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Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles
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X-ray mapping of nanoparticle superlattice thin films
Benjamin T Diroll1, Vicky V T Doan-Nguyen, Matteo Cargnello
1Department of Chemistry, ‡Department of Materials Science and Engineering, and §Department of Electrical and Systems Engineering, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.
ACS Nano
|December 6, 2014
Summary
Researchers developed a large-area characterization method for nanoparticle superlattices using X-ray diffraction. This technique statistically determines grain size and distribution, complementing electron microscopy for ordered nanoparticle films.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Nanoparticle films with long-range order are crucial for advanced materials.
- Characterizing the microstructure of these films over large areas is challenging.
- Electron microscopy provides high resolution but is limited in area coverage.
Purpose of the Study:
- To develop and validate a large-area characterization technique for ordered nanoparticle films.
- To enable statistical analysis of superlattice grain size and distribution.
- To extend the methodology to binary and nanorod superlattice systems.
Main Methods:
- Combining grazing-incidence and transmission small-angle X-ray diffraction (GISAXS and T-SAXS).
- Utilizing electron microscopy for complementary structural analysis.
- Employing systematic sample mapping with a focused X-ray beam.
Main Results:
- Transmission X-ray diffraction enables statistical determination of superlattice grain size and distribution over large areas.
- The method allows spatial mapping of grain size, orientation, uniformity, and strain.
- Successfully applied to binary nanoparticle and nanorod superlattice films.
Conclusions:
- The developed X-ray diffraction framework provides efficient, large-area characterization of nanoparticle superlattices.
- This approach complements and expands upon traditional electron microscopy techniques.
- Offers a robust method for understanding microstructure in ordered nanomaterials.
