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Proceedings 2017, 1(4), 488; doi:10.3390/proceedings1040488

Carbon Dots and Fluorescein: The Ideal FRET Pair for the Fabrication of a Precise and Fully Reversible Ammonia Sensor

1
Laboratory for Biomimetic Membranes and Textiles, Empa, Swiss Federal Laboratories for Materials Science and Technology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland
2
Laboratory for Building Energy Materials and Components, Empa Swiss Federal Laboratories for Material Science & Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
3
Institute for Building Materials, ETH Zürich, Stefano-Franscini-Platz 3, 8093 Zürich, Switzerland
4
Applied Wood Materials, Empa-Swiss Federal Laboratories for Material Science & Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
5
Department of Health Sciences and Technology, Institute for Biomechanics, ETH Zürich, Hoenggerbergring 64, CH-8049 Zürich, Switzerland
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
*
Author to whom correspondence should be addressed.
Published: 7 August 2017
Download PDF [334 KB, uploaded 4 September 2017]

Abstract

Monitoring of ammonia in the human breath is of paramount importance to monitor diseases link to liver and kidney mulfunctioning. The present paper describes a solid-state optical ammonia sensor based on Förster resonance energy transfer (FRET) between narrowly dispersed blue-emitting carbon nanodots (CNDs) as FRET donor and fluorescein as FRET acceptor. The fluorophores were physically entrapped in a close to superhydrophobic sol-gel matrix, in turn deposited on a PVDF-HFP electrospun fiber membrane. The sensor shows a linear calibration with a remarkably low limit of detection, i.e., 110 ppb, and adequate reproducibility up to six N2/NH3 cycles.
Keywords: carbon dots; ammonia sensor; Förster resonance energy transfer carbon dots; ammonia sensor; Förster resonance energy transfer
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

Hsu, C.-P.; Hejazi, Z.; Armagan, E.; Zhao, S.; Schmid, M.; Zhang, H.; Guo, H.; Weidenbacher, L.; Rossi, R.M.; Koebel, M.M.; Boesel, L.F.; Toncelli, C. Carbon Dots and Fluorescein: The Ideal FRET Pair for the Fabrication of a Precise and Fully Reversible Ammonia Sensor. Proceedings 2017, 1, 488.

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