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Investigating the effect of N-doping on carbon quantum dots structure, optical properties and metal ion screening.
Nguyen, Kiem Giap; Baragau, Ioan-Alexandru; Gromicova, Radka; Nicolaev, Adela; Thomson, Stuart A J; Rennie, Alistair; Power, Nicholas P; Sajjad, Muhammad Tariq; Kellici, Suela.
Afiliación
  • Nguyen KG; London Centre for Energy Engineering (LCEE), School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK.
  • Baragau IA; London Centre for Energy Engineering (LCEE), School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK.
  • Gromicova R; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Ilfov, Romania.
  • Nicolaev A; School of Life Health and Chemical Sciences, Open University, Walton Hall, Milton Keynes, UK.
  • Thomson SAJ; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Ilfov, Romania.
  • Rennie A; Edinburgh Instruments Ltd., 2 Bain Square, Livingston, EH54 7DQ, UK.
  • Power NP; Edinburgh Instruments Ltd., 2 Bain Square, Livingston, EH54 7DQ, UK.
  • Sajjad MT; School of Life Health and Chemical Sciences, Open University, Walton Hall, Milton Keynes, UK.
  • Kellici S; London Centre for Energy Engineering (LCEE), School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK. sajjadt@lsbu.ac.uk.
Sci Rep ; 12(1): 13806, 2022 08 15.
Article en En | MEDLINE | ID: mdl-35970901
Carbon quantum dots (CQDs) derived from biomass, a suggested green approach for nanomaterial synthesis, often possess poor optical properties and have low photoluminescence quantum yield (PLQY). This study employed an environmentally friendly, cost-effective, continuous hydrothermal flow synthesis (CHFS) process to synthesise efficient nitrogen-doped carbon quantum dots (N-CQDs) from biomass precursors (glucose in the presence of ammonia). The concentrations of ammonia, as nitrogen dopant precursor, were varied to optimise the optical properties of CQDs. Optimised N-CQDs showed significant enhancement in fluorescence emission properties with a PLQY of 9.6% compared to pure glucose derived-CQDs (g-CQDs) without nitrogen doping which have PLQY of less than 1%. With stability over a pH range of pH 2 to pH 11, the N-CQDs showed excellent sensitivity as a nano-sensor for the highly toxic highly-pollutant chromium (VI), where efficient photoluminescence (PL) quenching was observed. The optimised nitrogen-doping process demonstrated effective and efficient tuning of the overall electronic structure of the N-CQDs resulting in enhanced optical properties and performance as a nano-sensor.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Puntos Cuánticos Tipo de estudio: Diagnostic_studies / Screening_studies Idioma: En Revista: Sci Rep Año: 2022 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Puntos Cuánticos Tipo de estudio: Diagnostic_studies / Screening_studies Idioma: En Revista: Sci Rep Año: 2022 Tipo del documento: Article Pais de publicación: Reino Unido