Because of their unusual fundamental behavior that arises at the molecular scale, the electrical conductivity of stacked graphene oxide (GO) sheets in the presence of external parameters is not adequately understood. Previous studies concentrated on the DC response of thin GO membranes giving their resistive switching properties. Here, we observe anomalous low-frequency (<1 Hz) oscillations in the electrical conductivity of micrometer size GO, which is repeated in a process over and over in an ongoing feedback loop. Such vibrations and their unique trajectories are not only fundamentally important but also have characteristic frequencies that can be directly linked to the formation and destruction of regions with sp² hybridization. Also, the reported switching time (of the order of seconds) makes our resistive switching system different than all the previously reported systems and introduces a new class of switching phenomena. The observed phenomena improve our understanding of the electrical conductivity of GO membranes and the corresponding microscopic details that pave the way for the promising application of these new observed low-frequency oscillations.

中文翻译：

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厚氧化石墨烯膜电导率的振荡

由于它们在分子尺度上出现的不寻常的基本行为，在存在外部参数的情况下堆叠氧化石墨烯 (GO) 片的电导率尚未得到充分理解。以前的研究集中在薄 GO 膜的直流响应上，使其具有电阻开关特性。在这里，我们观察到微米尺寸 GO 电导率的异常低频 (<1 Hz) 振荡，这种振荡在一个持续的反馈回路中一遍又一遍地重复。这种振动及其独特的轨迹不仅具有根本的重要性，而且还具有与sp ²区域的形成和破坏直接相关的特征频率杂交。此外，报告的开关时间（秒级）使我们的电阻开关系统与之前报告的所有系统不同，并引入了一类新的开关现象。观察到的现象提高了我们对 GO 膜电导率和相应微观细节的理解，为这些新观察到的低频振荡的有前景的应用铺平了道路。