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Molecular perspective of MoS2/Co unsupported catalyst using computer assisted TEM simulations

Published online by Cambridge University Press:  22 February 2012

Manuel Ramos,
Joseph Serrano-Matos,
Eduan Martinez-Soto,
Brenda Torres,
Gilles Berhault,
Domingo Ferrer,
José Rurik Farias-Mancilla and
Russell R. Chianelli
Manuel Ramos*
Affiliation:
Departamento de Física y Matemáticas, IIT –UACJ Cuidad Juárez, México, 32310.Materials Research and Technology Institute, UT-El Paso, El Paso TX.
Joseph Serrano-Matos
Affiliation:
Departamento de Química, Universidad Metropolitana, San Juan, PR.
Eduan Martinez-Soto
Affiliation:
Departamento de Química, Universidad Metropolitana, San Juan, PR.
Brenda Torres
Affiliation:
Materials Research and Technology Institute, UT-El Paso, El Paso TX.
Gilles Berhault
Affiliation:
IRCELYON, CNRS – University of Lyon, Villeurbanne, 69100, France.
Domingo Ferrer
Affiliation:
Microelectronics Research Laboratory, UT-Austin, Austin TX.
José Rurik Farias-Mancilla
Affiliation:
Departamento de Física y Matemáticas, IIT –UACJ Cuidad Juárez, México, 32310.
Russell R. Chianelli
Affiliation:
Materials Research and Technology Institute, UT-El Paso, El Paso TX.
*
*Corresponding author: 450 Ave. Del Charro, Cd. Juárez, Chihuahua. IIT-UACJ, Edificio G Cubículo-A301. E-mail address: manuel.ramos@uacj.mx, maramos1@utep.edu
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Abstract

Understanding the morphology of catalytically active materials has been approached successfully in past decades using field electron microscopy in scanning and transmission modes. In this respect, some simulated TEM measurements for unsupported promoted molybdenum di-sulfide (MoS2/Co) provided some insights about molecular structure in those catalytic layered transition metal sulfides (LTMS). However, due to poor resolution, lack of color enhancement, and other factors, sections of those materials observed under TEM do not resolve the structure by itself; in particular about the localization of cobalt atoms for promoted MoS2 unsupported catalyst. This work concludes an epitaxial growth of MoS2 slabs over (111)-Co9S8 crystallographic plane, with a stacking degree size of 6 slabs. Results presented in here are obtained using experimental HRTEM and TEM simulations using the multi-slice method with a slice thickness of 25 Å and projected potential$f(U) = \sum\limits_{i = 1}^n {a_i e^{(- b_i U^2)} } $, where ai and bi are coefficients to be determined.

Keywords

HRTEMMoS2CatalyticProjected Potential

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Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1373: Symposium S4 – Advanced Structural Materials—2011 , 2012, imrc-1373-s4-28
Copyright
Copyright © Materials Research Society 2012

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References

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