Article thumbnail
Location of Repository

Growth Kinetics of Gold Nanorods Synthesized by a Seed-Mediated Method Under pH Acidic Conditions

By M. Almada, E. D. Ruiz, J. Ibarra Hurtado, N. Hassan, Marcelo Kogan Bocian, R. D. Cadena Nava, M. A. Valdés and J. Juarez

Abstract

A systematic study of the effect of ascorbic acid concentration on the growth kinetics of gold nanorods under pH acidic conditions was done. We employed the seed-mediated approach at pH 1.25 using different ascorbic acid/Au+3 molar ratios. We monitored the gold nanorods growth using UV-Vis spectroscopy and the apparent growth rates were determined fitting the experimental data with a theoretical non-linear Boltzmann function. We found that, under the conditions proven, an increase of the ascorbic acid/Au+3 molar ratio induces a red-shift in the longitudinal surface plasmon resonance, as well as the formation of undesirable by-products. The apparent growth rates show a linear dependence with the increment of ascorbic acid concentration. We determined a range of growth rates from 0.034 to 0.078 min(-1), from the lowest to the highest molar ratio used, respectively; which corresponds to deposition rates from 0.128 to 0.235 atoms per second. A low pH in the growth solution promotes a slower growth nanorods rate, which prevents the drastic blue-shift observed in the synthesis at higher pH and provides an aspect ratio tuning.CONACYT (Mexico) 236185 CONACYT/CONICYT (Mexico) 204393 CONICYT/CONACYT (Chile) 130048 FONDECYT (Chile) 3140487 UNISON-PTC-197 DSA/103.5/14/10

Topics: Gold Nanorods, Kinetic Growth, Anisotropic, SPR
Publisher: 'American Scientific Publishers'
Year: 2016
DOI identifier: 10.1166/jnn.2016.12438
OAI identifier: oai:repositorio.uchile.cl:2250/145608
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://repositorio.uchile.cl/h... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.