Title of Paper:Solvothermal conversion of coal into nitrogen-doped carbon dots with singlet oxygen generation and high quantum yield

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Date of Publication:2017-07-15

Journal:CHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI

Volume:320

Page Number:570-575

ISSN No.:1385-8947

Key Words:Coal; Anthracite; Carbon; Nitrogen-doped carbon dots; Preparation; Solvothermal approach; Singlet oxygen generation; Quantum yield; Yield

Abstract:Fluorescent nitrogen-doped carbon dots (N-CDs) are synthesized by a facile one-pot solvothermal approach from Taixi anthratite in the presence of dimethyl formamide (DMF). Benefiting from superior dispersion of light components in DMF and easy exfoliation of smaller sp(2)-carbon structures from the anthracite, the as-prepared N-CDs show a strong photoluminescence (PL) with a high quantum yield (QY) of 47.0% and production yield of 25.6 wt%. Besides, the N-CDs also exhibit a singlet oxygen (102) generation behavior with a 102 generation QY of 19.0%. Moreover, the as-obtained N-CDs emit blue PL under the excitation wavelength of 365 nm, and can be easily dispersed in polymethyl methacrylate (PMMA), retaining the inherent advantages of the N-CDs and the PMMA matrix. The possible mechanism involved in the formation of N-CDs is proposed and discussed in terms of the macromolecular structure of the anthracite and the solvothermal approach adopted in the study. (C) 2017 Published by Elsevier B.V.