Real-time nanomechanical property modulation as a framework for tunable NEMS.
Real-time nanomechanical property modulation as a framework for tunable NEMS.
复制标题
实时纳米力学性能调制作为可调谐纳米机械系统的框架。
DOI：
10.1038/s41467-022-29117-7
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发表时间：
2022-03-18
影响因子：
16.6
通讯作者：
Bhaskaran H
中科院分区：
文献类型：
--
作者：
Ali UE;Modi G;Agarwal R;Bhaskaran H
相变材料（PCM）可以在非晶态和晶态之间永久而可逆地切换。然而，其机械性能的变化在很大程度上尚未得到利用。使用悬浮薄膜的最实用的配置遭受到双折射和熔化淬火。在这里，我们克服了这些限制，使用纳米线作为有源纳米机电系统（NEMS）。我们实现主动调制的GeTe纳米线的杨氏模量，通过利用一个独特的位错为基础的路线非晶化。这些纳米线NEMS能够在30%的范围内实现谐振频率的无功耗调谐。此外，它们的高品质因子（> 104）在相变后被保留。我们利用其固有的压阻性与前所未有的应变系数（高达1100），以促进单片集成。我们的NEMS演示实时频率调谐在跳频扩频无线电原型。这项工作不仅开辟了一个全新的领域，相变NEMS，但也提供了一个新的框架，利用功能纳米线的主动机械系统。以前还没有实现直接调制杨氏模量以实时影响机械共振。在这里，作者利用GeTe纳米线中的位错迁移现象来开发纳米机电系统，该系统具有30%范围内的机械共振的无功率调谐，高且稳定的质量和计量因子。
Phase-change materials (PCMs) can switch between amorphous and crystalline states permanently yet reversibly. However, the change in their mechanical properties has largely gone unexploited. The most practical configuration using suspended thin-films suffer from filamentation and melt-quenching. Here, we overcome these limitations using nanowires as active nanoelectromechanical systems (NEMS). We achieve active modulation of the Young’s modulus in GeTe nanowires by exploiting a unique dislocation-based route for amorphization. These nanowire NEMS enable power-free tuning of the resonance frequency over a range of 30%. Furthermore, their high quality factors ( > 104) are retained after phase transformation. We utilize their intrinsic piezoresistivity with unprecedented gauge factors (up to 1100) to facilitate monolithic integration. Our NEMS demonstrate real-time frequency tuning in a frequency-hopping spread spectrum radio prototype. This work not only opens up an entirely new area of phase-change NEMS but also provides a novel framework for utilizing functional nanowires in active mechanical systems. Direct modulation of Young‟s Modulus to affect mechanical resonances in real-time has not been achieved before. Here, the authors leverage the dislocation migration phenomenon in GeTe nanowires to develop nanoelectromechanical systems with powerfree tuning of mechanical resonances within a range of 30%, high and stable quality and gauge factors.
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影响因子：
10.8
作者：
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通讯作者：
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