Gold nanoparticles for sensing Mn2+ in water

Krishna Sarma, Devabrata Sarmah, Sunandan Baruah


Abstract: Gold nanoparticles coated with polymers like chitosan, polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP) and poly acrylic acid (PAA) can effectively be used to detect the presence of Mn2+ ions in water. A shift in the optical absorbance peak of the Au colloid is observed in the presence of Mn2+ ions. The shift in the absorbance peak wavelength is directly proportional to the concentration of Mn2+ ions in water. Chitosan capping was found to give the maximum shift and as such was selected for the development of a sensor for detecting Mn2+ ions in water. The variation in photo-energy of the photons after passing through the colloidal dispersion of chitosan coated Au nanoparticles varies the conductivity of the detector and this can be related to the concentration of the Mn2+ ions in water. Two different detectors were tested, a nanosensor and a light dependent resistor, with the latter demonstrating better response.


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