Controllable biaxial strain is delivered to monolayer graphene prepared by chemical vapor deposition via applying an electric field to the underlying piezoelectric [Pb(Mg[sub 1/3]Nb[sub 2/3])O₃]₀.₇-[PbTiO₃]₀.₃ substrate. The effects of tunable strain on the Raman spectra of graphene are investigated in reversible and real-time manners. Such strain can result in a blue shift in 2D band of graphene. The calculations based on the Grüneisen parameter identify the actual biaxial strain to graphene, leading to a continuous 2D band shift, which is detected during the retention of bias voltage. The physical mechanism behind this unique Raman behavior is discussed.
展开▼
机译：通过将电场施加到下面的压电[Pb（Mg [sub 1/3] Nb [sub 2/3]）O₃]₃.₇-[PbTiO₃]₀，将可控制的双轴应变传递到通过化学气相沉积制备的单层石墨烯。 .₃基材。以可逆和实时的方式研究了可调谐应变对石墨烯拉曼光谱的影响。这样的应变可能导致石墨烯的2D带发生蓝移。基于Grüneisen参数的计算确定了石墨烯的实际双轴应变，从而导致了连续的2D带移，这在保持偏置电压期间被检测到。讨论了这种独特的拉曼行为背后的物理机制。
展开▼
