Protection of Molecular Microcrystals by Encapsulation under Single-Layer Graphene
Protection of Molecular Microcrystals by Encapsulation under Single-Layer Graphene
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DOI：
10.1021/acsomega.8b00872
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发表时间：
2018-07-01
期刊：
影响因子：
4.1
通讯作者：
Bardeen, Christopher J.
中科院分区：
文献类型：
--
作者：
Li, Wangxiang;Tierce, Nathan T.;Bardeen, Christopher J.
在温和的条件下，由共轭有机分子perene组成的微晶体可以被包裹在单层石墨烯下。扫描电子和原子力显微镜图像显示，石墨烯以保形涂层的形式存在于晶体的顶部。拉曼光谱表明，石墨烯只受到底层晶体的轻微扰动，可能是由于应变。石墨烯层提供完全的保护，不受各种溶剂的影响，并防止晶体在高温下升华。时间分辨的光致发光测量没有检测到石墨烯层对perene发射的任何猝灭，尽管不能排除晶体-石墨烯界面几纳米范围内的非辐射能量转移。在石墨烯单层下将样品封装在衬底上的能力可以提供一种在环境条件下访问有机晶体并与其相互作用的新方法。
Microcrystals composed of the conjugated organic molecule perylene can be encapsulated beneath single-layer graphene using mild conditions. Scanning electron and atomic force microscopy images show that the graphene exists as a conformal coating on top of the crystal. Raman spectroscopy indicates that the graphene is only slightly perturbed by the underlying crystal, probably due to strain. The graphene layer provides complete protection from a variety of solvents and prevents sublimation of the crystal at elevated temperatures. Time-resolved photoluminescence measurements do not detect any quenching of the perylene emission by the graphene layer, although nonradiative energy transfer within a few nanometers of the crystal-graphene interface cannot be ruled out. The ability to encapsulate samples on a substrate under a graphene monolayer may provide a new way to access and interact with the organic crystal under ambient conditions.