Articolo in rivista, 2023, ENG, 10.3390/molecules28010072
Ghezzi F.; Donnini R.; Sansonetti A.; Giovanella U.; La Ferla B.; Vercelli B.
1: Istituto per la Scienza e Tecnologia dei Plasmi, CNR-ISTP, Via Cozzi 53, 20125 Milano, Italy 2,6: Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia, CNR-ICMATE, Via Cozzi 53, 20125 Milano, Italy 3: Istituto di Scienze del Patrimonio Culturale, CNR-ISPC, Via Cozzi 53, 20125 Milano, Italy 4: Istituto di Scienze e Tecnologie Chimiche "Giulio Natta", CNR-SCITEC, Via Alfonso Corti 12, 20133 Milano, Italy 5: Dipartimento di Biotecnologie e di Bioscienze, Università degli Studi di Milano-Bicocca, Piazza della Scienza 2, 20126 Milano, Italy
The knowledge of the ways in which post-synthesis treatments may influence the properties of carbon quantum dots (CDs) is of paramount importance for their employment in biosensors. It enables the definition of the mechanism of sensing, which is essential for the application of the suited design strategy of the device. In the present work, we studied the ways in which post-synthesis thermal treatments influence the optical and electrochemical properties of Nitrogen-doped CDs (N-CDs). Blue-emitting, N-CDs for application in biosensors were synthesized through the hydrothermal route, starting from citric acid and urea as bio-synthesizable and low-cost precursors. The CDs samples were thermally post-treated and then characterized through a combination of spectroscopic, structural, and electrochemical techniques. We observed that the post-synthesis thermal treatments show an oxidative effect on CDs graphitic N-atoms. They cause their partially oxidation with the formation of mixed valence state systems, [CDs]0+, which could be further oxidized into the graphitic N-oxide forms. We also observed that thermal treatments cause the decomposition of the CDs external ammonium ions into ammonia and protons, which protonate their pyridinic N-atoms. Photoluminescence (PL) emission is quenched.
Molecules (Basel, Online) 28 , pp. 72 -1–72 -12
nitrogen-doped carbon quantum dots, hydrothermal synthesis, thermal treatment, optical and electrochemical properties
Ghezzi Francesco Mauro, Sansonetti Antonio, Vercelli Barbara, Giovanella Umberto, Donnini Riccardo
ICMATE – Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia, ISPC – Istituto di Scienze del Patrimonio Culturale, ISTP – Istituto per la Scienza e Tecnologia dei Plasmi, SCITEC – Istituto di Scienze e Tecnologie Chimiche "Giulio Natta"
ID: 475523
Year: 2023
Type: Articolo in rivista
Creation: 2022-12-22 11:08:52.000
Last update: 2023-07-04 16:32:22.000
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:475523
DOI: 10.3390/molecules28010072
Scopus: 2-s2.0-85145844471
ISI Web of Science (WOS): 000908706000001