Abstracts Book - IMRC 2018

• SA2-P001
SYNTHESIS AND OPTICAL PROPERTIES OF Au-Ag BIMETALLIC
NANOSTRUCTURES
Ricardo Andres Britto Hurtado 1 , Manuel Cortez Valadez 1 , Mario Flores Acosta 1 , Humberto
Arizpe Chávez 1
1
Universidad de Sonora, Departamento de Investigación en Física, Mexico.
The synthesis of bimetallic nanomaterials has been increasing in the last decade
due to its unique physic-chemical properties and its nanotechnological
applications in catalytic activity, optoelectronics, chemical sensors and
treatments against tumor diseases. We present in this report a novel bottom-up
synthesis method for obtaining bimetallic nanoalloys (random, nanowirenetworks
and hollow nanospheres) of Au-Ag at room temperature. The
nanostructures were characterized using TEM, EDS and UV-Vis. TEM images
corroborated the presence of random nanoparticles with a uniform quasi
spherical geometry with sizes between 10-20 nm. In the case of nanowirenetworks
and hollow nanospheres, it had showed a diameter of approximately
11 nm and 70-130 nm respectively. The interplanar distances found at 0.24 nm
and 0.23 nm correspond to the values reported in the literature for a crystal
lattice for gold (1 0 1) and for silver in the bulk (1 1 1). The EDS spectrum showed
the coexistence of gold and silver in the nanostructures. The UV-Vis spectra
showed evidence that the alloys had been formed, due to the shift of the surface
resonance plasmon (SPR) bands, which showed absorption peaks centered at
480 nm, 385 nm, and 643 nm for the random alloys, nanowire-networks and
hollow nanospheres respectively.
Acknowledgment: Special thanks to “Departamento de Física de la Universidad
de Sonora” for the TEM measurements. We are grateful to Solid State
Laboratory (Universidad de Sonora, DIFUS) for optical absorption
measurements. Special thanks to the support given by DCEN (División de
Ciencias Exactas y Naturales) in Universidad de Sonora through
USO315001053 and USO315000709 projects. The author M Cortez-Valadez is
grateful to “Cátedras CONACYT” for the support granted to develop this work.
Keywords: Bimetallic nanoalloys, Au-Ag Nanowire-networks, Au-Ag Hollow
Nanospheres
Presenting authors email: ricardoabritto@gmail.com