Diverse ultrafast dynamics have been reported on different graphene prepared by different methods. Chemical-vapor-deposited (CVD) growth is regarded as a very promising method for highly efficient production of graphene. However, CVD-grown graphene usually presents only one of the diverse ultrafast dynamics. Thus, control of the ultrafast photo-electronic dynamics of CVD-grown graphene is vital to present diversity for different photodetection applications of CVD-grown graphene. In this paper, we report on the first realization to our knowledge of control of the ultrafast dynamics of CVD-grown graphene and the manifestation of diverse ultrafast dynamics on sole CVD-grown graphene. We study the ultrafast photoelectronic dynamics of CVD-grown graphene with different degrees of oxidation caused by ozone oxidation using femtosecond time-resolved transient differential transmission spectroscopy, and we find that the ultrafast dynamics can evolve obviously with the time of ozone oxidation. The diverse ultrafast dynamics reported previously on different monolayer graphenes prepared by different methods are achieved on the sole CVD-grown graphene by controlling oxidation time. The mechanism for manipulation of the ultrafast dynamics by ozone oxidation is revealed by Raman spectroscopy as the control of the Fermi level of CVD-grown graphene. Simulations of dynamics based on the optical conductivity model of graphene and Fermi level change well reproduce the observed diverse ultrafast dynamics. Our results are very important for the diverse applications of graphene and open a new path toward the diverse ultrafast dynamics on sole graphene prepared by any method.

中文翻译：

---

通过臭氧氧化控制化学气相沉积生长石墨烯的超快光电动力学

已经报道了通过不同方法制备的不同石墨烯的不同超快动力学。化学气相沉积 (CVD) 生长被认为是一种非常有前途的高效生产石墨烯的方法。然而，CVD 生长的石墨烯通常仅呈现多种超快动力学中的一种。因此，控制 CVD 生长石墨烯的超快光电动力学对于呈现 CVD 生长石墨烯的不同光电检测应用的多样性至关重要。在本文中，我们报告了我们对 CVD 生长石墨烯超快动力学控制的第一次认识，以及单一 CVD 生长石墨烯上各种超快动力学的表现。我们使用飞秒时间分辨瞬态差分透射光谱研究了由臭氧氧化引起的不同氧化程度的 CVD 生长石墨烯的超快光电动力学，我们发现超快动力学可以随着臭氧氧化的时间发生明显变化。通过控制氧化时间，在单一 CVD 生长的石墨烯上实现了先前报道的由不同方法制备的不同单层石墨烯的各种超快动力学。拉曼光谱揭示了通过臭氧氧化操纵超快动力学的机制作为 CVD 生长石墨烯的费米能级的控制。基于石墨烯和费米能级变化的光导率模型的动力学模拟很好地再现了观察到的各种超快动力学。