多层还原氧化石墨烯纳米球热载流子发光的增强
Enhanced Hot-Carrier Luminescence in Multilayer Reduced Graphene Oxide Nanospheres
摘要：
我们报道了一种通过增强载流子散射而不是直接改变多层还原氧化石墨烯（rGO）纳米球中的能带结构来促进石墨烯材料中的光致发光发射的方法。我们有意地卷曲石墨烯层以形成纳米球，通过用球形聚合物模板还原氧化石墨烯来操纵载流子散射。这些纳米球产生热载流子发光，与平面纳米片相比，发射效率提高了十倍以上。随着激发功率的增加，纳米球的热载流子发光表现出异常的光谱红移，其动力学特征与增强的电子-声子耦合有关。这些实验结果可以通过考虑屏蔽库仑相互作用得到很好的理解。随着载流子密度的增加，降低的屏蔽效应促进载流子散射，这增强了来自这种多层rGO纳米球的热载流子发射。这种载波散射的情况下，进一步证实了泵浦探测测量。
英文摘要：
We report a method to promote photoluminescence emission in graphene materials by enhancing carrier scattering instead of directly modifying band structure in multilayer reduced graphene oxide (rGO) nanospheres. We intentionally curl graphene layers to form nanospheres by reducing graphene oxide with spherical polymer templates to manipulate the carrier scattering. These nanospheres produce hot-carrier luminescence with more than ten-fold improvement of emission efficiency as compared to planar nanosheets. With increasing excitation power, hot-carrier luminescence from nanospheres exhibits abnormal spectral redshift with dynamic feature associated to the strengthened electron-phonon coupling. These experimental results can be well understood by considering the screened Coulomb interactions. With increasing carrier density, the reduced screening effect promotes carrier scattering which enhances hot-carrier emission from such multilayer rGO nanospheres. This carrier-scattering scenario is further confirmed by pump-probe measurements.
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