Enhanced oxygen sensing properties of Pt(II) complex and dye entrapped core-shell silica nanoparticles embedded in sol-gel matrix

Chen Shane Chu, Yu Lung Lo, Ti Wen Sung

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

This paper presents a highly sensitive oxygen sensor that comprises an optical fiber coated at one end with platinum(II) meso- tetrakis(pentafluorophenyl)porphyrin (PtTFPP) and PtTFPP entrapped core-shell 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 I0/I100, where I0 and I100 represent the detected fluorescence intensities in pure nitrogen and pure oxygen environments, respectively. The experimental results show that the oxygen sensor has a sensitivity (I 0/I100) of 166. The response time was 1.3 s when switching from pure nitrogen to pure oxygen, and 18.6 s when switching in the reverse direction. The experimental results show that compared to oxygen sensors based on PtTFPP, PtOEP, or Ru(dpp)3 2+ dyes, the proposed optical fiber oxygen sensor has the highest sensitivity. In addition to the increased surface area per unit mass of the sensing surface, the dye entrapped in the core of silica nanoparticles also increases the sensitivity because a substantial number of aerial oxygen molecules penetrate the porous silica shell. The dye entrapped core-shell nanoparticles is more prone to oxygen quenching.

Original languageEnglish
Pages (from-to)1044-1051
Number of pages8
JournalTalanta
Volume82
Issue number3
DOIs
Publication statusPublished - 2010 Aug 15

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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