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Effect of organic modification on oxygen sensing properties of xerogel with a covalently linked ruthenium(II) complex

YANHONG LIU1,2, BIN LI1,* , XIUDONG WU3, YAN CONG1,2

Affiliation

  1. Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
  2. Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100039, P. R. China
  3. Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China

Abstract

A series of organic-inorganic hybrid composites were prepared from methyltriethoxylsilane (MTEOS) /tetraethylorthosilane (TEOS) xerogels chemically doped with a Ru(II) complex. The effect of MTEOS/TEOS molar ratio on the luminescence and oxygen sensing properties has been systematically investigated based on the luminescence intensity quenching. Moreover, the effects of MTEOS/TEOS molar ratio on the structure change in the matrix and the bonding between the probes and the matrix were studied by Fourier transform infrared spectroscopy (FTIR) and electronic absorption spectra etc in detail for a better understanding of the oxygen sensing behaviors. The experimental results show blue shift in the emission wavelength of Ru(II) complex entrapped within MTEOS/TEOS compared with that in the pure silica matrix. And the oxygen sensitivity was found to increase with increasing molar ratio of MTEOS to TEOS owing to the decreased polarity of the microenvironment around the Ru(II) molecules. Leaching study was also performed for testing the bonding between the probes and the xerogel matrix, which shows that parts of the indicator dyes would elute from the matrix for the xerogel containing more than 20% MTEOS because of less Si-OH groups with which the dyes could react to form covalent bond..

Keywords

Oxygen sensing, Ormosils, Covalent bond, Ru(II) complex.

Submitted at: April 29, 2009
Accepted at: June 28, 2009

Citation

YANHONG LIU, BIN LI, XIUDONG WU, YAN CONG, Effect of organic modification on oxygen sensing properties of xerogel with a covalently linked ruthenium(II) complex, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 6, pp. 880-886 (2009)