Lab-in-a-Phone: Smartphone-Based Portable Fluorometer for pH Measurements of Environmental Water

By Arafat Hossain, J. Canning, Sandra Ast, P. Rutledge, T. L. Yen, Abbas Jamalipour. IEEE Sensors Journal, 2014

97 citations recorded by the source corpus.

A novel portable fluorometer combining the attributes of a smartphone with an easy-fit, simple and compact sample chamber fabricated using 3-D printing has been developed for pH measurements of environmental water in the field. A color filter attached over the camera white light light-emitting diode selects an excitation band centered around λ ~ 450 nm with a 3-dB bandwidth, Δλ ~ 21 nm. An application-specific, temperature-stable probe based on the 4-aminonaphthalimide fluorophore was synthesized to absorb at this wavelength while emitting in the green region of the visible spectrum. The green emission is readily detected using the smartphone camera and a simple red-green-blue Android application. Suppression of the green emission increases with increasing pH enabling a straightforward pH sensor. The system was calibrated against a commercial spectrofluorometer and pH measurements were taken at various locations around Sydney. The results were then compared directly with those obtained using conventional electrode-based measurements. The data can be stored in the phone's available memory or transmitted by phone back to base for further real-time analysis.

Subfields: Biomedical Engineering, Infectious Diseases, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/b3f0180bb478f51cbd5039cd824cbf9fdb6de91b

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Citations in the corpus

• A review of 3D-printed sensors (2017, methodology): “Hence, the camera of a smartphone can act as the optical detector for simple experimental operation and timely colorimetric analysis (61, 62).”