Nanoparticle-based ‘turn-on’ scattering and post-sample fluorescence for ultrasensitive detection of water pollution in wider window

Autoři: Soumendra Singh aff001;  Animesh Halder aff003;  Oindrila Sinha aff005;  Probir Kumar Sarkar aff006;  Priya Singh aff001;  Amrita Banerjee aff003;  Saleh A. Ahmed aff007;  Ahmed Alharbi aff007;  Rami J. Obaid aff007;  Sanjay K. Ghosh aff002;  Amitabha Mitra aff002;  Samir Kumar Pal aff001
Působiště autorů: Department of Chemical, Biological and Macromolecular Sciences, S.N Bose National Centre for Basic Sciences, Kolkata, West Bengal, India aff001;  Centre for Astroparticle Physics and Space Science, Bose Institute, West Bengal, Kolkata, India aff002;  Technical Research Centre, S. N. Bose National Centre for Basic Sciences, Kolkata, West Bengal, India aff003;  Department of Applied Optics & Photonics, University of Calcutta, Kolkata, West Bengal, India aff004;  Department of Life Sciences, Presidency University, Kolkata, West Bengal, India aff005;  Department of Physics, Ananda Mohan College, Kolkata, West Bengal, India aff006;  Department of Chemistry, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia aff007
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0227584


Ultrasensitive detection of heavy metal ions in available water around us is a great challenge for scientists since long time. We developed an optical technique that combines Rayleigh scattering of UV light (365 nm) and post-sample fluorescence detection from colloidal silver (Ag) nanoparticles (NPs) having a surface plasmon resonance (SPR) band at 420 nm. The efficacy of the technique is tested by the detection of several model toxic ions, including mercury, lead, and methylmercury in aqueous media. The light scattering from the Hg-included/inflated Ag NPs at 395 nm was observed to saturate the light sensor even with ppm-order concentrations of Hg ions in the water sample. However, the pollutant is not detected at lower concentrations at this wavelength. Instead, the fluorescence of a high-pass filter (cut-off at 400 nm) at 520 nm is applied to detect pollutant concentrations of up to several hundreds of ppm in the water sample. We also detected lead and methylmercury as model pollutants in aqueous media and validated the efficacy of our strategy. Finally, we report the development of a working prototype based on the strategy developed for efficient detection of pollutants in drinking/agricultural water.

Klíčová slova:

Artificial light – Fluorescence – Heavy metals – Metallic lead – Metallic mercury – Pollutants – Water pollution – Aqueous solutions


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2020 Číslo 1