Iranian Researchers Develop Nanosensors Detecting Heavy Metals in Drinking Water

Tuesday, December 10, 2019 - 16:31

Researchers from University of Tehran have developed a kind of nanosensor which its sensitivity for mercury detection can be improved by using learning-based smart phone colorimetry.

According to an ISCA report, in this study, University of Tehran researchers, Samira Sajed, Fatemeh Arefi, Mohammadreza Kolahdouz and Mohammad Amin Sadeghi, could design a gadget and print by using a lightweight 3D material, which can be attached to any smart phone and integrated with optical components.

Based on the study, “a full color TFT LCD display was used as the uniform source of any color of light. Aptamer conjugated gold nanoparticles were employed to determine the concentration of Hg2+ as the basis of a colorimetric sensor.

“Interaction between the aptamer and the analytes leads to a color change in the solution due to aggregation of gold nanoparticles. For the corresponding color change detection, a novel image processing protocol using RGB value was introduced for each captured image.

“Multiple linear regression analysis was also exploited to achieve a better sensor response model. Light source enhancement, colorimetry at more points of visible spectrum (470, 540, 640 nm) and a powerful post process technique including machine learning made it possible to obtain an excellent level of sensitivity (1 nM–0.2 ppb).”

The research results have been published in Sensors and Actuators B: Chemical journal.


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