Current annealing behaviors that directly contribute to excellent electrical transport properties in suspended graphene devices are investigated. All successful annealing data for various thicknesses of graphene exhibit three different stages in current–voltage curves upon bias voltage application: (1) sublinear increase in current, (2) abrupt current decrease, and (3) current saturation. This can be attributed to the phonon effect and the structural deformation of graphene at high temperatures induced by Joule heating. It is observed that cleaning occurred primarily in the last stage when the current becomes saturated.

中文翻译：

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悬浮石墨烯中的电流退火行为

研究了直接有助于悬浮石墨烯器件中优异电传输特性的当前退火行为。不同厚度石墨烯的所有成功退火数据在施加偏置电压时在电流 - 电压曲线中表现出三个不同阶段：（1）电流的亚线性增加，（2）电流突然下降，以及（3）电流饱和。这可以归因于声子效应和由焦耳加热引起的高温下石墨烯的结构变形。据观察，清洗主要发生在电流饱和的最后阶段。