Fabrication of Cysteamine capped-CdSe QDs anchored graphene xerogel nanosensor for facile onsite visual detection of TNT
| Autor: | Vishal Kumar, Soumitra Satapathi, Anshu Kumar, Prathul Nath |
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| Rok vydání: | 2021 |
| Předmět: |
Detection limit
Materials science Graphene Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Fluorescence Atomic and Molecular Physics and Optics Meisenheimer complex 0104 chemical sciences law.invention Nanosensor Quantum dot law Explosive detection General Materials Science Physical and Theoretical Chemistry Time-resolved spectroscopy 0210 nano-technology |
| Zdroj: | Nano-Structures & Nano-Objects. 25:100643 |
| ISSN: | 2352-507X |
| Popis: | Owing to the importance of explosive detection for the security of land and the environment, the exploration of new methodologies for sensing electron-deficient nitroaromatics explosives (NAEs) is urgently imperative. In this work, we firstly reported a colorimetric sensor for visual detection of 2,4,6-trinitrotoluene (TNT) based on Cysteamine capped-CdSe quantum dots (QDs) decorated graphene-chitosan xerogel (GSXS), which is shown to have high signal-to-background ratio. Meisenheimer complex formation, which is a well-known sensing mechanism, is characterized by steady state and time resolved spectroscopy supported by Density-Functional-Theory (DFT). Upon Green Fluorescent Protein (GFP) illumination, this stable Meisenheimer complex actively suppresses the attributed fluorescence of QD-GSXS and thus providing a novel path for chemical sensing applications. Under optimized conditions, the sensor displayed a wide linear range from 0.0 to 311.4 μ M with a limit of detection 9.7 μ M. The developed chemosensor showed several advantages, including good selectivity and excellent stability. The proposed approach can be utilized for the rapid and sensitive detection of NAEs in the solution phase and also for clinical application. |
| Databáze: | OpenAIRE |
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