Abstracts Book - IMRC 2018

• SA6-P152
GROWTH KINETICS AND THERMAL PROPERTIES OF GOLD
NANOSHELL
Angel Netazhual Lopantzi 1 , Delfino Cornejo Monrroy 2 , Noe Sánchez González 3 , Jose Luis
Jiménez Pérez 1 , Oscar Secundino Sánchez 1 , Jose Francisco Sánchez Ramírez 3
1
Instituto Politécnico Nacional - IPN, Unidad Profesional Interdisciplinaria en Ingeniería y
Tecnologías Avanzadas, Mexico. 2 Universidad Autónoma de Ciudad Juárez, Instituto de
Ingeniería y Tecnología, Mexico. 3 Instituto Politécnico Nacional - IPN, Centro de Investigación
en Biotecnología Aplicada, Mexico.
In this work we report the synthesis of gold nanoshells through the depositionprecipitation
method, the technique involved the preparation of SiO2 seed
particles decorated with gold hydroxide nanoparticles and the subsequent
growth of the thin shell using hydrolyzed HAuCl4 as a molecular precursor.
Monodisperse nanospheres with an average size of 150 nm were obtained using
the Stöber technique and using tetraethyl orthosilicate as the molecular
precursor. The peaks at 948 and 1077 cm-1 observed by FTIR spectroscopy
coupled with the silicon signal and oxygen obtained by EDS reveal the exclusive
chemical composition of SiO2. The amino functionalization of the surface of the
SiO2 nuclei was carried out for decoration with gold hydroxide nanoparticles.
The formation of the Au coatings was developed in the presence of the gold
metallic precursor. Five samples were obtained varying the seed / gold ratio 1/1
to 1/9, the Uv-visible spectra reveal a greater intensity of absorption to the near
infrared according to the increment of the hydrolyzed gold, attributing to
uniform growth of the shell with thicknesses of 10 nm that were mainly
observed by TEM. The results of the growth kinetics of the metallic nanoshells
are presented using UV-Vis spectroscopy, these samples were characterized by
technique of thermal lens where there was a diffusivity thermal better when the
coating was complete.
Keywords: Gold nanoshell, Diffusivity, Thermal lens
Presenting authors email: gelo89_@live.com.mx