AuNP-Modified Electrochemical Heavy Metal Ion Sensors Based on an AAO Hard Mask

Lu Yu Zhao, Lei Han, Jie Lin, Guo Peng Li, Hao Yuan Shen, Yi Wen Wu, Xiao Liang Guo*, Lu Lu Zhang*, Yu Tao Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Heavy metals are widely found in various substances in human life and industrial production, causing serious harm to humans and the environment. In this paper, we proposed a gold nanoparticle (AuNP)-modified sensor for heavy metal detection (Pb2+, Cu2+). With a simple and controllable AuNP modification method based on an anodic aluminum oxide (AAO) hard mask, the detection performance of the electrochemical sensors was improved. Meanwhile, the pH and enrichment time are optimized to obtain optimal detection conditions for as-fabricated sensors. Compared with the traditional methods for the detection of heavy metal ions, as-fabricated sensors have a wider linear range (Cu2+: 0.5-200 μg/L; Pb2+: 20-200 μg/L), lower detection limit (10-6 g/L), and smaller size (5.5 cm × 2.5 cm). Meanwhile by designing an adaptive hardware detection circuit, these sensors demonstrate reusable and portable performance with lower cost. This work will play an increasingly important role in the fields of environmental monitoring, biomedicine, and food safety.

Original languageEnglish
Pages (from-to)6554-6560
Number of pages7
JournalACS Applied Electronic Materials
Volume6
Issue number9
DOIs
Publication statusPublished - 24 Sept 2024

Keywords

  • AAO hard mask
  • AuNPs
  • Electrochemical sensor
  • Heavy metal ion detection
  • Screen-printed electrodes

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