N/S co-doped carbon dots-based solution-gated graphene transistors (SGGT) for ultra-sensitive and selective determination of Hg (II) ions in real water and serum samples

Chenglong Xue, Zhanpeng Ren, Jiaying Wang, Minghua Deng, Jiashen Li, Xianbao Wang, Jinhua Li (Corresponding)

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Abstract

The conventional methods for detecting Hg2+ ions are generally impaired by low sensitivity, a high limit of detection (LOD), and the long detection time required. In this work, we develop a novel solution gated graphene transistor (SGGT) based on carbon dots doped with N and S elements (N/S CDs) as gate electrode probes. The prepared N/S CDs, which are 3–5 nm in diameter, are first modified at the gate of the SGGT through covalent bonding that specifically recognizes Hg2+ ions. The SGGT is then used as a Hg2+ sensor, exhibiting good selectivity, ultrahigh sensitivity, good reproducibility, and a short detection time. The SGGT sensor has an excellent linear detection range, from 0.1 fM to 1 nM. The LOD can reach 28 aM, which is far lower than that of conventional detection methods. Moreover, the SGGT sensor also has a rapid response time of ∼ 40 s. Finally, the ability to analyze real water samples and serum samples is demonstrated.
Original languageEnglish
Article number110626
JournalMicrochemical Journal
Volume201
Early online date24 Apr 2024
DOIs
Publication statusPublished - 1 Jun 2024

Keywords

  • Carbon dots
  • Detection
  • Hg ions
  • SGGT
  • Sensitivity

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