Abstract
We demonstrate self-sensing tungsten disulfide nanotube (WS2NT) torsional resonators. These resonators exhibit all-electrical self-sensing operation with electrostatic excitation and piezoresistive motion detection. We show that the torsional motion of the WS2NT resonators results in a change of the nanotube electrical resistance, with the most significant change around their mechanical resonance, where the amplitude of torsional vibrations is maximal. Atomic force microscopy analysis revealed the torsional and bending stiffness of the WS2NTs, which we used for modeling the behavior of the WS2NT devices. In addition, the solution of the electrostatic boundary value problem shows how the spatial potential and electrostatic field lines around the device impact its capacitance. The results uncover the coupling between the electrical and mechanical behaviors of WS2and emphasize their potential to operate as key components in functional devices, such as nanosensors and radio frequency devices.
| Original language | English |
|---|---|
| Pages (from-to) | 8025-8031 |
| Number of pages | 7 |
| Journal | Nano Letters |
| Volume | 22 |
| Issue number | 19 |
| Early online date | 12 Sept 2022 |
| DOIs | |
| Publication status | Published - 12 Oct 2022 |
Funding
The authors acknowledge the Israeli Ministry of Science and Technology (MOST) for supporting this study (grant no. 89525). The authors also thank Dan Yudelevich for his advice on the fabrication process, Alla Zak for kindly providing the WS NTs synthesized in her laboratory, Juergen Jopp for his assistance with the AFM measurements, and Shai Sharabi for building the LabView interface. 2
All Science Journal Classification (ASJC) codes
- Bioengineering
- General Chemistry
- General Materials Science
- Condensed Matter Physics
- Mechanical Engineering