Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 2, 1996 | public
Journal Article

Synthesis and Characterization of Hydrophobic, Organically-Soluble Gold Nanocrystals Functionalized with Primary Amines


We report on the synthesis and characterization of 25−70 Å diameter amine-capped gold nanocrystals. In particular, we show how these particles can be prepared by a simple procedure and confirm the particle composition (including the identity of the amine surface passivant) through several materials characterization techniques that include infrared spectroscopy, nuclear magnetic resonance spectroscopy, ultraviolet−visible spectroscopy, mass spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, X-ray diffraction analysis, differential scanning calorimetry, thermogravimetric analysis, and elemental analysis. All physical characterizations are consistent with a charge−neutral amine/gold surface interaction described by a weak covalent bond. The stability of the particles appears to be largely kinetic, rather than thermodynamic, in nature. Comparison of these nanocrystals to amines adsorbed onto bulk Au surfaces indicates that the stability of the nanocrystal/amine system is a finite-size effect.

Additional Information

© 1996 American Chemical Society. Received 6 May 1996. Published online 2 October 1996. Published in print 1 January 1996. We would like to thank Professor Bill Gelbart, Professor Robin Garrell, Professor David Myles, and Ms. Pam Ohara for helpful discussions. We also acknowledge Kibbey Stovall for performing the XPS measurements. This work was supported by a grant from the National Science Foundation-NYI program and by a David and Lucille Packard Fellowship.

Additional details

August 19, 2023
October 18, 2023