Rippled and Helical MoS2 Nanowire Catalysts: An Aberration Corrected STEM Study

被引：16

作者：

Deepak, Francis Leonard ^{[1
,2
]}

Esparza, Rodrigo ^{[1
]}

Borges, Belsay ^{[1
,3
]}

Lopez-Lozano, Xochitl ^{[1
]}

Jose-Yacaman, Miguel ^{[1
]}

机构：

[1] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA

[2] Int Iberian Nanotechnol Lab, P-4715 Braga, Portugal

[3] Univ Simon Bolivar, Dept Quim, Caracas 1080 A, Venezuela

来源：

CATALYSIS LETTERS | 2011年 / 141卷 / 04期

关键词：

MoS2; Hydrodesulphurization; catalysts; HAADF-STEM; TRANSMISSION ELECTRON-MICROSCOPY; ATOMIC-SCALE; HYDRODESULFURIZATION CATALYSTS; HYDROTREATING CATALYSTS; MOS2-BASED CATALYSTS; STABLE SHAPES; NANOCLUSTERS; MORPHOLOGY; DIBENZOTHIOPHENE; NANOPARTICLES;

D O I：

10.1007/s10562-011-0550-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Aberration corrected (C-s) scanning transmission electron microscopy (STEM) has been used for the first time to characterize MoS2 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.

引用

页码：518 / 524

页数：7

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