New Publication in Analytical Chemistry

Check out our newest publication: https://doi.org/10.1021/acs.analchem.5c04707 (open access).

This research was led by Yide Zhang, and recently published in ACS Analytical Chemistry and combines multiple fields of expertise.

This paper introduces a detailed study on how AFM-IR can be used to image subsurface features in organic multilayer structures. The work shows that image broadening strongly depends on whether the infrared excitation occurs in the top layer or beneath it, and that the lateral size of the absorber plays a key role in signal strength and spatial resolution. These findings are backed by experiments and finite element simulations, showing excellent agreement. The study also explains how irregular sample geometries influence photothermal expansion, providing a clear origin for distinct imaging artifacts. Overall, the results advance the understanding of AFM-IR signals and point the way toward more reliable and higher-resolution nanoscale chemical imaging.

Special thanks also to our co-authors, and the supervisors Ass. Prof. Dr. Georg Ramer, Prof. Dr. Bernhard Lendl, and Dr. Liam O’Faolain for enabling the collaborative environment between TU Wien (Austria) and Munster Technological University (Ireland).