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Graphene-based biosensor using transport properties

机译：利用传输特性的基于石墨烯的生物传感器

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The potential of graphene nanoribbons (GNR's) as molecular-scale sensors is investigated by calculating the electronic properties of the ribbon and the organic molecule ensemble. The organic molecule is assumed to be absorbed at the edge of a zigzag GNR. These nanostructures are described using a single-band tight-binding Hamiltonian. Their transport spectrum and density of states are calculated using the nonequilibrium Green's function formalism. The results show a significant suppression of the density of states (DOS), with a distinct response for the molecule. This may be promising for the prospect of GNR-based single-molecule sensors that might depend on the DOS (e.g., devices that respond to changes in either conductance or electroluminescence). Further, we have investigated the effect of doping on the transport properties of the system. The substitutional boron and nitrogen atoms are located at the center and edge of GNR's. These dopant elements have significant influence on the transport characteristics of the system, particularly doping at the GNR edge.
机译：通过计算碳带和有机分子的电子性质，研究了石墨烯纳米带（GNR）作为分子尺度传感器的潜力。假定有机分子被吸收在锯齿形GNR的边缘。使用单带紧密结合的哈密顿量描述了这些纳米结构。使用非平衡格林函数形式主义计算它们的传输谱和状态密度。结果显示了对状态密度（DOS）的显着抑制，并对分子具有明显的响应。对于可能依赖于DOS的基于GNR的单分子传感器（例如，对电导或电致发光的变化做出响应的设备）的前景，这可能是有希望的。此外，我们已经研究了掺杂对系统传输性能的影响。硼和氮取代原子位于GNR的中心和边缘。这些掺杂元素对系统的传输特性有重要影响，特别是在GNR边缘掺杂。

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