An innovative ECL sensor based on AuNPs linker for Ru(bpy)32+ molecules doped onto an alkaline pretreated poly(4-aminodiphenylamine) film

Mohammed M. Al-Hinaai, Htet H. Kyaw, Salim H. Al-Harthi, Emad A. Khudaish*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


An innovative construction approach relies on incorporation of gold nanoparticles (AuNPs) as a sandwich linking species between two assembled layers composed of tris(2,2′-bipyridyl)ruthenium(II), Ru(bpy)32+. The entire luminescent system is doped at an alkaline treated polymeric film made of poly(4-aminodiphenylamine), t-Padpa, originally deposited at the glassy carbon electrode by repetitive electrochemical scanning. The surface morphology and the composition of the proposed (Ru.AuNPs.Ru.t-Padpa) sensor along with its electrochemical properties were studied using Atomic Force Microscopy (AFM), X-Ray Photoelectron Spectroscopy (XPS) and Electrochemical Impedance Spectroscopy (EIS) methods The analytical performance of the developed sensor and its stability were tested using tripropyl amine (TPA) as a typical co-reactant in the development of ECL sensors. The ECL system shows a remarkable sensitivity towards TPA quantification with a detection limit (3σ) of 10 nM (1.4 ppb). The proposed sensor exhibited a greater efficiency and higher stability over the native ruthenium doped polymer (Ru.t-Padpa) evaluated by its performance for a certain shelf life-time. The present approach confirms the fabrication of a robust and efficient sensor characterized by the parallel operative effects of both AuNPs and the available concentrated surface luminescent molecules.

Original languageEnglish
Pages (from-to)460-468
Number of pages9
JournalSensors and Actuators, B: Chemical
Publication statusPublished - Mar 2018
Externally publishedYes


  • Electrochemiluninescence sensors
  • Gold nanoparticles
  • Poly(4-aminodiphenyl-amine)
  • Tris(bipyridyl) ruthenium(II)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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