.

Keywords

NanostructureSensorGrain size
Type
Materials Communications
Information
Journal of Materials Research , Volume 26 , Issue 14 , 28 July 2011 , pp. 1662 - 1665
Copyright
Copyright © Materials Research Society 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Yury, G.: Nanotubes and Nanofibers (Taylor & Francis Group, LLC, New York, 2006).Google Scholar
2.Lu, J.G., Chang, P., and Fan, Z.: Quasi-one-dimensional metal oxide materials-synthesis, properties and applications. Mater. Sci. Eng., R 52, 49 (2006).Google Scholar
3.Huang, X-J. and Choi, Y-K.: Chemical sensors based on nanostructured materials. Sens. Actuators, B 122, 659 (2007).CrossRefGoogle Scholar
4.Rodríguez, J.A. and Marcos, F-G.: Synthesis, Properties, and Applications of Oxide Nanomaterials (John Wiley & Sons, Inc., Hoboken, NJ, 2007).CrossRefGoogle Scholar
5.Kuchibhatla, S.V.T., Karakoti, A.S., Bera, D., and Seal, S.: One-dimensional nanostructured materials. Prog. Mater. Sci. 52, 699 (2007).Google Scholar
6.Sawicka, K.M. and Gouma, P.: Electrospun composite nanofibers for functional applications. J. Nanopart. Res. 8, 769 (2006).Google Scholar
7.Asokan, K., Park, J.Y., Choi, S-W., Chang, C., and Kim, S.S.: Stabilization of the anatase phase of Ti1-xSnxO2 (x<0.5) nanofibers. Nano Res. 3, 256 (2010).CrossRefGoogle Scholar
8.Park, J.Y., Choi, S-W., Asokan, K., and Kim, S.S.: Growth of nanograins in TiO2 nanofibers synthesized by electrospinning. J. Nanosci. Nanotechnol. 10, 3604 (2010).Google Scholar
9.Ramakrishna, S., Fujihara, K., Teo, W.E., Lim, T.C., and Ma, Z.: An Introduction to Electrospinning and Nanofibers (World Scientific Pub. Co. Inc., Singapore, 2005).CrossRefGoogle Scholar
10.Park, J.Y. and Kim, S.S.: Growth of nanograins in electrospun ZnO nanofibers. J. Am. Ceram. Soc. 92, 1691 (2009).Google Scholar
11.Park, J.Y., Choi, S-W., Lee, J.W., Lee, C.M., and Kim, S.S.: Synthesis and gas sensing properties of TiO2-ZnO core-shell nanofibers. J. Am. Ceram. Soc. 92, 2551 (2009).Google Scholar
12.Choi, S-W., Park, J.Y., and Kim, S.S.: Synthesis of SnO2-ZnO core-shell nanofibers via a novel two-step process and their gas sensing properties. Nanotechnology 20, 465603 (2009).Google Scholar
13.Aswal, D.K. and Gupta, S.K.: Science and Technology of Chemiresistor Gas Sensors (Nova Science Publishers, Inc., New York, 2007).Google Scholar
14.Seeley, Z.M., Bandyopadhyay, A., and Bose, S.: Influence of crystallinity on CO gas sensing for TiO2 films. Mater. Sci. Eng., B 164, 38 (2009).CrossRefGoogle Scholar
15.Ahn, J-P., Kim, J-H., Park, J-K., and Huh, M-Y.: Microstructure and gas sensing properties of thick film sensor using nanophase SnO2 powder. Sens. Actuators, B 99, 18 (2004).Google Scholar