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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 25 — Sep. 1, 2011
  • pp: E145–E151

Optical oxygen sensing properties of Ru(II) complex and porous silica nanoparticles embedded in solgel matrix

Cheng-Shane Chu  »View Author Affiliations

Applied Optics, Vol. 50, Issue 25, pp. E145-E151 (2011)

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This paper presents a high-sensitivity oxygen sensor that comprises an optical fiber coated at one end with tris(4,7-diphenyl-1,10-phenanthroline) ruthenium(II) ( [ Ru ( dpp ) 3 ] 2 + ) and porous silica nanoparticles embedded in an n-octyltriethoxysilane (Octyl-triEOS)/tetraethylorthosilane (TEOS) composite xerogel. The sensitivity of the optical oxygen sensor is quantified in terms of the ratio I N 2 / I O 2 , where I N 2 and I O 2 represent the detected fluorescence intensities in pure nitrogen and pure oxygen environments, respectively. The experimental results show that the oxygen sensor has a sensitivity of 26. The response time was 2 s when switching from pure nitrogen to pure oxygen, and 7.7 s when switching in the reverse direction. The experimental results show that compared to an oxygen sensor based on Ru(II) complex immobilized in the solgel matrix, the proposed optical fiber oxygen sensor has higher sensitivity. In addition to the increased surface area per unit mass of the sensing surface, the porous silica nano particles increase the sensitivity because a substantial number of aerial oxygen molecules penetrate the porous silica shell. The proposed optical sensor has the advantages of easy fabrication, low cost, fast response, and high sensitivity for oxygen monitoring using a cheap LED as a light source.

© 2011 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(160.6030) Materials : Silica
(160.6060) Materials : Solgel
(350.4990) Other areas of optics : Particles

Original Manuscript: March 21, 2011
Revised Manuscript: July 2, 2011
Manuscript Accepted: July 21, 2011
Published: August 11, 2011

Virtual Issues
Vol. 6, Iss. 10 Virtual Journal for Biomedical Optics

Cheng-Shane Chu, "Optical oxygen sensing properties of Ru(II) complex and porous silica nanoparticles embedded in solgel matrix," Appl. Opt. 50, E145-E151 (2011)

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