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Related Experiment Video

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Application of Monolayer Graphene to Cryo-Electron Microscopy Grids for High-resolution Structure Determination

Application of Monolayer Graphene to Cryo-Electron Microscopy Grids for High-resolution Structure Determination

Published on: November 10, 2023

Complementary microscopy techniques applied for optimizing the structure and performance of graphene-based hybrids.

Wen Qian¹, Zhiqiang Chen, Micah Eastman

¹Department of Physics, Portland State University, Portland, OR 97201, USA.

Ultramicroscopy

|January 27, 2012

Summary

Hybridizing graphene with metal/metal oxide nanocrystals enhances performance for green energy. Energy-filtered transmission electron microscopy (EFTEM) is crucial for optimizing these graphene-based composites.

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Area of Science:

Materials Science
Nanotechnology
Green Energy

Background:

Hybridizing graphene with metal/metal oxide nanocrystals (NCs) is key to enhancing its performance and expanding applications.
Graphene-based hybrids are promising for green energy technologies.

Purpose of the Study:

To demonstrate complementary characterization techniques for optimizing graphene-based hybrids.
To explore the utility of energy-filtered transmission electron microscopy (EFTEM) for analyzing graphene/metal oxide nanocomposites.

Main Methods:

X-ray diffraction (XRD)
High-resolution electron microscopy (HREM)
Energy-dispersive X-ray spectroscopy (EDX)
Energy-filtered transmission electron microscopy (EFTEM)

Main Results:

EFTEM elemental mapping identified that cobalt NC oxidation in graphene/CoO(x) occurred during post-treatment.
2D elemental mapping with EFTEM differentiated the distribution of Mn, Co, and Ni on graphene surfaces in graphene/(Mn, Co, Ni)O(x).

Conclusions:

EFTEM provides critical information for evaluating the structure and performance of graphene-based hybrids.
Optimized synthesis and characterization of graphene NC hybrids are essential for advancing green energy applications.