Photonic nanosensor for colorimetric detection of metal ions

Yetisen, Ali K., Montelongo, Yunuen, Qasim, Malik M., Butt, Haider, Wilkinson, Timothy D., Monteiro, Michael J. and Yun, Seok Hyun (2015) Photonic nanosensor for colorimetric detection of metal ions. Analytical Chemistry, 87 10: 5101-5108. doi:10.1021/ac504274q

Author Yetisen, Ali K.
Montelongo, Yunuen
Qasim, Malik M.
Butt, Haider
Wilkinson, Timothy D.
Monteiro, Michael J.
Yun, Seok Hyun
Title Photonic nanosensor for colorimetric detection of metal ions
Journal name Analytical Chemistry   Check publisher's open access policy
ISSN 1520-6882
Publication date 2015-02-24
Sub-type Article (original research)
DOI 10.1021/ac504274q
Open Access Status Not yet assessed
Volume 87
Issue 10
Start page 5101
End page 5108
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2016
Language eng
Formatted abstract
The real-time sensing of metal ions at point of care requires integrated sensors with low energy and sample consumption, reversibility, and rapid recovery. Here, we report a photonic nanosensor that reversibly and quantitatively reports on variation in the concentrations of Pb2+ and Cu2+ ions in aqueous solutions (<500 μL) in the visible region of the spectrum (λmax ≈ 400–700 nm). A single 6 ns laser pulse (λ = 532 nm) was used to pattern an ∼10 μm thick photosensitive recording medium. This formed periodic AgBr nanocrystal (ø ∼ 5–20 nm) concentrated regions, which produced Bragg diffraction upon illumination with a white light source. The sensor functionalized with 8-hydroxyquinoline allowed sensing through inducing Donnan osmotic pressure and tuning its lattice spacing. The sensor quantitatively measured Pb2+ and Cu2+ ion concentrations within the dynamic range of 0.1–10.0 mM with limits of detection of 11.4 and 18.6 μM in under 10 min. The sensor could be reset in 3 min and was reused at least 100 times without compromising its accuracy. The plasmonic nanosensor represents a simple and label-free analytical platform with potential scalability for applications in medical diagnostics and environmental monitoring.
Keyword Point of care
Integrated sensors
Photonic nanosensor
Aqueous solutions
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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