Abstract
Nanopore structure presents great application potential especially in the area of biosensing. The two-dimensional (2D) vdW heterostructure nanopore shows unique features, while research around its fabrication is very limited. This paper proposes for the first time the use of ion beam irradiation for creating nanopore structure in 2D vdW graphene-MoS2 heterostructures. The formation process of the heterostructure nanopore is discussed first. Then, the influence of ion irradiation parameters (ion energy and ion dose) is illustrated, based on which the optimal irradiation parameters are derived. In particular, the effect of stacking order of the heterostructure 2D layers on the induced phenomena and optimal parameters are taken into consideration. Finally, uniaxial tensile tests are conducted by taking the effect of irradiation parameters, nanopore size and stacking order into account to demonstrate the mechanical performance of the heterostructure for use under a loading condition. The results would be meaningful for expanding the applications of heterostructure nanopore structure, and can arouse more research interest in this area.
Highlights
The two-dimensional (2D) vdW heterostructure nanopore shows unique features, while research around its fabrication is very limited
The nanopores in 2D vdW heterostructures, which are synthesized by vertically stacking two different 2D crystals [25], were demonstrated to be able to drive the penetration of biomolecules by the difference in binding affinities for each 2D surface, rather than the external electrical field [26,27,28]
Processparticle of Nanopore crystals, which may lead to four phenomena, i.e., reflection, absorption, embedment, or During ion irradiation, the irradiated particle would interact with atoms in the 2D
Summary
Nanopore technology refers to the creation and applications of nanometer pores in membrane structures. Some applications such as biosensors require that a single pore is created in the membrane For this scenario, the methods of electrical pulses [17], transmission electron microscope sculpting [18], and ion beam irradiation [19] are more suitable. For applications of 2D nanopores in biosensing, a large electric field is often applied to drive the biomolecules through the nanopore, which results in rapid penetration, limiting the resolution of detection. This method only works for biomolecules with net charges. The mechanical behavior of the heterostructure and nanopore under tensile strain is investigated for actual applications
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