Abstracts Book - IMRC 2018

• SF1-P009
MAGNETIC AND RAMAN STUDY OF NiO NANOPARTICLES
Francisco Ascencio 1 , Roberto Escudero 1
1 Instituto de Investigaciones en Materiales, Materia Condensada y Criogenia, Mexico.
Nickel oxide is a p type semiconductor material, important in the science of
materials due to its multiple applications, which range the field of catalysis,
batteries, sensors, solar cells, among others. On the other hand, it is known that
the properties of materials change at the nanometric scale due to quantum
confinement (increase of the ratio S/V), which is why it is interesting to study the
materials on this scale. In this work, NiO nanoparticles were studied,
emphasizing the size and shape of the nanoparticles. We relate the properties
of shape and size with magnetic properties.
NiO nanoparticles with FCC structure were synthesized by a chemical method,
in which Tannic acid and Nickel (II) nitrate hexahydrate were used as precursor
agents. The nanoparticles were characterized by Transmission electron
microscopy (JEOL JEM-2010F FasTem microscope operated at 200 kV) coupled
with studies of X-ray diffraction XRD (Bruker, D8 Advance) to confirm the
structural properties and size of nanoparticles.
Synthesized samples were studied by Raman spectroscopy to obtain detailed
information about the normal modes of vibration. The characteristic modes of
nickel oxide were observed in the next frequencies:
1) 476.67 cm -1 (Stretching mode)
2) 1069.98 cm -1 (Two phonon (2P) 2LO)
Finally, magnetic measurements (Quantum Design instrument, MPMS equipped
with a SQUID) were made to observe the effect of shape and size of the
nanoparticles. From measurements, antiferromagnetic properties were
observed.
Acknowledgment: Roberto Hernández Reyes for his aid with the Electron
Microscope.
Keywords: NiO Nanoparticles, Raman Spectroscopy, Antiferromagnetism
Presenting authors email: fascencioag@gmail.com