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Self-Assembled Monolayer of Carboxyl-Terminated Poly(amido amine) Dendrimer

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Abstract:

Adlayer formation and adsorption structure of 2.5th-generation poly(amido amine) dendrimer with carboxyl-terminated groups on solid substrates were investigated by atomic force microscopy, surface plasmon resonance spectroscopy, and surface enhanced infrared absorption spectroscopy. Dendrimer molecules are not uniformly adsorbed on solid surface but form aggregates with a width of ∼100 nm and a height less than 1 nm. Adsorption reaches in equilibrium at 100 ∼ 1000 sec, depending on the dendrimer concentration. The adsorption-desorption process is considerably reproducible and repeatable. Although the adsorption at equilibrium increases with dendrimer concentration and reaches maximum at neutral pH, monolayer is always maintained after the desorption with solvent. This indicates the formation of self-assembled monolayer. Such monolayer is preserved even at the variation of pH. Although most carboxylates are protonated at acidic pH, small amount of carboxylate remains even at acidic pH. The adsorption structure of dendrimer was illustrated.

Keywords: ADSORPTION LAYER; ATOMIC FORCE MICROSCOPY; CARBOXYL TERMINAL; INFRARED ABSORPTION SPECTROSCOPY; POLY(AMIDO AMINE) DENDRIMER; SELF-ASSEMBLED MONOLAYER; SURFACE ENHANCED INFRARED ABSORPTION SPECTROSCOPY; SURFACE PLASMON RESONANCE SPECTROSCOPY

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2006.233

Publication date: 2006-06-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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