全碳垂直范德华异质结构：用于电子应用的石墨烯的非破坏性功能化
All-carbon vertical van der Waals heterostructures: Non-destructive functionalization of graphene for electronic applications
摘要：
我们提出了一种通过组装垂直全碳范德华异质结构实现石墨烯非破坏性功能化的途径。为此，我们采用单层石墨烯（SLG）片生长的低压甲烷CVD铜箔和大面积介电~1 nm厚的氨基封端的碳纳米膜（NH 2-CNMs）产生的电子束诱导交联的芳香族自组装单层。我们封装SLG片氧化硅晶片与NH 2-CNMs通过机械堆叠和表征所形成的异质结构的结构，化学和电子性质的拉曼光谱和X射线光电子能谱学，以及通过电气和电磁输运测量。我们表明，功能氨基带来的SLG片附近，他们的运输特性不受损害，这种功能化;此外，我们证明了异质结构设备的功能响应的质子化的氨基在水中。由于其相对简单，所提出的方法为在其中需要石墨烯的非破坏性化学官能化（例如，用于化学和生物传感的工程电换能器）或作为分层异质结构中石墨烯的互补电介质。
英文摘要：
We present a route to non-destructive functionalization of graphene via assembly of vertical all-carbon van der Waals heterostructures. To this end, we employ singlelayer graphene (SLG) sheets grown by low-pressure methane CVD on Cu foils and large-area dielectric ~1 nm thick amino-terminated carbon nanomembranes (NH2-CNMs) generated by electron-beam-induced crosslinking of aromatic self-assembled monolayers. We encapsulate SLG sheets on oxidized silicon wafers with NH2-CNMs via mechanical stacking and characterize structural, chemical and electronic properties of the formed heterostructures by Raman spectroscopy and X-ray photoelectron spectroscopy as well as by electric and electromagnetic transport measurements. We show that functional amino groups are brought in close vicinity of the SLG sheets and that their transport characteristics are not impaired by this functionalization; moreover, we demonstrate a functional response of the heterostructure devices to the protonation of the amino groups in water. Due to its relative simplicity, the suggested approach opens broad avenues for implementations in graphene-based electronic devices where non-destructive chemical functionalization of graphene is required (e.g., for engineering electrical transducers for chemical and bio-sensing) or as complementary dielectric to graphene in hieratical heterostructures.
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