Direct Visualization of Independent Ta Centers Supported on Two-Dimensional TiO2 Nanosheets

Zhenyu Bo, Nicholas E. Thornburg, Lingxuan Peng, Jose Julio Gutierrez Moreno, Michael Nolan, Laurence D. Marks, Justin M. Notestein

Research output: Contribution to journalArticle

Abstract

Highly dispersed, supported oxides are ubiquitous solid catalysts but can be challenging to characterize with atomic precision. Here, it is shown that crystalline anatase TiO2 nanosheets (∼5 nm thick) are ideal supports for imaging highly dispersed active sites. Ta cations were deposited by several routes, and high-resolution high angle annular dark-field scanning transmission electron microscopy was used to determine the location of Ta with respect to the TiO2 lattice and quantify Ta-Ta distances. In the best case, it is shown that >80% of Ta atoms are isolated from one another, whereas other techniques are blind to this critical catalytic property or give only qualitative estimates. TiO2 nanosheets may prove to be a useful platform for other types of catalysis studies.

Original languageEnglish
JournalNano letters
DOIs
Publication statusAccepted/In press - Jan 1 2019

Fingerprint

Nanosheets
anatase
catalysis
Visualization
platforms
routes
catalysts
cations
transmission electron microscopy
scanning electron microscopy
oxides
high resolution
estimates
Titanium dioxide
Oxides
Catalysis
atoms
Cations
Positive ions
Crystalline materials

Keywords

  • HAADF STEM
  • microscopy
  • oxides
  • single atom catalysts
  • supported catalysts

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Direct Visualization of Independent Ta Centers Supported on Two-Dimensional TiO2 Nanosheets. / Bo, Zhenyu; Thornburg, Nicholas E.; Peng, Lingxuan; Gutierrez Moreno, Jose Julio; Nolan, Michael; Marks, Laurence D.; Notestein, Justin M.

In: Nano letters, 01.01.2019.

Research output: Contribution to journalArticle

Bo, Zhenyu ; Thornburg, Nicholas E. ; Peng, Lingxuan ; Gutierrez Moreno, Jose Julio ; Nolan, Michael ; Marks, Laurence D. ; Notestein, Justin M. / Direct Visualization of Independent Ta Centers Supported on Two-Dimensional TiO2 Nanosheets. In: Nano letters. 2019.
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