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Title: Carbon dot-functionalized interferometric optical fiber sensor for detection of ferric ions in biological samples
Authors: Yap, Stephanie Hui Kit
Chan, Kok Ken
Zhang, Gong
Tjin, Swee Chuan
Yong, Ken-Tye
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Yap, S. H. K., Chan, K. K., Zhang, G., Tjin, S. C., & Yong, K.-T. (2019). Carbon dot-functionalized interferometric optical fiber sensor for detection of ferric ions in biological samples. ACS Applied Materials & Interfaces, 11(31), 28546-28553. doi:10.1021/acsami.9b08934
Journal: ACS Applied Materials & Interfaces
Abstract: This work reports an interferometric optical microfiber sensor functionalized with nitrogen- and sulfur-codoped carbon dots (CDs) for the detection of ferric ions (Fe3+). Compared to other CD-based ferric ion sensors, the sensing mechanism of this presented sensor is dependent on the refractive index modulations due to selective Fe3+ adsorption onto the CD binding sites at the tapered region. This is the first study in which CD-based sensing was performed at the solid phase as a chelator, which does not rely on its fluorescence properties. The detection performance of the proposed sensor is not only comparable to a conventional fluorescence-based CD nanoprobe sensor but also capable of delivering quantitative analysis results and ease of translation to a sensor device for on-site detection. The presented sensor exhibits Fe3+ detection sensitivity of 0.0061 nm/(μg/L) in the linear detection range between 0 and 300 μg/L and a detection limit of 0.77 μg/L based on the Langmuir isotherm model. Finally, the potential use of the CD-functionalized optical microfiber sensor in the real environmental and biological Fe3+ monitoring applications has also been validated in this work.
ISSN: 1944-8252
DOI: 10.1021/acsami.9b08934
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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