Erbium-doped graphene quantum dots with up- and down-conversion luminescence for effective detection of ferric ions in water and human serum

Trung Viet Huynh, Nguyen Thi Ngoc Anh, Win Darmanto, Ruey An Doong

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Herein, the erbium-doped graphene quantum dots (Er-GQDs) with up- and down-conversion fluorescence have, for the first time, been hydrothermally fabricated at lactose-to-erbium pentahydrate ratio of 50, and then employed as the nanosensing probe to detect Fe3+ ions in aqueous and human serum samples. The surface characterization shows that the 1.8 at% Er is successful incorporated into 2–8 nm GQD lattice to form Er-GQD nanoparticles. The Er3+-doped GQDs exhibit both up and down-conversion luminescence properties after excitation with 730-nm visible light and 360-nm UV light, respectively. Both up- and down-conversion fluorescence properties of Er-GQDs show excellent analytical performance toward Fe3+ detection. A wide dynamic range of 4 orders of magnitude with limits of detection of 2.8–11.2 nM is observed when down-conversion property of Er-GQD is used for Fe3+ detection in PBS and human serum. Moreover, both up- and down-conversion fluorescence behaviors exhibit superior selectivity over 16 metal ion and 19 organic interferences. Results clearly indicate the feasibility of using Er-GQDs with both up- and down-conversion fluorescence properties as the nanosensing probe for highly selective and sensitive detection of metal ions in various environmental media, which can extend the application of up-conversion application from inorganic materials to carbon based nanomaterials for label-free detection of analysts in environmental and biological samples.

Original languageEnglish
Article number129056
JournalSensors and Actuators, B: Chemical
Volume328
DOIs
Publication statusPublished - 1 Feb 2021

Keywords

  • Down-conversion
  • Erbium-doped graphene quantum dots (Er-GQDs)
  • Ferric ions
  • Lanthanide
  • Selectivity
  • Up-conversion

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