Direct determination of graphene quantum dots based on terbium-sensitized luminescence
| Autor: | Eulogio J. Llorent-Martínez, L. Molina-García, Ángel Ríos, Antonio Ruiz-Medina, Gema M. Durán |
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| Rok vydání: | 2018 |
| Předmět: |
Detection limit
Chemistry Graphene 010401 analytical chemistry chemistry.chemical_element Terbium 02 engineering and technology 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Analytical Chemistry Nanomaterials law.invention Ion Wavelength Quantum dot law 0210 nano-technology Luminescence Instrumentation Spectroscopy |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 198:177-181 |
| ISSN: | 1386-1425 |
| Popis: | Graphene quantum dots (GQD) were determined in water samples using terbium-sensitized luminescence (TSL). Terbium ions complex with GQD due to the carboxylic groups that are usually present in these nanomaterials, increasing the luminescence signal of terbium. In Tb(III)-GQD complexes, GQD absorb energy at their characteristic excitation wavelength and transfer it to terbium ion, which emits at its particular emission wavelength. The analytical signal, measured at λexc=257nm and λem=545nm, increases proportionally to GQD concentration between 50 and 500μgL-1. Under optimum conditions, the proposed method presents a detection limit of 15μgL-1 and is selective to GQD in the presence of other nanomaterials of similar size. As GQD are highly water-soluble, they are potential contaminants in environmental or drinking waters water samples, and hence the method was applied to the analysis of different drinking waters which were the target samples for the application of the developed method. |
| Databáze: | OpenAIRE |
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