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/Ionization Time-of-Flight Mass Spectrometry

Wenjing Lu, Yong Li, Ruijin Li, Shaomin Shuang, Chuan Dong*, Zongwei CAI

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

N-doping carbon dots (N-CDs) were prepared by microwave-assisted pyrolysis of dl-malic acid and ethanolamine as precursors. The material served as an excellent matrix for the detection of the environmental pollutants hydroxy-polycyclic 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 π-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 -hydroxy-pyrene, -dihydroxy-anthraquinone, and -dihydroxy-benzo(a)pyrene on the collected PM2.5 samples ranged from 0.125 to 0.136 ng/m3, 0.039 to 0.052 ng/m3, and 0.053 to 0.072 ng/m3, 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.

Original languageEnglish
Pages (from-to)12976-12984
Number of pages9
JournalACS applied materials & interfaces
Volume8
Issue number20
DOIs
Publication statusPublished - 25 May 2016

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • carbon dots
  • hydroxy-polycyclic aromatic hydrocarbons
  • MALDI-TOF MS
  • matrix
  • nitrogen-doped

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