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The change in the twist angle causes the maximum and minimum currents of the device able to increase or decrease in the value of these changes through creating defect and doping in the structure which, also, relies on the defect or doping and their position. Having applied the twist, the bond length structure of the atoms, the charge density distribution, and transmission pathways vary leading to the different strain energies and change in the electronic behavior of the device. The combination of density function theory (DFT) and the non-equilibrium Green's function methods were utilized in the computation. The results show that among the above models, eight devices with suitable switching behavior can be selected as the first graphene-based nanoribbon rotational switch (GRS) with defect and doping. In general, 105 models were produced with this specification. Five different twist angles were investigated for the perfect model, N doping and single vacancy defect which are located in three different positions and in three different widths of AGNR. 88, 142102 (2006).The effect of nitrogen (N) doping and single vacancy defect is investigated on the electromechanical properties of twisted armchair graphene nanoribbon (TAGNR). Analysis of graphene nanoribbons as a channel material for field-effect transistors. Modulated chemical doping of individual carbon nanotubes. Electromechanical resonators from graphene sheets. Submicron sensors of local electric field with single-electron resolution at room temperature. Controlling the electronic structure of bilayer graphene. Ohta, T., Bostwick, A., Seyller, T., Horn, K. Electronic confinement and coherence in patterned epitaxial graphene. Detection limits for nanoscale biosensors. The structure of suspended graphene sheets. Strong suppression of weak localization in graphene. Carrier transport in two-dimensional graphene layers. Screening effect and impurity scattering in monolayer graphene. Experimental observation of the quantum Hall effect and Berry’s phase in graphene. Two dimensional gas of massless Dirac fermions in graphene. Low-frequency fluctuations in solids: 1/f noise. Extreme oxygen sensitivity of electronic properties of carbon nanotubes. Nanotube molecular wires as chemical sensors. Solid state gas sensors: State of the art and future activities. The achieved sensitivity is due to the fact that graphene is an exceptionally low-noise material electronically, which makes it a promising candidate not only for chemical detectors but also for other applications where local probes sensitive to external charge, magnetic field or mechanical strain are required. The adsorbed molecules change the local carrier concentration in graphene one by one electron, which leads to step-like changes in resistance. Here, we show that micrometre-size sensors made from graphene are capable of detecting individual events when a gas molecule attaches to or detaches from graphene’s surface. The fundamental reason limiting the resolution of such sensors is fluctuations due to thermal motion of charges and defects 5, which lead to intrinsic noise exceeding the sought-after signal from individual molecules, usually by many orders of magnitude. Such resolution has so far been beyond the reach of any detection technique, including solid-state gas sensors hailed for their exceptional sensitivity 1, 2, 3, 4. In the case of chemical sensors, the quantum is one atom or molecule. The ultimate aim of any detection method is to achieve such a level of sensitivity that individual quanta of a measured entity can be resolved.