University of Limerick
Browse

Enhanced electrochemiluminescence and charge transport through films of metallopolymer-gold nanoparticle composites

Download (3.74 MB)
journal contribution
posted on 2022-11-25, 15:23 authored by A. Devadoss, A.M. Spehar-Déleze, David TannerDavid Tanner, P. Bertoncello, R. Marthi, Tia E. Keyes, R.J. Foster
Water-soluble 4-(dimethylamino) pyridine (DMAP) stabilized gold nanoparticles (DMAP-AuNP) were synthesized by ligand exchange and phase transfer (toluene/water). The DMAP-AuNPs are positively charged with the core diameter of 4 +/- 1 nm. Metallopolymer-gold nanocomposites were prepared by mixing gold nanoparticles and [Ru(bpy)(2)PVP(10)](ClO(4))(2), in water at different mole ratios: bpy is 2,2'-bipyridyl and PVP is poly (4-vinylpyridine). The photoluminescence emission intensity of the metallopolymer decreases with increasing AuNP loading and approximately 57% of the emission intensity is quenched when the Au NP:Ru mole ratio is 14.8 x 10(-2). The rate or homogeneous charge transfer through thin layers of the nanocomposite deposited oil glassy carbon electrodes increases with increasing nanoparticle loading. The homogeneous charge transport diffusion coefficient, D(CT)., for the composite (AuNP:Ru mole ratio 13.2 x 10(-2)) is (2.8 +/- 0.8) X 10(-11) cm(-2) s(-1) and is approximately 3-fold higher than that found for the pure metallopolymer. Significantly, despite the ability of the metal nanoparticles to quench the ruthenium-based emission, the electrochemiluminescence of the nanocomposite with a AuNP:Ru mole ratio of 4.95 x 10(-2) is approximately three times more intense than the parent metallopolymer. This enhancement arises from the increased rate of charge transport that leads to it greater number of excited states per unit time while minimizing lie quenching effects. The implications of these findings for the design of electrochemiluminescent sensors are discussed.

History

Publication

American Chemical Society;

Note

peer-reviewed

Other Funding information

SFI, DCU Research Fellowship, Marie Curie-Sklodowska Action (MCSA)

Rights

Repinted with permission from Lanmuir, 2010, 26(3), pp. 3130-2135,Enhanced electrochemiluminescence and charge transport through films of metallopolymer-gold nanoparticle composites. © American Chemical Society, DOI: 10.1021/la902676p

Language

English

Also affiliated with

  • Bernal Institute

Department or School

  • School of Engineering

Usage metrics

    University of Limerick

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC