论文标题
通过原位钾暴露在几层石墨烯中调整电导率和自旋动力学
Tuning Conductivity and Spin Dynamics in Few-Layer Graphene via In Situ Potassium Exposure
论文作者
论文摘要
对于探索性材料科学以及在物理和化学领域的应用，化学修饰，例如新颖材料的插入或掺杂非常重要。在目前的工作中，我们报告了化学去角质的几层石墨烯与钾的系统插入，同时使用微波电导率监测样品抗性。我们发现，在暴露钾时，样品的电导率增加了大约数量级。从ESR强度推导的电荷载体数量增加也反映了这一增量。掺杂的相位在ESR中表现出两条不对称的dysonian线，这是移动电荷载体存在的常见迹象。较宽的组件的宽度随掺杂步骤而增加，但是，狭窄的组件似乎具有恒定的线宽度。
Chemical modification, such as intercalation or doping of novel materials is of great importance for exploratory material science and applications in various fields of physics and chemistry. In the present work, we report the systematic intercalation of chemically exfoliated few-layer graphene with potassium while monitoring the sample resistance using microwave conductivity. We find that the conductivity of the samples increases by about an order of magnitude upon potassium exposure. The increased of number of charge carriers deduced from the ESR intensity also reflects this increment. The doped phases exhibit two asymmetric Dysonian lines in ESR, a usual sign of the presence of mobile charge carriers. The width of the broader component increases with the doping steps, however, the narrow components seem to have a constant line width.
