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|Author(s):||Darwin R. Reyes-Hernandez; Geraldine I. Mijares; Brian J. Nablo; Kimberly A. Briggman; Michael Gaitan;|
|Title:||Trapping and Release of Citrate-Capped Gold Nanoparticles|
|Published:||August 01, 2011|
|Abstract:||An electrical method to trap and release charged gold nanoparticles on and from the surface of alkanethiol self-assembled-monolayer (SAM) modified gold electrodes is presented. Gold nanoparticle (GNP) coated electrodes were formed by immersing amine-terminated SAM-modified gold electrodes into a solution of negatively-charged citrate-capped gold nanoparticles (GNPs). The electrostatic interactions kept the GNPs trapped on the electrode. The presence of the GNPs decreased the impedance of the SAM-modified electrode, and increased the electrochemical activity at at the electrode as shown through cyclic voltammetry. The application of a subsequent negative bias initiated a partial release of the gold nanoparticles. Impedance spectroscopy, cyclic voltammetry, UV-Vis spectrophotometry and AFM imaging were used to monitor the attraction and release of gold nanoparticles to and from the SAM-modified gold electrodes. This work describes a trapping and release method for citrate-capped gold nanoparticles that could find use in applications such as nanotoxicity studies and other microfluidic assays, and functionalization of gold nanoparticles.|
|Citation:||Applied Surface Science|
|Keywords:||gold nanoparticles, electrostatic interactions, self-assembled monolayers|
|PDF version:||Click here to retrieve PDF version of paper (977KB)|