Rippled and helical MoS2 nanowire catalysts: An aberration corrected STEM study

Francis Leonard Deepak; Rodrigo Esparza; Belsay Borges; Xóchitl López-Lozano; Miguel Jose-Yacaman

doi:10.1007/s10562-011-0550-1

Rippled and helical MoS₂ nanowire catalysts: An aberration corrected STEM study

Francis Leonard Deepak, Rodrigo Esparza, Belsay Borges, Xóchitl López-Lozano, Miguel Jose-Yacaman

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Aberration corrected (C_s) scanning transmission electron microscopy (STEM) has been used for the first time to characterize MoS ₂ catalysts (supported on Al₂O₃ substrates) to provide detailed information of its shape and structure. The high-resolution imaging reveals unprecedented morphologies present in the MoS₂ catalyst that have never been observed before with other experimental techniques because of the insufficient image contrast and/or resolution. High angle annular dark field (HAADF)-STEM images shows very clearly that the catalyst is formed by elongated chains with a twisted and helical structure. Based on the HAADF-STEM images, we built three atomic models to illustrate the different morphologies found in the MoS₂ catalyst. The existence of these nanostructures opens the posibility for novel catalyticaly active edge morphologies in MoS₂-based nanocatalysts. Graphical Abstract: [Figure not available: see fulltext.]

Original language	English (US)
Pages (from-to)	518-524
Number of pages	7
Journal	Catalysis Letters
Volume	141
Issue number	4
DOIs	https://doi.org/10.1007/s10562-011-0550-1
State	Published - Apr 2011
Externally published	Yes

Keywords

HAADF-STEM
Hydrodesulphurization
MoS
catalysts

ASJC Scopus subject areas

Catalysis
General Chemistry

Access to Document

10.1007/s10562-011-0550-1

Cite this

@article{5daeabaa93ff48dd87d31b8238b61a8b,

title = "Rippled and helical MoS2 nanowire catalysts: An aberration corrected STEM study",

abstract = "Aberration corrected (Cs) scanning transmission electron microscopy (STEM) has been used for the first time to characterize MoS 2 catalysts (supported on Al2O3 substrates) to provide detailed information of its shape and structure. The high-resolution imaging reveals unprecedented morphologies present in the MoS2 catalyst that have never been observed before with other experimental techniques because of the insufficient image contrast and/or resolution. High angle annular dark field (HAADF)-STEM images shows very clearly that the catalyst is formed by elongated chains with a twisted and helical structure. Based on the HAADF-STEM images, we built three atomic models to illustrate the different morphologies found in the MoS2 catalyst. The existence of these nanostructures opens the posibility for novel catalyticaly active edge morphologies in MoS2-based nanocatalysts. Graphical Abstract: [Figure not available: see fulltext.]",

keywords = "HAADF-STEM, Hydrodesulphurization, MoS, catalysts",

author = "Deepak, {Francis Leonard} and Rodrigo Esparza and Belsay Borges and X{\'o}chitl L{\'o}pez-Lozano and Miguel Jose-Yacaman",

note = "Funding Information: Acknowledgments The authors would like to acknowledge the NSF PREM Grant # DMR 0934218; title: oxide and metal nanoparticles-the interface between life sciences and physical sciences.",

year = "2011",

month = apr,

doi = "10.1007/s10562-011-0550-1",

language = "English (US)",

volume = "141",

pages = "518--524",

journal = "Catalysis Letters",

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publisher = "Kluwer Academic Publishers",

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T1 - Rippled and helical MoS2 nanowire catalysts

T2 - An aberration corrected STEM study

AU - Deepak, Francis Leonard

AU - Esparza, Rodrigo

AU - Borges, Belsay

AU - López-Lozano, Xóchitl

AU - Jose-Yacaman, Miguel

N1 - Funding Information: Acknowledgments The authors would like to acknowledge the NSF PREM Grant # DMR 0934218; title: oxide and metal nanoparticles-the interface between life sciences and physical sciences.

PY - 2011/4

Y1 - 2011/4

N2 - Aberration corrected (Cs) scanning transmission electron microscopy (STEM) has been used for the first time to characterize MoS 2 catalysts (supported on Al2O3 substrates) to provide detailed information of its shape and structure. The high-resolution imaging reveals unprecedented morphologies present in the MoS2 catalyst that have never been observed before with other experimental techniques because of the insufficient image contrast and/or resolution. High angle annular dark field (HAADF)-STEM images shows very clearly that the catalyst is formed by elongated chains with a twisted and helical structure. Based on the HAADF-STEM images, we built three atomic models to illustrate the different morphologies found in the MoS2 catalyst. The existence of these nanostructures opens the posibility for novel catalyticaly active edge morphologies in MoS2-based nanocatalysts. Graphical Abstract: [Figure not available: see fulltext.]

AB - Aberration corrected (Cs) scanning transmission electron microscopy (STEM) has been used for the first time to characterize MoS 2 catalysts (supported on Al2O3 substrates) to provide detailed information of its shape and structure. The high-resolution imaging reveals unprecedented morphologies present in the MoS2 catalyst that have never been observed before with other experimental techniques because of the insufficient image contrast and/or resolution. High angle annular dark field (HAADF)-STEM images shows very clearly that the catalyst is formed by elongated chains with a twisted and helical structure. Based on the HAADF-STEM images, we built three atomic models to illustrate the different morphologies found in the MoS2 catalyst. The existence of these nanostructures opens the posibility for novel catalyticaly active edge morphologies in MoS2-based nanocatalysts. Graphical Abstract: [Figure not available: see fulltext.]

KW - HAADF-STEM

KW - Hydrodesulphurization

KW - MoS

KW - catalysts

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