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Proceedings Paper

Fluorescent measurements of Zn2+ on a smartphone
Author(s): Md. Arafat Hossain; Sandra Ast; John Canning; Kevin Cook; Peter J. Rutledge; Abbas Jamalipour
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Paper Abstract

Using a smartphone-based portable spectrofluorimeter, measurement of metal ion concentration in water is reported. A UV LED (λex ~ 370 nm), which is powered by the internal source of the smartphone was implemented to function as the excitation source. The emission peak of the UV LED overlaps well with the absorption peak of the Zn2+-responsive molecular probe 6-(1,4,8,11-cyclam-1-yl)ethyl-1,2,3-triazol-4-yl)2-ethyl-naphthalimide fluoro-ionophore (λabs ~ 358 nm). The fluorescence emission of this dye at λem ~ 458 nm is enhanced upon coordination of Zn2+. A customized Android application digitally processes the image from a nano-imprinted polymer diffraction grating and analyses the spectral changes. Zn2+ concentration in water samples were measured with a detection limit of δ ~ 5 μM.

Paper Details

Date Published: 1 July 2015
PDF: 4 pages
Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 965511 (1 July 2015); doi: 10.1117/12.2184246
Show Author Affiliations
Md. Arafat Hossain, The Univ. of Sydney (Australia)
Sandra Ast, The Univ. of Sydney (Australia)
John Canning, The Univ. of Sydney (Australia)
Kevin Cook, The Univ. of Sydney (Australia)
Peter J. Rutledge, The Univ. of Sydney (Australia)
Abbas Jamalipour, The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 9655:
Fifth Asia-Pacific Optical Sensors Conference
Byoungho Lee; Sang-Bae Lee; Yunjiang Rao, Editor(s)

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