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Supramolecular Approach to Gold Nanoparticle/Triruthenium Cluster Hybrid Materials and Interfaces
Author(s) -
Toma Sergio H.,
Santos Jonnatan J.,
Araki Koiti,
Toma Henrique E.
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201001118
Subject(s) - chemistry , nanoparticle , bipyridine , colloidal gold , polyoxometalate , surface plasmon resonance , raman spectroscopy , nanomaterials , supramolecular chemistry , crystallography , inorganic chemistry , nanotechnology , organic chemistry , crystal structure , physics , optics , catalysis , materials science
A systematic and comprehensive study of the interaction of citrate‐stabilized gold nanoparticles with triruthenium cluster complexes of general formula [Ru 3 (CH 3 COO) 6 (L)] + [L = 4‐cyanopyridine (4‐CNpy), 4,4′‐bipyridine (4,4′‐bpy) or 4,4′‐bis(pyridyl)ethylene (bpe)] has been carried out. The cluster–nanoparticle interaction in solution and the construction of thin films of the hybrid materials were investigated in detail by electronic and surface plasmon resonance (SPR) spectroscopy, Raman scattering spectroscopy and scanning electron microscopy (SEM). Citrate‐stabilized gold nanoparticles readily interacted with [Ru 3 O(CH 3 COO) 6 (L) 3 ] + complexes to generate functionalized nanoparticles that tend to aggregate according to rates and extents that depend on the bond strength defined by the characteristics of the cluster L ligands following the sequence bpe > 4,4′‐bpy >> 4‐CNpy. The formation of compact thin films of hybrid AuNP/[Ru 3 O(CH 3 COO) 6 (L) 3 ] + derivatives with L = bpe and 4,4′‐bpy indicated that the stability/lability of AuNP–cluster bonds as well as their solubility are important parameters that influence the film contruction process. Fluorine‐doped tin oxide electrodes modified with thin films of these nanomaterials exhibited similar electrocatalytic activity but much higher sensitivity than a conventional gold electrode in the oxidation of nitrite ion to nitrate depending on the bridging cluster complex, demonstrating the high potential for the development of amperometric sensors.