Adsorption kinetics of charged thiols on gold nanoparticles

Bellino, Martín G.; Calvo, Ernesto J.; Gordillo, Gabriel Jorge

doi:10.1039/b312252b

Cited by 97 publications

(106 citation statements)

References 31 publications

(45 reference statements)

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“…The corresponding kinetic plots are shown in Figure 6. The observed profiles are consistent with a very fast ligand exchange process (t 1/2 < 10 s) followed by a slower agglomeration process, similar to the behavior reported by Bellino et al 44 for a positively charged ligand. 11-Mercaptoundecanoic acid (mua) has also been employed in the stabilization of gold nanoparticles.…”

Section: Ligand Substitution and Agglomeration Of Gold Nanoparticlessupporting

confidence: 76%

“…The kinetics of interaction of citrate stabilized gold nanoparticles, cit-AuNPs, with the negatively charged ligand 3-mercapto-1-propane sulfonate (mps) and the positively charged 2-mercaptoethylammonium (mea) has been investigated by Bellino et al 44 by monitoring the changes in the electronic spectra as a function of time ( Figure 5). These two systems exhibited a rather distinct behavior.…”

Section: Ligand Substitution and Agglomeration Of Gold Nanoparticlesmentioning

confidence: 99%

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The coordination chemistry at gold nanoparticles

Toma¹,

Zamarion²,

Toma³

et al. 2010

J. Braz. Chem. Soc.

119

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Nas nanopartículas de ouro, as propriedades químicas e físicas são ditadas principalmente pelos átomos da superfície, os quais podem interagir com espécies doadoras-aceitadoras, ou ligantes, da mesma forma que os complexos metálicos correspondentes. Além disso, os elétrons podem entrar em ressonância com a luz incidente dando origem aos plasmons de superfície, que levam à intensificação do campo elétrico local e ao efeito SERS, proporcionando uma ampla variedade de aplicações na química, biologia e nanotecnologia. Ligantes de ponte, multifuncionais, podem ser usados para intermediar a ligação de íons metálicos aos átomos de ouro da superfície. Essa estratégia permite controlar a estabilização em solução através das cargas dos complexos metálicos, acrescentando, ao mesmo tempo, novas características químicas e maior funcionalidade às nanopartículas modificadas. Dessa forma, uma nova química de coordenação pode ser vislumbrada, combinando nanopartículas metálicas, como as de ouro, e complexos, à luz da química supramolecular e dos efeitos de ressonância plasmônica de superfície.In gold nanoparticles the surface metal atoms play a major role, determining their chemical and physical properties by interacting with donor-acceptor species or ligands in a similar way as the related metal complexes. In addition, coherent oscillations of the metal electrons in resonance with the frequency of the exciting light give rise to localized surface plasmons responsible for an enhancement of the local electric field and SERS effect, allowing a wide range of applications in chemistry, biology and nanotechnology. Multifunctional bridging ligands can be employed for simultaneously binding metal ions and surface atoms. The attractive point of this approach is the possibility of exploiting the charge controlled stabilization by the metal complexes, while imparting new characteristics and properties to the modified nanoparticles. As a matter of fact, a new, exciting field of coordination chemistry can be envisaged, combining metal nanoparticles and metal complexes, in the light of supramolecular and surface plasmon resonance effects.

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Section: Ligand Substitution and Agglomeration Of Gold Nanoparticlessupporting

confidence: 76%

Section: Ligand Substitution and Agglomeration Of Gold Nanoparticlesmentioning

confidence: 99%

The coordination chemistry at gold nanoparticles

Toma¹,

Zamarion²,

Toma³

et al. 2010

J. Braz. Chem. Soc.

119

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“…1c,d) formed smaller clusters according to TEM with greater interparticle spacing than P44-and P14-coated nanoparticles. The clusters seen in TEM for P45-and P46-modified particles were not detected in the solution using either DLS or UV-Vis, except after the particles had interacted with the peptides for more than 1 h. This suggests that the clusters seen by TEM may form because of (1) drying effects, (2) formation of a stabilizing coating to the colloid upon P45 and P46 binding, similar to that seen in histidine-rich epitope-stabilized nanoclusters [19], or (3) a difference in the adsorption kinetics of a positively charged vs negatively charged peptide, similar to that seen in charged alkanethiols [20].…”

Section: Resultsmentioning

confidence: 81%

Tunable Assembly of Peptide-coated Gold Nanoparticles

et al. 2007

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The interaction between peptides and gold surfaces has increasingly been of interest for bionanotechnology applications. To more fully understand how to control such interactions, we have studied the optical properties of peptide-modified gold nanoparticles as a function of peptide composition, pH of the surrounding medium, and peptide concentration. We show using localized surface plasmon resonance, transmission electron microscopy, and surface-enhanced Raman scattering (SERS) that selected "gold-binding peptides" (GBPs), similar to those isolated for binding to gold films using yeast display, can bind to gold nanoparticles at a variety of pHs. Peptide modifications of nanoparticles can lead to irreversible particle aggregation when the pH of the solution is kept below the isoelectric point (pI) of the peptide. However, at pHs above the peptide's pI, particles remain stable in solution, and peptides remain bound to the particles possibly through amine coordination of gold. Additionally, we demonstrate the potential in using SERS for the direct detection of GBPs on gold-silica nanoshells, eliminating the need for indirect labeling methods.

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“…Finally, the absorption spectrum of S2 presents all the same peaks that appear for S1 plus an extra redshifted absorption at ϳ680 nm. 25 Based on a previous work this latter feature is assigned to interacting gold nanoparticle plasmons. 21 Its presence is compatible with the increased amount of gold nanoparticle clusters and the more compact structure observed and discussed through the abovepresented AFM images.…”

Section: A Structural Characterizationmentioning

confidence: 99%

“…Colloidal gold was prepared following the procedure reported by Griffin Freeman et al by reduction of HAuCl 4 with citrate and particle size was verified by transmission electron microscopy ͑TEM͒ and light scattering as reported elsewhere. 25 Finally, S4 is a reference PAH-Os+ ͑PVS/ PAH-Os͒ 5 film, without gold nanoparticles, used for comparison purposes. Here PVS means poly͑vinyl͒sulphonate.…”

Section: Samples and Experimental Setupmentioning

confidence: 99%