Enhanced Electrochemiluminescence and Charge Transport Through Films of Metallopolymer-Gold Nanoparticle Composites

Anitha Devadoss, Anna-Maria Spehar-Délèze, David A. Tanner, Paolo Bertoncello, Reena Marthi, Tia E. Keyes, Robert J. Forster

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


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)2PVP10](ClO4)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 × 10−2. The rate of homogeneous charge transfer through thin layers of the nanocomposite deposited on glassy carbon electrodes increases with increasing nanoparticle loading. The homogeneous charge transport diffusion coefficient, DCT, for the composite (AuNP:Ru mole ratio 13.2 × 10−2) is (2.8 ± 0.8) × 10−11 cm2 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 × 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 a greater number of excited states per unit time while minimizing the quenching effects. The implications of these findings for the design of electrochemiluminescent sensors are discussed.

Original languageEnglish
Pages (from-to)2130-2135
Number of pages6
Issue number3
Publication statusPublished - 2 Feb 2010


Dive into the research topics of 'Enhanced Electrochemiluminescence and Charge Transport Through Films of Metallopolymer-Gold Nanoparticle Composites'. Together they form a unique fingerprint.

Cite this