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Researchers from Tarbiat Modarres University used a doped polypyrrole nanostructured film as an optical nanosensor sensitive to ammonia gas.
High selectivity of ammonia through a simple and cost-effective method with appropriate response time is among the advantages of this nanosensor, which enables its application in commercial and medical kits in order to measure the amount of ammonia in various samples.
In this research, the polypyrrole film doped with a dye is coated on polystyrene through chemical polymerization. Various parameters that affect the homogeneity, stability, and the change in the optical behavior of the film coated on the bed were optimized, and the changes in optical properties of the synthesized film were studied in the presence of ammonia in order to design the optical sensor.
The dye used in the nanosensor is a dopant and it contains acidic groups that can react with ammonia, which has alkaline properties, and it can change the color of the thin film in the dye adsorption wavelength.
Results of the research show that the produced sensor has acceptable selectivity and sensitivity to ammonia in comparison to the vapor of other amines such as methylamine and also to methanol, ethanol, acetonitrile, acetone, hexane, pyridine, and water.
Taking into consideration its low determination range and high response rate, this sensor can be used in medical industries in order to diagnose diseases. It can also be used in portable measurements due to its volume and its simple design.
Results of the research have been published in detail in Sensors and Actuators B: Chemical, vol. 176, pp. 761-767.
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