2015/05/11 by Pradeep Waduge, Waduge, Pradeep, Ismail Bilgin +15
Engineering · Materials Science · #2D Materials and Applications #FOS: Physical sciences #Graphene research and applications #Materials Science (cond-mat.mtrl-sci) #Nanopore and Nanochannel Transport Studies #Nanowire Synthesis and Applications
paper · pdf · doi:10.48550/arxiv.1505.02832
openalex publication_date 2015/05/11 · openalex created_date 2022/09/02 · openalex updated_date 2026/07/28
We show that atomically thin molybdenum disulfide (MoS2) crystals can grow\nwithout any underlying substrates into free-standing atomically-thin layers,\nmaintaining their planar 2D form. Using this property, we present a new\nmechanism for 2D crystal synthesis, i.e. reagent-limited nucleation near an\naperture edge followed by reactions that allow crystal growth into the\nfree-space of the aperture. Such an approach enables us, for the first time,\nthe direct and selective growth of freestanding membranes of atomically thin\nMoS2 layers across micrometer-scale pre-fabricated solid-state apertures in\nSiNx membranes. Under optimal conditions, MoS2 grows preferentially across\napertures, resulting in sealed membranes that are one to a few atomic layers\nthick. Since our method involves free-space growth and is devoid of either\nsubstrates or transfer, it is conceivably the most contamination-free method\nfor obtaining 2D crystals reported so far. The membrane quality was\ninvestigated using atomic-resolution transmission electron microscopy, Raman\nspectroscopy, photoluminescence spectroscopy, and low-noise ion-current\nrecordings through nanopores fabricated in such membranes.\n