Ben-Shimon Yahav, Bhingardive Viraj, Joselevich Ernesto, Ya'akobovitz Assaf
Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel.
Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel.
Nano Lett. 2022 Oct 12;22(19):8025-8031. doi: 10.1021/acs.nanolett.2c01422. Epub 2022 Sep 12.
We demonstrate self-sensing tungsten disulfide nanotube (WS NT) 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 WS NT 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 WS NTs, which we used for modeling the behavior of the WS NT 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 WS and emphasize their potential to operate as key components in functional devices, such as nanosensors and radio frequency devices.
我们展示了自感知二硫化钨纳米管（WS NT）扭转谐振器。这些谐振器通过静电激励和压阻式运动检测实现全电自感知操作。我们表明，WS NT谐振器的扭转运动会导致纳米管电阻发生变化，在其机械共振附近变化最为显著，此时扭转振动的幅度最大。原子力显微镜分析揭示了WS NT的扭转和弯曲刚度，我们用其对WS NT器件的行为进行建模。此外，静电边值问题的解表明了器件周围的空间电势和静电场线如何影响其电容。这些结果揭示了WS的电学和力学行为之间的耦合，并强调了它们作为功能器件（如纳米传感器和射频器件）关键组件的运行潜力。
