Regenerable sensor based on tris(4,7′-diphenyl-1,10-phenanthroline)ruthenium (II) for anodic and cathodic electrochemiluminescence applications

Saima Hanif, Zhiyong Dong, Peter John, Abubakar Abdussalam, Pan Hui, Dmytro Snizhko, Mohamed Ibrahim Halawa, Guobao Xu, Shaojun Dong

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Tris(4,7′-diphenyl-1,10-phenanthroline) ruthenium (II) dichloride [Ru(dpp)32+] was used for the first time to construct a regenerable electrochemiluminescence (ECL) sensor. The Ru(dpp)32+-modified carbon paste electrode (CPE) showed several unique features in comparison with commonly studied Ru(bpy)32+-modified electrodes. On the one hand, a quite reversible reduction peak was observed at −0.96 V where no obvious hydrogen evolution occured, enabling the sensitive detection of S2O82−. Moreover, our proposed S2O82− sensor showed a good linear range from 3 × 10−9 to 3 × 10−4 M with a detection limit of 2 nM, indicating higher sensitivity for the same analyte than previously reported ECL methods by about two orders of magnitude. On the other hand, the Ru(dpp)32+-modified electrode showed an irreversible oxidation peak because electrogenerated Ru(dpp)33+ is very reactive in aqueous solutions, while Ru(bpy)32+-modified electrode showed a reversible oxidation peak. Moreover, the present sensor showed a good linear range from 10−7 M to 10−3 M for oxalate with a detection limit of 60 nM. It detected oxalate in urine samples with nice recoveries. The regenerable ECL sensor presented good characteristics, such as low cost, simple fabrication procedure and fast response time. The Ru(dpp)32+ based regenerable sensor is an attractive alternative to Ru(bpy)32+-based regenerable sensor, as it can be used for both anodic and cathodic ECL analysis with high sensitivity in aqueous media.

Original languageEnglish
Article number108313
JournalBioelectrochemistry
Volume149
DOIs
Publication statusPublished - Feb 2023

Keywords

  • Anodic electrochemiluminescence
  • Cathodic electrochemiluminescence
  • Regenerable sensor
  • Tris(4,7′-diphenyl-1,10-phenanthroline) ruthenium (II)

ASJC Scopus subject areas

  • Biophysics
  • Physical and Theoretical Chemistry
  • Electrochemistry

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