Nitrogen doping carbon quantum dots (N-CQDs) are synthesized using o-phenylenediamine as a carbon and nitrogen source via the water hydrothermal method. The size of the obtained N-CQDs is about 5.51 nm, and FTIR results show that their surface contains many –OH and –NH groups. N-CQDs can selectively recognize PA and its homologous (DNP and NP) in the presence of other analytes (including TNT, Tetryl, PETN, RDX, HMX, NC, NG, DNT, NT, NB, DNP, NP, BP, PC, AN, Ca, Cl, Mg, Na, HO). A linear correlation is also observed between PA concentration (0 ∼ 10.0 μmol/L) and N-CQDs fluorescence intensity (0.05 mg/mL) at 556 nm. The linear curve is y = -3.64 × 10x + 404.91, and the detection limit is ∼ 70 nmol/L. The Stern-Volmer graphs lack sufficient linearity, confirming the static quenching interaction between N-CQDs and PA. Finally, the N-CQDs are successfully applied to determine PA content in simulated and real samples quantitatively.

中文翻译：

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制备n掺杂碳量子点用于检测真实爆炸粉尘样品中的PA

以邻苯二胺为碳源和氮源，通过水热法合成氮掺杂碳量子点（N-CQD）。所得N-CQDs的尺寸约为5.51 nm，FTIR结果表明其表面含有许多-OH和-NH基团。 N-CQD 可在其他分析物（包括 TNT、Tetryl、PETN、RDX、HMX、NC、NG、DNT、NT、NB、DNP、NP、BP、PC）存在的情况下选择性识别 PA 及其同源物（DNP 和 NP） 、AN、Ca、Cl、Mg、Na、H2O）。 PA 浓度 (0 ∼ 10.0 μmol/L) 与 N-CQDs 在 556 nm 处的荧光强度 (0.05 mg/mL) 之间也观察到线性相关。线性曲线为 y = -3.64 × 10x + 404.91，检测限为 ∼ 70 nmol/L。 Stern-Volmer 图缺乏足够的线性，证实了 N-CQD 和 PA 之间的静态猝灭相互作用。最后，N-CQD 成功应用于定量测定模拟样品和实际样品中的 PA 含量。