H2气体控制的WO3单晶微谐振器的大应变调谐
Large tunability of strain in WO3 single-crystal microresonators controlled by exposure to H2 gas
摘要：
应变工程是操纵材料物理状态、控制其电子特性并实现关键功能的最有效方法之一。由于它们丰富的相图产生于竞争的基态，量子材料是按需材料控制的理想场所，并可用于开发新兴技术，如自适应电子学或神经形态计算。最近有人提出，复合氧化物可以为纳米力学领域带来前所未有的功能，但迄今为止还缺乏精确控制材料应力状态的可能性。在这里，我们证明了广泛的和可逆的操纵应力状态的单晶WO3的应变工程控制的催化氢化。氢在独立超薄结构中的逐渐掺入决定了它们的机械共振频率的大的变化并引起静态变形。我们的研究结果表明，氢掺杂作为一种新的范例，可逆地操纵基于材料控制的纳米器件的机械性能。
英文摘要：
Strain engineering is one of the most effective approaches to manipulate the physical state of materials, control their electronic properties, and enable crucial functionalities. Because of their rich phase diagrams arising from competing ground states, quantum materials are an ideal playground for on-demand material control, and can be used to develop emergent technologies, such as adaptive electronics or neuromorphic computing. It was recently suggested that complex oxides could bring unprecedented functionalities to the field of nanomechanics, but the possibility of precisely controlling the stress state of materials is so far lacking. Here we demonstrate the wide and reversible manipulation of the stress state of single-crystal WO3 by strain engineering controlled by catalytic hydrogenation. Progressive incorporation of hydrogen in freestanding ultra-thin structures determines large variations of their mechanical resonance frequencies and induces static deformation. Our results demonstrate hydrogen doping as a new paradigm to reversibly manipulate the mechanical properties of nanodevices based on materials control.
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