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Nanomaterials 2013, 3(3), 370-392; doi:10.3390/nano3030370

Alkyl and Aromatic Amines as Digestive Ripening/Size Focusing Agents for Gold Nanoparticles

1
Department of Chemistry, Kansas State University, Manhattan, KS 66506, USA
2
Department of Physics, Kansas State University, Manhattan, KS 66506, USA
*
Author to whom correspondence should be addressed.
Received: 29 May 2013 / Revised: 22 June 2013 / Accepted: 26 June 2013 / Published: 5 July 2013

Abstract

Both long chain alkyl thiols and alkyl amines behave as size focusing agents for gold nanoparticles, a process that is under thermodynamic control. However, amines do not oxidize surface gold atoms while thiols do oxidize surface gold to gold(I) with evolution of hydrogen gas. Therefore, alkyl amines participate in digestive ripening by a different mechanism. The efficiency of alkyl amines for this process is described and compared, and ultimate gold particle size differences are discussed. Reported herein is a detailed investigation of alkyl chain lengths for alkyl amines, aromatic amines (aniline), and unusually reactive amines (2-phenylethyl amine). Also, two methods of preparation of the crude gold nanoparticles were employed: gold ion reduction/inverse micelle vs. metal vaporization (Solvated Metal Atom Dispersion—SMAD).
Keywords: amines; gold nanoparticles; inverse micelle; metal vaporization amines; gold nanoparticles; inverse micelle; metal vaporization
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Sun, Y.; Jose, D.; Sorensen, C.; Klabunde, K.J. Alkyl and Aromatic Amines as Digestive Ripening/Size Focusing Agents for Gold Nanoparticles. Nanomaterials 2013, 3, 370-392.

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