Abstracts Book - IMRC 2018

• SA6-P134
STUDY ON THE VOLUME PLASMON BLUE-SHIFT OF METALLIC
BISMUTH NANOPARTICLES SYNTHESIZED BY SOLVOTHERMAL
REACTION
Raul Borja Urby 1 , Herlys Viltres Cobas 2 , Silvia Patricia Paredes Carrera 3 , Francisco Paraguay 4 ,
Damasio Morales Cruz 5 , Arturo García Bórquez 6 , Luis Rendon Vazquez 7 , Patricia Santiago
Jacinto 8
1 Instituto Politécnico Nacional - IPN, Centro de Nanociencias y Micro y Nanotecnologías,
Mexico. 2 Instituto Politécnico Nacional - IPN, Centro de Investigación en Ciencia Aplicada y
Tecnología Avanzada, Mexico. 3 Instituto Politécnico Nacional - IPN, Escuela Superior de
Ingeniería Química e Industrias Extractivas, Mexico. 4 Centro de Investigación en Materiales
Avanzados, S.C., Física de materiales, Mexico. 5 Instituto Politécnico Nacional - IPN, Escuela
Superior de Ingeniería Mecánica y Eléctrica - Zacatenco, Mexico. 6 Instituto Politécnico Nacional
- IPN, Escuela Superior de Física y Matemáticas, Mexico. 7 Universidad Nacional Autónoma de
México, Instituto de Física - Materiales Nanoestructurados, Mexico. 8 Universidad Nacional
Autónoma de México, Instituto de Física - Materia Condensada, Mexico.
Here we present the study of semiconductor properties of bismuth
nanoparticles assembled on bundles. Priority was set on the reaction parameter
pH (7, 4, 2) to obtain narrow distribution size nanoparticles, to studying their
optical absorption properties by electron energy loss spectroscopy (EELS). As
reported by literature, semimetal to semiconductor transition takes place when
particle size decrease to a smaller size than that of the exciton radius. Analysis
on individual bismuth nanoparticle was possible by EELS spectroscopy, in which
the plasmon region is easily accessible. It was found, nanoparticles with
diameter as small as 5.2±1.53 nm assemble in bundles at pH 4, remain stable
and avoided coalesces under electrons irradiation while EELS analysis was
performed at 80 kV. Under such conditions, it was possible to confirm the
semiconductor properties of individual bismuth nanoparticle as the volume
plasmon blue-shifts to a higher energy (29.1 eV), which is related to widening of
the band gap due to size effects in semi-metallic bismuth nanostructures.
Acknowledgment: To Mexico´s National Council of Science and Technology
(CONACYT) for financial support by agreement no.257931.
To CNMN-IPN for experimental support.
Keywords: BISMUTH, PLASMON, EELS
Presenting authors email: r_borja_u@hotmail.com