A smart-phone based ratiometric nanoprobe for label-free detection of methyl parathion

Fahimi Kashani, N ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.snb.2020.128580
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. The widespread use of pesticides in pest management has boosted the demands for developing highly sensitive probes for on-site monitoring. Herein we presented a sensitive enzyme-free ratiometric probe for determination of methyl parathion (MP), as an organophosphate pesticide using TGA-capped CdTe QDs and carbon dots (CDs). Unlike previous methods in which hydrolysis product of MP is instrumental in the response of the sensors, here, self-assembly of cetyltrimethylammonium bromide (CTAB) on the surface of non-modified yellow-emissive CdTe QDs facilitates the quenching of CTAB-QDs upon addition of MP while the fluorescence intensity of CDs remains constant. Using a smartphone, the ratiometric probe shows visual emission color changes from orange-peach into pink, purple, weak blue, and dark blue, which is highly appropriate for quantitative detection of MP based on the hue-saturation-lightness color model. A wide linear range from 0.001 μg.mL−1 to 10 μg. mL−1 MP with a low limit of detection of 1.2 ng. mL−1 (S/N = 3) were obtained under optimized condition. Furthermore, with high sensitivity and selectivity, this platform has the capability to detect MP in rice and tap water samples with desired results. © 2020 Elsevier B.V
  6. Keywords:
  7. Label-free ; Methyl parathion ; Organophosphate pesticides ; Ratiometric nanoprobe ; Smartphone ; Visual detection ; Cadmium telluride ; II-VI semiconductors ; Pesticides ; Probes ; Cetyltrimethylammonium bromide ; Fluorescence intensities ; Hydrolysis products ; Label-free detection ; On-site monitoring ; Optimized conditions ; Organophosphate pesticides ; Quantitative detection ; Smartphones
  8. Source: Sensors and Actuators, B: Chemical ; Volume 322 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925400520309266