electron microscopy
 

HOMEMETHODSINTERACTIONSDOWNLOADSCONTACT
RESEARCH: RECENT HIGHLIGHTSEXAMPLES


 

Recent Research Highlights

       
 

Cryo STEM

Many material are sensitive to the electron beam and undergone modifications during the TEM and STEM investigation. A means to minimize this unwanted effect is cooling the sample with liquid nitrogen. This procedure has recently been utilized to image various perovskite lead halides by HAADF-STEM avoiding the usual decompositition and formation of lead nanoparticles.

Stable Ultra-Concentrated and Ultra-Dilute Colloids of CsPbX3 (X = Cl, Br) Nanocrystals using Natural Lecithin as a Capping Ligand
F. Krieg, Q. K. Ong, M. Burian, G. Rainò, D. Naumenko, H. Amenitsch, A. Süess, M. Grotevent, F. Krumeich, M. I. Bodnarchuk, I. Shorubalko, F. Stellacci, and M. V. Kovalenko
J. Am. Chem. Soc. 2019, 141, 19839-19849 DOI

Scalable Photonic Sources Using Two-Dimensional Lead Halide Perovskite Superlattices
J. Jagielski, S. F. Solari, L. Jordan, D. Scullion, B. Blülle, Y.-T. Li, F. Krumeich, Y.-C. Chiu, B. Ruhstaller, E. J. G. Santos, and C.-J. Shih
Nature Commun.
2020, 11, 387 DOI


 

 

HAADF-STEM image of CsPbBr3 nanocrystals obtained at cryogenic conditions.

       
 

Cover and HAADF-STEM image of single Pt atoms (bright spots) on the carbon support.

 

Single atom catalysis

Single metal atom are becoming increasingly important in heterogeneous catalysis as every atom might be efficient in a process. The fixation on a suitable host material that firmly anchors the metal atoms reduces their tendency to aggregate and sinter. An example are Pt atoms on carboneous materials that are stable catalyst for the industrially important synthesis of vinyl chloride.

Tailoring Nitrogen-Doped Carbons as Hosts for Single-Atom Catalysts
S. Büchele, Z. Chen, S. Mitchell, R. Hauert, F. Krumeich, and J. Pérez‑Ramírez
ChemCatChem 2019, 11, 2812-2820 DOI


Tunability and Scalability of Single-Atom Catalysts Based on Carbon Nitrides
Z. Chen, S. Mitchell, F. Krumeich, R. Hauert, S. Yakunin, M. V. Kovalenko, and J. Pérez-Ramírez, ACS Sustainable Chem. Eng. 2019, 7, 5223–5230 DOI

Nanostructuring unlocks high performance of platinum single-atom catalysts for stable vinyl chloride poduction
S. K. Kaiser, E. Fako, G. Manzocchi, F. Krumeich, R. Hauert, A. Clark, O. V. Safonova, N. López, and Javier Pérez-Ramírez, Nature Catal. 2020, 3, 376–385 DOI

       
 

Details of the Real Structure
of CdxNb6(O,F)16

The structure of CdxNb6(O,F)16 crystallizes in the orthorhombic LiNb6O15F structure type (space group Pmma). Light microscopy and scanning electron microscopy imaging reveals a frequent intergrowth of crystallites on the micrometer scale while HAADF-STEM images show perfect order in most areas. However, a single grain boundary was found with the structures in the adjacent domains tilted by 4° in respect of each other (see image). The adjacent domains are coherently connected in parts of the interface but frequently defects occur at irregular intervals.

A Detailed Structural Analysis of CdxNb6(O,F)16
F. Krumeich and M. Wörle
Z. anorg. allgem. Chem. 2019, 645, 753–757
, DOI

 


HAADF-STEM image showing the defective area (red) between the well-ordered domain (blue and green). The structures in both domains are tilted by ca. 4° in respect of each other.

       
 

Archive

2018
FCC catalysts

2016
Luminescent CsPbI3 nanoparticles/ C-coated FePO4

2015
Functionalized BN / Hollow Zeolites

2014
Single Atoms in Catalysts / Imaging Li in LiBC

2013
Phase Contrast in STEM / Tin Nanocrystals for Battery Applications

2012
Dodecagonal Quasicrystals / Behaviour of Nanoparticles in a Waste Incineration Plant

2011
Catalyst Characterization / Coated Nanoparticles /
Optimization of Catalysts

2010
Cation Ordering in Perovskites / Leaching of ZSM-5 Zeolithes
Cytoxicity of Nanoparticles /
Structure Determination of Bi6S2O15

 

 

Publication lists:

ORCID iD iconorcid.org/0000-0001-5625-1536 ----- Scopus author


ETH Zürich | ETH chemistry department | ETH inorganic chemistry

modified: 28 April, 2020 by F. Krumeich | © ETH Zürich and the authors