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Sensitive Detection and Quantification of Nitrite Ions by Metal-organic Frameworks/Gold Nanocomposites

Mahdavi, Hossein | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54115 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdoolreza; Tamjid Shabestari, Elnaz
  7. Abstract:
  8. Nitrite (〖NO〗_2^-) anions are ubiquitous within the physiological, industrial, environmental, and food industries. The potential toxicity risk of these inorganic compounds has well been recognized; thus, the precise detection of these ions by developing reliable and high-throughput analytical methods is crucial for health and environment security. In this study, we present a reagentless electrochemical biosensor using cobalt-based metal-organic frameworks (ZIF-67) and gold nanoparticles (Au NPs) for determination of nitrite ions. The developed biosensor provides the advantages of MOF properties including high surface area, hierarchical porosity, and tunable functionalities along with high conductivity and electroactivity of Au NPs. Detailed electrochemical studies by linear sweep voltammetry (LSV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS) determine that ZIF-67 particles significantly increase the electrochemically active surface area and the current density with a mild decline of the overpotential. We also demonstrate that the detection limit is better than 0.027 µM nitrite ions. The recovery of the detection is also not lower than 91%. Our results demonstrate that the developed biosensor not only useable for fast, precise, and selective detection of the ions but also can be used for on-site analysis and quantification
  9. Keywords:
  10. Electrochemical Detection ; Gold Nanoparticle ; Biosensor ; Metal-Organic Framework ; Zeolite Imidazolate Framework ; Nitrite

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