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   Jakob, Devon S.; Wang, Haomin; Xu, Xiaoji G. (April 2020, ACS Nano)

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2. Peak Force Infrared–Kelvin Probe Force Microscopy

   https://doi.org/10.1002/anie.202004211  

   Jakob, Devon S.; Wang, Haomin; Zeng, Guanghong; Otzen, Daniel E.; Yan, Yong; Xu, Xiaoji G. (June 2020, Angewandte Chemie International Edition)

   Abstract Correlative scanning probe microscopy of chemical identity, surface potential, and mechanical properties provide insight into the structure–function relationships of nanomaterials. However, simultaneous measurement with comparable and high resolution is a challenge. We seamlessly integrated nanoscale photothermal infrared imaging with Coulomb force detection to form peak force infrared–Kelvin probe force microscopy (PFIR‐KPFM), which enables simultaneous nanomapping of infrared absorption, surface potential, and mechanical properties with approximately 10 nm spatial resolution in a single‐pass scan. MAPbBr₃perovskite crystals of different degradation pathways were studied in situ. Nanoscale charge accumulations were observed in MAPbBr₃near the boundary to PbBr₂. PFIR‐KPFM also revealed correlations between residual charges and secondary conformation in amyloid fibrils. PFIR‐KPFM is applicable to other heterogeneous materials at the nanoscale for correlative multimodal characterizations. 

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3. High-Force Application by a Nanoscale DNA Force Spectrometer

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4. Pulsed Force Kelvin Probe Force Microscopy─A New Type of Kelvin Probe Force Microscopy under Ambient Conditions

   https://doi.org/10.1021/acs.jpcc.4c01461  

   Zahmatkeshsaredorahi, Amirhossein; Jakob, Devon_S; Xu, Xiaoji_G (June 2024, The Journal of Physical Chemistry C)
5. Spin self-force

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   Mackewicz, Kristian; Wald, Robert M. (November 2019, Physical Review D)