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Sensors 2015, 15(1), 760-768; doi:10.3390/s150100760

Creating Diversified Response Profiles from a Single Quenchometric Sensor Element by Using Phase-Resolved Luminescence

1
Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
2
Department of Electrical and Computer Engineering, McGill University, McConnell Engineering Building, 3480 University Street, Montreal, QC H3A 0E9, Canada
3
Department of Electrical Engineering, Bonner Hall, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
*
Authors to whom correspondence should be addressed.
Received: 16 November 2014 / Accepted: 12 December 2014 / Published: 5 January 2015
(This article belongs to the Section Chemical Sensors)
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Abstract

We report a new strategy for generating a continuum of response profiles from a single luminescence-based sensor element by using phase-resolved detection. This strategy yields reliable responses that depend in a predictable manner on changes in the luminescent reporter lifetime in the presence of the target analyte, the excitation modulation frequency, and the detector (lock-in amplifier) phase angle. In the traditional steady-state mode, the sensor that we evaluate exhibits a linear, positive going response to changes in the target analyte concentration. Under phase-resolved conditions the analyte-dependent response profiles: (i) can become highly non-linear; (ii) yield negative going responses; (iii) can be biphasic; and (iv) can exhibit super sensitivity (e.g., sensitivities up to 300 fold greater in comparison to steady-state conditions). View Full-Text
Keywords: phase-resolved luminescence detection; quenchometric sensor; gaseous oxygen (O2) sensing phase-resolved luminescence detection; quenchometric sensor; gaseous oxygen (O2) sensing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Tehan, E.C.; Bukowski, R.M.; Chodavarapu, V.P.; Titus, A.H.; Cartwright, A.N.; Bright, F.V. Creating Diversified Response Profiles from a Single Quenchometric Sensor Element by Using Phase-Resolved Luminescence. Sensors 2015, 15, 760-768.

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