期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 31, 页码 28546-28553出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08934
关键词
carbon dots; heavy metal ion; optical microfiber sensor; chelator; nanomaterial
资金
- NRF-ANR [M4197007.640]
- MOE [MOE2017-T2-2-002, M4020385.110]
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/(mu g/L) in the linear detection range between 0 and 300 mu g/L and a detection limit of 0.77 mu g/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.
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