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Surface plasmon resonance optical sensor for mercury ion detection by crosslinked chitosan thin film

YAP WING FEN1,* , W. MAHMOOD MAT YUNUS1, MOHD MAAROF MOKSIN1, ZAINAL ABIDIN TALIB1, NOR AZAH YUSOF2

Affiliation

  1. Department of Physics, Faculty of Science, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
  2. Department of Chemistry, Faculty of Science, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

Abstract

Mercury ion can be detected by measuring surface plasmon resonance signal with a thin crosslinked chitosan layer deposited on a gold film. The crosslinked chitosan is synthesized by homogeneous reaction of medium molecular weight chitosan in aqueous acetic acid solution with glutaraldehyde as crosslinking agent. By surface plasmon resonance sensor, the optical properties of crosslinked chitosan thin film before and after contacting with different concentration of mercury ion range 0.5 to 100 ppm have been obtained by fitting. The resonance angle shifted higher values to the left as the copper ion concentration increased. By introducing the crosslinked chitosan film, mercury ion detection can be obtained for concentration as low as 500 ppb using surface plasmon resonance technique..

Keywords

Surface plasmon resonance, Mercury ion, Crosslinked chitosan.

Submitted at: Dec. 20, 2010
Accepted at: March 16, 2011

Citation

YAP WING FEN, W. MAHMOOD MAT YUNUS, MOHD MAAROF MOKSIN, ZAINAL ABIDIN TALIB, NOR AZAH YUSOF, Surface plasmon resonance optical sensor for mercury ion detection by crosslinked chitosan thin film, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 3, pp. 279-285 (2011)