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首页> 外文期刊>ACS applied materials & interfaces >Facile Synthesis of N-Doped Carbon Dots as a New Matrix for Detection of Hydroxy-Polycyclic Aromatic Hydrocarbons by Negative-Ion Matrix-Assisted Laser Desorption/lonization Time-of-Flight Mass Spectrometry
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Facile Synthesis of N-Doped Carbon Dots as a New Matrix for Detection of Hydroxy-Polycyclic Aromatic Hydrocarbons by Negative-Ion Matrix-Assisted Laser Desorption/lonization Time-of-Flight Mass Spectrometry

机译：负离子基质辅助激光解吸/电离飞行时间质谱法轻松合成N掺杂碳点作为检测羟基多环芳烃的新基质

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摘要

N-doping carbon dots (N-CDs) were prepared by microwave-assisted pyrolysis of DL-malic acid and ethanol amine as precursors. The material served as an excellent matrix for the detection of the environmental pollutants hydroxypolycyclic aromatic hydrocarbons (OH-PAHs) by matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) in negative ion mode. The obtained N-CDs exhibited good UV absorption capacity and favorable solubility. The use of the N-CDs matrix exhibited low matrix background interference and was beneficial to improve the signal response due to the specific pi-conjugated polyaromatic structure and the doping of nitrogen atoms. The developed method was found to have good reproducibility and sensitivity. The N-CDs as a new matrix also were employed for the detection of OH-PAHs in real PM2.5 samples. The mass concentrations of E-hydroxy-pyrene, E-dihydroxy-anthraquinone, and E-dihydroxy-benzo(a)pyrene on the collected PM2.5 samples ranged from 0.125 to 0.136 ng/m(3), 0.039 to 0.052 ng/m(3), and 0.053 to 0.072 ng/m(3), respectively. This work extends the application field of N-CDs and provides a good candidate of matrix for MALDI-TOF MS detection of environmental pollutants.
机译：通过DL-苹果酸和乙醇胺作为前体的微波辅助热解制备了N掺杂碳点（N-CD）。该材料是通过负离子模式的基质辅助激光解吸/电离飞行时间质谱（MALDI-TOF MS）来检测环境污染物羟基多环芳烃（OH-PAHs）的出色基质。所得的N-CD具有良好的紫外线吸收能力和良好的溶解性。 N-CDs矩阵的使用显示出较低的矩阵背景干扰，并且由于特定的π共轭多芳族结构和氮原子的掺杂而有利于改善信号响应。发现开发的方法具有良好的重现性和灵敏度。 N-CD作为新的基质也被用于检测实际PM2.5样品中的OH-PAH。收集到的PM2.5样品上的E-羟基,、 E-二羟基蒽醌和E-二羟基苯并（a）py的质量浓度范围为0.125至0.136 ng / m（3），0.039至0.052 ng / m m（3）和0.053至0.072 ng / m（3）。这项工作扩展了N-CD的应用领域，并为MALDI-TOF MS检测环境污染物提供了很好的基质候选。

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