School of Mechanical Engineering, Konkuk University, Seoul, Republic of Korea.
Nanotechnology. 2011 Jul 1;22(26):265502. doi: 10.1088/0957-4484/22/26/265502. Epub 2011 May 17.
Nanomechanical resonators have recently been highlighted because of their remarkable ability to perform both sensing and detection. Since the nanomechanical resonators are characterized by a large surface-to-volume ratio, it is implied that the surface effect plays a substantial role on not only the resonance but also the sensing performance of nanomechanical resonators. In this work, we have studied the role of surface effect on the detection sensitivity of a nanoresonator that undergoes either harmonic vibration or nonlinear oscillation based on the continuum elastic model such as an elastic beam model. It is shown that the surface effect makes an impact on both harmonic resonance and nonlinear oscillations, and that the sensing performance is dependent on the surface effect. Moreover, we have also investigated the surface effect on the mechanical tuning of resonance and sensing performance. It is interestingly found that the mechanical tuning of resonance is independent of the surface effect, while the mechanical tuning of sensing performance is determined by the surface effect. Our study sheds light on the importance of the surface effect on the sensing performance of nanoresonators.
纳米机械谐振器由于其出色的传感和检测能力而备受关注。由于纳米机械谐振器具有大的表面积与体积比，这意味着表面效应对不仅对谐振，而且对纳米机械谐振器的传感性能都起着重要作用。在这项工作中，我们基于弹性梁模型等连续体弹性模型，研究了表面效应对经历谐波振动或非线性振荡的纳米谐振器检测灵敏度的作用。结果表明，表面效应对谐波共振和非线性振荡都有影响，传感性能取决于表面效应。此外，我们还研究了表面效应对谐振和传感性能的机械调谐的影响。有趣的是，发现谐振的机械调谐与表面效应无关，而传感性能的机械调谐则由表面效应决定。我们的研究揭示了表面效应对纳米谐振器传感性能的重要性。
