Probing the interaction between 2D materials and oligoglycine tectomers
Probing the interaction between 2D materials and oligoglycine tectomers
复制标题
探究二维材料与低聚甘氨酸结构单元之间的相互作用
DOI：
10.1088/2053-1583/ac92ec
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发表时间：
2022-10-01
期刊：
影响因子：
5.5
通讯作者：
Munoz, Edgar
中科院分区：
文献类型：
--
作者：
Tripathi, Manoj;Garriga, Rosa;Munoz, Edgar
基于石墨烯和MoS_2的二维材料的异质结使关键的基础研究和前所未有的传感性能成为可能。当石墨烯和MoS2与模拟生物分子的2D片层相连时，这些异系统是有趣的，例如氨基端的寡甘氨酸自组装(称为覆盖分子)。在石墨烯和MoS_2上的吸附通过电子电荷迁移和机械应力传递来调节其物理化学性质。在这里，我们用拉曼光谱和结构官能化扫描探针显微镜系统地研究了结构分子/石墨烯和结构分子/MoS_2杂化结构中的机械应变、电荷转移和结合亲和力。拉曼图谱显示，在单层MoS2上有p掺杂，在多层MoS2上有n掺杂，表现出不同的厚度依赖关系。相反，正如x射线光电子能谱所证实的那样，石墨烯是由tetomer掺杂的，与层数无关。用结构功能化的探针显微镜进一步研究了氨基与2D材料之间的界面结合。这表明，这些探针具有潜在的2D材料的化学敏感成像，这将有助于绘制表面的化学不同区域和层数。这里描述的简便的熔覆方法是原子力显微镜探针高密度胺功能化的一种有吸引力的软化学策略，因此为传感器应用开辟了有前途的途径。
Heterostructures of two-dimensional (2D) materials using graphene and MoS2 have enabled both pivotal fundamental studies and unprecedented sensing properties. These heterosystems are intriguing when graphene and MoS2 are interfaced with 2D sheets that emulate biomolecules, such as amino-terminated oligoglycine self-assemblies (known as tectomers). The adsorption of tectomer sheets over graphene and MoS2 modulates the physicochemical properties through electronic charge migration and mechanical stress transfer. Here, we present a systematic study by Raman spectroscopy and tectomer-functionalised scanning probe microscopy to understand mechanical strain, charge transfer and binding affinity in tectomer/graphene and tectomer/MoS2 hybrid structures. Raman mapping reveals distinctive thickness dependence of tectomer-induced charge transfer to MoS2, showing p-doping on monolayer MoS2 and n-doping on multilayer MoS2. By contrast, graphene is n-doped by tectomer independently of layer number, as confirmed by x-ray photoelectron spectroscopy. The interfacial adhesion between the amino groups and 2D materials are further explored using tectomer-functionalised probe microscopy. It is demonstrated here that these probes have potential for chemically sensitive imaging of 2D materials, which will be useful for mapping chemically distinct domains of surfaces and the number of layers. The facile tectomer-coating approach described here is an attractive soft-chemistry strategy for high-density amine-functionalisation of atomic force microscopy probes, therefore opening promising avenues for sensor applications.