title: Direct and Scalable Deposition of Atomically Thin Low-Noise MoS2 Membranes on Apertures.
abstract: Molybdenum disulfide (MoS2) flakes can grow beyond the edge of an underlying substrate into a planar freestanding crystal. When the substrate edge is in the form of an aperture, reagent-limited nucleation followed by edge growth facilitate direct and selective growth of freestanding MoS2 membranes. We have found conditions under which MoS2 grows preferentially across micrometer-scale prefabricated solid-state apertures in silicon nitride membranes, resulting in sealed membranes that are one to a few atomic layers thick. We have investigated the structure and purity of our membranes by a combination of atomic-resolution transmission electron microscopy, elemental analysis, Raman spectroscopy, photoluminescence spectroscopy, and low-noise ion-current recordings through nanopores fabricated in such membranes. Finally, we demonstrate the utility of fabricated ultrathin nanopores in such membranes for single-stranded DNA translocation detection.
authors.affiliation: †Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States.
authors.forename: Pradeep
authors.initials: P
authors.lastname: Waduge
authors.affiliation: †Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States.
authors.forename: Ismail
authors.initials: I
authors.lastname: Bilgin
authors.affiliation: †Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States.
authors.forename: Joseph
authors.initials: J
authors.lastname: Larkin
authors.affiliation: †Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States.
authors.forename: Robert Y
authors.initials: RY
authors.lastname: Henley
authors.affiliation: ‡The Institute of Optics, University of Rochester, Rochester, New York 14627, United States.
authors.forename: Kenneth
authors.initials: K
authors.lastname: Goodfellow
authors.affiliation: §Center for Nanoscale Systems, Harvard University, Cambridge, Massachusetts 02138, United States.
authors.forename: Adam C
authors.initials: AC
authors.lastname: Graham
authors.affiliation: §Center for Nanoscale Systems, Harvard University, Cambridge, Massachusetts 02138, United States.
authors.forename: David C
authors.initials: DC
authors.lastname: Bell
authors.affiliation: ‡The Institute of Optics, University of Rochester, Rochester, New York 14627, United States.
authors.forename: Nick
authors.initials: N
authors.lastname: Vamivakas
authors.affiliation: †Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States.
authors.forename: Swastik
authors.initials: S
authors.lastname: Kar
authors.affiliation: †Department of Physics, Northeastern University, Boston, Massachusetts 02115, United States.|⊥Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, United States.
authors.forename: Meni
authors.initials: M
authors.lastname: Wanunu
mesh_terms: D004277:DNA, Single-Stranded / Q000737:chemistry; D008567:Membranes, Artificial; D008982:Molybdenum / Q000737:chemistry*; D058608:Nanopores; D012825:Silicon / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry
chemical_list: D004277:DNA, Single-Stranded; D008567:Membranes, Artificial; D013431:Sulfates; D008982:Molybdenum; D012825:Silicon
keywords: 2D materials; DNA; MoS2; dichalcogenides; nanopores; transfer-free