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Engineering Nitrogen-Doped Carbon Quantum Dots: Tailoring Optical and Chemical Properties through Selection of Nitrogen Precursors.
Nguyen, Kiem G; Hus, Matej; Baragau, Ioan-Alexandru; Bowen, James; Heil, Tobias; Nicolaev, Adela; Abramiuc, Laura Elena; Sapelkin, Andrei; Sajjad, Muhammad Tariq; Kellici, Suela.
Afiliación
  • Nguyen KG; School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK.
  • Hus M; Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Ljubljana, SI-1001, Slovenia.
  • Baragau IA; Association for Technical Culture of Slovenia (ZOTKS), Zaloska 65, Ljubljana, 1000, Slovenia.
  • Bowen J; Institute for the Protection of Cultural Heritage of Slovenia (ZVKDS), Poljanska 40, Ljubljana, 1000, Slovenia.
  • Heil T; School of Engineering, London South Bank University, 103 Borough Road, London, SE1 0AA, UK.
  • Nicolaev A; National Institute of Materials Physics, Atomistilor 405A, Magurele, Ilfov, 077125, Romania.
  • Abramiuc LE; School of Engineering and Innovation, Open University, Walton Hall, Milton Keynes, MK7 6AA, UK.
  • Sapelkin A; Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14476, Potsdam, Germany.
  • Sajjad MT; National Institute of Materials Physics, Atomistilor 405A, Magurele, Ilfov, 077125, Romania.
  • Kellici S; National Institute of Materials Physics, Atomistilor 405A, Magurele, Ilfov, 077125, Romania.
Small ; 20(24): e2310587, 2024 Jun.
Article en En | MEDLINE | ID: mdl-38546418
ABSTRACT
The process of N-doping is frequently employed to enhance the properties of carbon quantum dots. However, the precise requirements for nitrogen precursors in producing high-quality N-doped carbon quantum dots (NCQDs) remain undefined. This research systematically examines the influence of various nitrogen dopants on the morphology, optical features, and band structure of NCQDs. The dots are synthesized using an efficient, eco- friendly, and rapid continuous hydrothermal flow technique. This method offers unparalleled control over synthesis and doping, while also eliminating convention-related issues. Citric acid is used as the carbon source, and urea, trizma base, beta-alanine, L-arginine, and EDTA are used as nitrogen sources. Notably, urea and trizma produced NCQDs with excitation-independent fluorescence, high quantum yields (up to 40%), and uniform dots with narrow particle size distributions. Density functional theory (DFT) and time-dependent DFT modelling established that defects and substituents within the graphitic structure have a more significant impact on the NCQDs' electronic structure than nitrogen-containing functional groups. Importantly, for the first time, this work demonstrates that the conventional approach of modelling single-layer structures is insufficient, but two layers suffice for replicating experimental data. This study, therefore, provides essential guidance on the selection of nitrogen precursors for NCQD customization for diverse applications.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Small Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2024 Tipo del documento: Article Pais de publicación: Alemania
Texto completo
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XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Small Asunto de la revista: ENGENHARIA BIOMEDICA Año: 2024 Tipo del documento: Article Pais de publicación: Alemania