info:eu-repo/semantics/article
Growth Kinetics of Concave Nanocubes Studied by Optical Coherence Tomography
Autor
Yenisey Ponce de Leon
JUAN LUIS PICHARDO MOLINA
NOE ALCALA OCHOA
Institución
Resumen
This work presents the analysis of the growth kinetics of two syntheses of concave gold nanocubes with a mean size of 72 and 108 nm followed by the optical coherence tomography (OCT) technique by acquiring B-scan images each 5 s. In addition, ultra violet-visible (UV-Vis) spectra and mean size from dynamic light scattering (DLS) were acquired during nanoparticle growth to generate kinetic plots
in order to corroborate the OCT results. Kinetic plots from OCT images were obtained by plotting contrast enhancement of B-scan images as function of time. Fitting parameters values given by using the classical Kolmogorov-Johnson- Mehl-Avrami (KJMA) equation show that the growth rate parameter k is higher for small cubes than for large ones, and that the Avrami exponent n associated to the growth kinetics of concave nanocubes is close to 2 for both syntheses. The results of UV-Vis spectroscopy and DLS confirm that
OCT is a viable technique to provide information about nanoparticle growth kinetics. Moreover, to our knowledge, this is
the first time that OCT technique is used to follow nanoparticle growth kinetics.