Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

GaN nanowire coated with atomic layer deposition of tungsten: a probe for near-field scanning microwave microscopy



Joel C. Weber, Paul T. Blanchard, Aric W. Sanders, Jonas Gertsch, Steven George, Samuel Berweger, Atif A. Imtiaz, Thomas M. Wallis, Kristine A. Bertness, Pavel Kabos, Norman A. Sanford, victor bright


We report on the fabrication of a GaN nanowire probe for near-field scanning microwave microscopy. The probe has a capacitive resolution of ~0.03 fF, surpassing that of a commercial Pt tip. Imaging of MoS2 sheets found the probe to be immune to surface contamination, owing to its flexible, high- aspect ratio morphology. By improving microwave and topographical sensitivity in a mechanically robust architecture, this probe serves as an ideal platform for additional, complimentary scanning probe techniques.
Nano Letters


Scanning microwave microscopy, gallium nitride, nanowires, atomic layer deposition, molybdenum disulphide
Created September 26, 2014, Updated November 10, 2018