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Extreme Measurement and Nanoscience Lab
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The lab uses atomic force microscopy to explore nanoscale phenomena on solid surfaces and the mechanisms of catalysis.
AboutAbout the lab
Exploring the new nanoscale world together.
The Extreme Measurement and Nanoscience Lab (Yanjun Li Lab) uses scanning probe microscopes such as atomic force microscopes to study new physical phenomena that occur at solid surfaces and at solid-liquid interfaces.
One of its goals is to clarify how catalysts work.
The targets are palladium nanoparticles on an Al2O3/NiAl(110) surface in carbon monoxide gas, and gold nanoparticles on a rutile TiO2(110) surface at low temperature in gas.
On the lab's website, it is presented under names such as "Yanjun Li Lab" and "Li Lab, Extreme Measurement and Nanoscience Area."
Key terms
- Atomic force microscopy
- A microscopy technique that measures the force acting between a probe tip and a sample surface to examine the surface at the atomic scale
- Kelvin probe force microscopy
- A microscopy method that examines the distribution of potential (contact potential difference) on a sample surface at the atomic scale
- Contact potential difference
- The difference in potential between a probe tip and a sample surface. It represents how the potential varies from place to place on the surface
- Catalyst
- A substance that promotes chemical reactions. One example is the three-way catalyst that cleans automobile exhaust
NewsLab news
Mechanocatalytic reaction on a titanium oxide surface achieved with atomic force microscopy
CO oxidation by gold atoms on titanium oxide successfully carried out with atomic force microscopy
ResearchResearch themes
While developing new nanoscale measurement techniques based on non-contact atomic force microscopy, the lab searches for new physical phenomena that occur on solid surfaces. It is also working on technologies for the future that manipulate individual atoms and molecules to assemble new nanomaterials and nanodevices.
*Illustrative imageMeasuring titanium oxide surfaces with atomic resolution
Using an atomic force microscope operating at 78 K and Kelvin probe force microscopy, the lab examines the (110) surface of titanium oxide (TiO2) with atomic resolution. In tunneling current images, surface oxygen atoms that have rarely been observed become visible, and subsurface defects appear more clearly than in topographic images.
*Illustrative imagePotential distribution on titanium oxide surfaces
The lab uses Kelvin probe force microscopy to examine the potential distribution on the (110) surface of titanium oxide (TiO2). It has shown that the contact potential difference is larger at twofold-coordinated oxygen atoms and smaller at OH defects and fivefold-coordinated titanium atoms, and it proposes a model that explains how this arises.
*Illustrative imageDistinguishing atoms on an alumina thin-film surface
The lab examines the ultrathin alumina film formed on NiAl(110) using non-contact atomic force microscopy under ultrahigh vacuum at room temperature. It obtained images in which all the aluminum atoms with different coordination can be distinguished, and, together with theoretical calculations, explains how the images arise.
MembersFaculty
The members of the Extreme Measurement and Nanoscience Lab consist of faculty members and PhD, master's, and undergraduate students.As of 2026
- Associate ProfessorYanjun Li
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Surface plexiglas sable AFM 3D” Léonito 2003 / CC BY 4.0 (cropped)
- Measuring titanium oxide surfaces with atomic resolution: “Xenotime with Rutile-08-2-78ab” Robert M. Lavinsky / CC BY-SA 3.0 (cropped)
- Potential distribution on titanium oxide surfaces: “Atomic force microscope by Zureks” Zureks / CC BY-SA 3.0 (cropped)
- Distinguishing atoms on an alumina thin-film surface: “Atomic resolution Au100” Erwinrossen / Public domain (cropped)
- Related lab (応用物理化学領域): “Photovoltaic panel at the National Solar Energy Center in Israel” David Shankbone / CC BY 3.0 (cropped)
- Related lab (ナノ表面界面工学領域): “Scanning tunneling microscope-MHS 2237-IMG 3817-white” Rama / CC BY-SA 3.0 fr (cropped)
- Related lab (計算物理領域): “Xanthoconite crystal structure (Engel-Nowacki 1968) polyhedra model free axis” Ra'ike (Wikipedia) / CC0 (cropped)
- Related lab (錯体化学領域): “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
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