Estimation of dielectric function of biotin-capped gold nanoparticles via signal enhancement on surface plasmon resonance

Article Abstract:

Biotin-capped gold nanoparticles assembled on flat gold with volume fraction f are analyzed by surface plasmon resonance (SPR) spectroscopy and atomic force microscopy (AFM) in order to estimate the dielectric function of the gold nanoparticles based on the Maxwell-Garnett (MG) theory. The SPR response of a surface covered with particles in 2-dimensional aggregates is analyzed and the experimental SPR curve of the particle aggregates has deviated from the theoretical predictions, indicating dipole interactions between particles.

All Other Basic Inorganic Chemical Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Gold Compounds, Observations, Spectra, Atomic force microscopy, Plasmons (Physics), Properties, Maxwell equations

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Dynamic and collective electrochemical responses of tetrathiafulvalene derivative self-assembled monolayers

Article Abstract:

Electroactive tetrathaifulvalene (TTF)-containing alkanethiol self-assembled monolayers (SAMs) are designed and synthesized to elucidate the relationship between electrochemical responses and film structures. Results reveal that TTF-based SAMs exhibited collective electrochemical responses induced by dynamic structural changes, depending on the degree of freedom for the component molecules in the SAMs.

Monomolecular films, Alkanes, Electrochemical reactions

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Cationic self-assembled monolayers composed of gemini-structured dithiol on gold: A new concept for molecular recognition because of the distance between adsorption sites

Article Abstract:

Cationic self-assembled monolayers (SAMs) composed of quaternary ammonium (QA) sulfur derivatives are synthesized to control the distance between charged headgroups on gold substrates. The methods used for this purpose are the surface plasmon resonance spectroscopy (SPR), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared-reflection adsorption spectroscopy (FTIR-RAS).

All Other Basic Organic Chemical Manufacturing, Industrial Organic Chemicals, Quaternary Ammonium Salts, Usage, Molecular structure, Photoelectron spectroscopy, Quaternary ammonium compounds

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