Stable sensors with tunable sensitivities based on class II xerogels

Analytical Chemistry
Zunyu TaoFrank V Bright

Abstract

We report on the analytical figures of merit for O2-responsive sensor arrays and films formed by sequestering tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) within class II organically modified silicates that are composed of tetramethoxysilane or tetraethoxysilane and monoalkylsiloxanes of the form (CnH(2n+1))-Si-(OR)3 (n = 1-12, R = Me or Et). These sensors exhibit a reasonably linear response to gaseous and dissolved O2 (r2 > 0.99), and the sensor responses are stable for over 2 years. Sensor sensitivity can be tuned continuously by adjusting n. For gas-phase O2 detection, changes in the sensor sensitivity depend primarily on the O2 diffusion coefficient within the xerogel phase. The O2 solubility coefficient within the xerogel phase is also a factor but to a lesser degree. For dissolved O2 detection, changes in the sensor sensitivity depend on the O2 diffusion coefficient and the O2 solubility coefficient within the xerogel phase. A linear correlation also exists between the sensor sensitivity and the polarity within these xerogels. Finally, the feature size of pin-printed sensor elements was found to depend linearly on pin velocity. The results of these experiments demonstrate a new strategy for creating xerogel-based ...Continue Reading

References

Dec 22, 1999·Analytical Chemistry·J N DemasP B Coleman
Aug 21, 2003·Analytical Biochemistry·Mark K McQuainFrederick R Haselton
Apr 15, 2005·Analytical Chemistry·Rachel M BukowskiFrank V Bright
Jan 1, 1998·Analytical Chemistry·C McDonaghA K McEvoy

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Citations

Oct 1, 2009·IEEE Transactions on Biomedical Circuits and Systems· Lei YaoF V Bright
Sep 28, 2006·Applied Spectroscopy·Rachel M BukowskiFrank V Bright
Jul 10, 2010·Applied Spectroscopy·Ellen L Holthoff, Frank V Bright
Mar 19, 2014·Chemical Society Reviews·Xu-dong Wang, Otto S Wolfbeis
Jan 30, 2008·The Analyst·Clare HigginsColette McDonagh
Jun 30, 2007·Accounts of Chemical Research·Ellen L Holthoff, Frank V Bright
Jan 31, 2008·Chemical Reviews·Colette McDonaghBrian D MacCraith

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