Weapon of Mass Integration (WMI)

High-throughput semi-automated image analysis program for quantitative STEM

Weapon of Mass Integration (WMI) is a MATLAB®-based program for the rapid measurement of size and integrated intensity of supported nanoparticles for quantitative STEM. When applied to properly calibrated HAADF-STEM micrographs, this information can then be used to calculate the elastic electron scattering cross-section of each nanoparticle and thus the number of atoms inside it. The program optimizes the analysis parameters, applying the procedure consistently across the entire dataset, enhancing the meaningfulness of the statistics as well as the reproducibility and transferability of the results. This ability to rapidly analyze statistically robust populations of nanoparticles allows for more representative characterization of batch uniformity/dispersion and is an excellent complement to single-particle atomic-resolution imaging.

WMI is free for academic/non-commercial use. (For commercial use, contact me.) If you do use it for published work, please include a citation to the following article:

S.D. House, Y. Chen, R. Jin, J.C. Yang, High-throughput, Semi-automated Quantitative STEM Mass Measurement of Supported Metal Nanoparticles Using a Conventional TEM/STEM, Ultramicroscopy, 182 (2017) 145-155.

https://doi.org/10.1016/j.ultramic.2017.07.004

Current Version: 1.0

Full changelog [HERE].

A user guide can be found [HERE]. Like the software itself, it will see continuous improvement. A detailed discussion of the software and analysis technique it was written for are described in the following paper: https://doi.org/10.1016/j.ultramic.2017.07.004

I greatly welcome any bugs reports, as well as any suggested improvements. WMI is a continuous work-in-progress, with a whole list of new and improved features in the pipeline.

Download the current version at the WMI GitLab repository: https://gitlab.com/shouse/WMI