Sensitive "On-Off" Fluorescent Sensor From N-Doped Carbon Dots for Fe3+ Detection and Anticounterfeiting Applications

Luminescence. 2024 Dec;39(12):e70058. doi: 10.1002/bio.70058.

Abstract

Herein, a kind of N-doped fluorescent carbon dots (N-CDs) were prepared by using melamine and carboxymethyl cellulose (CMC) as precursors through a straightforward hydrothermal method. The designed sensor displayed a uniform nanoscale distribution, excellent hydrophilicity, and strong fluorescence emission with a fluorescence quantum yield of 37.98%. Moreover, the N-CDs could be utilized for Fe3+ detection by the fluorescence "On-Off" transition via the mechanism of internal filtration effect (IFE) and static quenching process. Two good linear relationships within the concentrations of Fe3+ from 10 to 100μM and 100 to 500 μM could be obtained, which indicated that the "On-Off" fluorescent sensor could quantitative analysis of Fe3+ and the calculated detection limit (LOD) was 0.510 μM (3σ/slope). Additionally, the N-CDs could be used for the detection of Fe3+ in the solid phase based on the fluorescence "On-Off" strategy, which is promising for anticounterfeiting application.

Keywords: Fe3+ detection; N‐doped carbon dots; fluorescence probe; fluorescent anticounterfeiting; internal filtration effect.

MeSH terms

  • Carbon* / chemistry
  • Carboxymethylcellulose Sodium / chemistry
  • Fluorescence
  • Fluorescent Dyes* / chemical synthesis
  • Fluorescent Dyes* / chemistry
  • Iron* / analysis
  • Iron* / chemistry
  • Limit of Detection
  • Nitrogen / chemistry
  • Quantum Dots* / chemistry
  • Spectrometry, Fluorescence*
  • Triazines / analysis
  • Triazines / chemistry

Substances

  • Carbon
  • Fluorescent Dyes
  • Iron
  • Carboxymethylcellulose Sodium
  • Triazines
  • melamine
  • Nitrogen