Comment on “Characterization of Self-Assembled Monolayers on Silver and Gold Using Surface Plasmon Resonance Spectroscopy”

Peterlinz, Kevin A.; Georgiadis, R.

doi:10.1021/jp971358t

Cited by 16 publications

(10 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For thin films, any number of different combinations of d f and ε f may be found to fit the reflectance data. Consequently, thin-film thicknesses determined from a single measurement have high uncertainty. , Most researchers resort to assuming a fixed value for the film dielectric constant on the basis of the known chemical properties of the film. The best-fit value for the thickness of the thin film can be determined from fitting analysis of the measured reflectance data to a multilayer optical reflectance model in which all other optical parameters are held fixed at assumed values.…”

Section: Resultsmentioning

confidence: 99%

“…Our error analysis is concerned with two-color SPR, a technique that is intrinsically sensitive to the relative dispersion of the adsorbed film and bulk solution. This method, developed in our laboratory for quantitative measurements of surface coverage of thin films at gold and other metal surfaces, can be more than 1 order of magnitude more sensitive than single-color methods. , …”

mentioning

confidence: 99%

See 1 more Smart Citation

Temperature-Dependent Refractive Index Determination from Critical Angle Measurements: Implications for Quantitative SPR Sensing

Grassi

Georgiadis

1999

Anal. Chem.

View full text Add to dashboard Cite

Temperature-dependent measurements of surface coverage and interfacial kinetics remain relatively unexploited in thin-film sensing applications that rely on optical surface-sensitive techniques such as surface plasmon resonance spectroscopy (SPR). These techniques are inherently sensitive to the optical properties of the bulk solution in contact with the thin film; therefore, quantitative thin-film sensing requires accurate refractive index data for bulk solutions at the conditions of interest. The refractive index for bulk solutions depends strongly on temperature, solution composition, and optical excitation wavelength. In this paper, we demonstrate the use of critical angle measurements for accurate, independent determination of the refractive index of bulk solutions and present results for different experimental conditions of solution temperature, solution concentration, and excitation wavelength. We also examine the implications of incorrect accounting of the bulk solution for the case of two-color SPR sensing of ultrathin organic films. This sensing technique, which depends inherently on the contrast in the dispersion of the refractive index of the film and the bulk solution, can be over 1 order of magnitude more sensitive than single-color SPR measurements. Critical angle measurements can be implemented in conjunction with SPR measurements and will be invaluable for thin film sensing application in which the bulk refractive index varies during the experiment, for example, in temperature-dependent SPR measurements, or for applications in which the solution refractive index is not known.

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Temperature-Dependent Refractive Index Determination from Critical Angle Measurements: Implications for Quantitative SPR Sensing

Grassi

Georgiadis

1999

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…Generally, these materials have widely been found to form self-assembly on metal surfaces [97][98][99][100][101][102][103]. However, they have been shown to produce highly stable and robust colloidal systems as well [6,97,99,100,[104][105][106][107][108][109]. Stabilizers like alkylamines or carboxylates, which are more weakly anchored to metal cores, compared to thiols have also been studied to some extent [16,110].…”

Section: Stabilization Of Metal Nanoparticlesmentioning

confidence: 99%

Ligand-stabilized metal nanoparticles in organic solvent

Nath

Jana

Pradhan

et al. 2010

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…The classical capping agents for metal-containing colloidal cores (metal, oxide, or chalcogenide particles) are long-chain alkanethiols or their oxidized form, disulfides. − …”

Section: Introductionmentioning

confidence: 99%

“…These materials were first introduced for purposes of self-assembly on metal surfaces. ,− However, they have been shown to produce highly stable and robust colloidal systems as well. − Other capping agents that have been studied to some degree involve alkylamines or carboxylates, which are more weakly anchored to metal cores, compared to thiols . An in-depth discussion of capping of nanoparticles with various capping agents and related studies has been given by Murray and Willner, where additional important references can be found.…”

Section: Introductionmentioning

confidence: 99%

Xanthate Capping of Silver, Copper, and Gold Colloids

et al. 2002

View full text Add to dashboard Cite

We cap silver, copper, and gold nanocolloids with long-chain alkylxanthates. In comparison to thiol capping, the particles are less hydrophobic and are stable in aqueous solutions for over a month, though being less stable than the corresponding oleate-capped particles. They can be transferred into relatively polar organic media (such as dichloromethane) but not into nonpolar solvents (such as dodecane). Unlike noncapped, thiol-capped, and oleate-capped colloids, they are temperature sensitive, as a result of the thermal decomposition of the xanthate molecule itself, and can be applied as thermally decomposable colloids. They demonstrate exceptional resistivity toward cyanide-induced corrosion by oxygen, when compared to noncapped or even to oleate-capped colloids. Xanthate capping enables the production of stable copper nanocolloids in aqueous solution under ambient conditions.

show abstract

Comment on “Characterization of Self-Assembled Monolayers on Silver and Gold Using Surface Plasmon Resonance Spectroscopy”

Cited by 16 publications

References 4 publications

Temperature-Dependent Refractive Index Determination from Critical Angle Measurements: Implications for Quantitative SPR Sensing

Temperature-Dependent Refractive Index Determination from Critical Angle Measurements: Implications for Quantitative SPR Sensing

Ligand-stabilized metal nanoparticles in organic solvent

Xanthate Capping of Silver, Copper, and Gold Colloids

Contact Info

Product

Resources

About