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Title: Monolayers of thiol-terminated dendrimers on the surface of planar and colloidal gold

Abstract

The synthesis of fourth-generation poly(amido-amine)(PAMAM) dendrimers having terminal groups partially or fully functionalized with thiol groups is described. These thiolated dendrimers form stable monolayers on planar Au substrates. X-ray photoelectron spectroscopy studies reveal that most of the thiol groups on dendrimers having 20% of their terminal primary amine groups functionalized can directly interact with the Au furnace. This suggests that the dendrimer molecules are flexible and arrange themselves so as to maximize the number of Au/thiol interactions. Reduction of tetrachloroauric acid in the presence of thiol-modified dendrimers results in formation of water-soluble, dendrimer-stabilized nanoparticles. The particles are 1.5--2.1 nm in diameter depending on the Au/dendrimer ratio used. Stable nanoparticles can be obtained at Au/dendrimer ratios as large as 120:1.

Authors:
;
Publication Date:
Research Org.:
Texas A and M Univ., College Station, TX (US)
Sponsoring Org.:
USDOE; Robert A. Welch Foundation
OSTI Identifier:
20000006
DOE Contract Number:  
FG03-97ER12212
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 15; Journal Issue: 19; Other Information: PBD: 14 Sep 1999; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; ORGANIC POLYMERS; THIOLS; COLLOIDS; GOLD; LAYERS; MINIATURIZATION; MEASURING INSTRUMENTS; CATALYSTS

Citation Formats

Chechik, V., and Crooks, R.M. Monolayers of thiol-terminated dendrimers on the surface of planar and colloidal gold. United States: N. p., 1999. Web. doi:10.1021/la9817314.
Chechik, V., & Crooks, R.M. Monolayers of thiol-terminated dendrimers on the surface of planar and colloidal gold. United States. doi:10.1021/la9817314.
Chechik, V., and Crooks, R.M. Tue . "Monolayers of thiol-terminated dendrimers on the surface of planar and colloidal gold". United States. doi:10.1021/la9817314.
@article{osti_20000006,
title = {Monolayers of thiol-terminated dendrimers on the surface of planar and colloidal gold},
author = {Chechik, V. and Crooks, R.M.},
abstractNote = {The synthesis of fourth-generation poly(amido-amine)(PAMAM) dendrimers having terminal groups partially or fully functionalized with thiol groups is described. These thiolated dendrimers form stable monolayers on planar Au substrates. X-ray photoelectron spectroscopy studies reveal that most of the thiol groups on dendrimers having 20% of their terminal primary amine groups functionalized can directly interact with the Au furnace. This suggests that the dendrimer molecules are flexible and arrange themselves so as to maximize the number of Au/thiol interactions. Reduction of tetrachloroauric acid in the presence of thiol-modified dendrimers results in formation of water-soluble, dendrimer-stabilized nanoparticles. The particles are 1.5--2.1 nm in diameter depending on the Au/dendrimer ratio used. Stable nanoparticles can be obtained at Au/dendrimer ratios as large as 120:1.},
doi = {10.1021/la9817314},
journal = {Langmuir},
issn = {0743-7463},
number = 19,
volume = 15,
place = {United States},
year = {1999},
month = {9}
}