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Enhanced Sensitivity for Electrochemical Detection Using Screen-Printed Diamond Electrodes via the Random

Takeshi Kondo1,2,3, Ikuto Udagawa1, Tatsuo Aikawa1

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Screen-printed electrodes using polyester (PES) resin binder and boron-doped diamond powder (BDDP) offer high sensitivity for electrochemical detection. Higher binder ratios enhance signal-to-background, making them promising for disposable sensors.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sensor Technology

Background:

  • Screen-printed electrodes are crucial for electrochemical sensing.
  • Boron-doped diamond powder (BDDP) offers unique electrochemical properties.
  • Optimizing binder ratios in printed electrodes is key for performance.

Purpose of the Study:

  • To investigate the electrochemical properties of screen-printed diamond electrodes with varying polyester (PES) binder to BDDP ratios.
  • To evaluate their suitability for high-sensitivity electrochemical detection.
  • To compare their performance against conventional BDD electrodes.

Main Methods:

  • Fabrication of screen-printed electrodes with different PES/BDDP weight ratios.
  • Cyclic voltammetry (CV) analysis using Fe(CN)6(3-/4-) redox probe.
  • Copper electrodeposition and elemental mapping.
  • Voltammetric detection of ascorbic acid (AA) and 8-hydroxy-2'-deoxyguanosine (8-OHdG).

Main Results:

  • PES/BDDP ratios of 1.0-2.0 exhibited microelectrode-like CV characteristics.
  • Elemental mapping revealed island structures of BDDP in an insulating PES matrix at high ratios.
  • BDDP-printed electrodes with PES/BDDP ratio = 1.0 showed superior signal-to-background ratios for AA and 8-OHdG detection compared to lower ratios and thin films.
  • The optimized BDDP-printed electrodes demonstrated higher sensitivity and lower background currents.

Conclusions:

  • Screen-printed BDDP electrodes with higher insulating binder ratios are effective for electrochemical detection.
  • These electrodes exhibit enhanced sensitivity and signal-to-background ratios.
  • The developed electrodes are a cost-effective, lightweight, and sensitive alternative to conventional BDD electrodes for disposable applications.