Two-dimensional MoS2 attracts considerable research interest, with substantial prospects for nanoelectronics and -optics. The susceptibility of single layer MoS2 to charge carrier modulation by the subjacent SiO2 substrate has been described. Here we report the effect on single layer MoS2 of functionalization of the SiO2 support by monolayer self-assembly of aliphatic and aromatic organophosphonates that are terminated with hydroxy-, nitro-, thiol-, phosphonic acid, or maleimido groups. Molecular simulations gave insight into the spatial arrangement of the various organophosphonates on the SiO2 surface, and functionalization was monitored by static water contact angle analysis, atomic force microscopy, and X-ray photoelectron spectroscopy. Raman spectroscopy further characterized an effect of the various substrates: A shift relative to that for single-layered MoS2 transferred onto pristine SiO2 was measured for the Raman-active out-of-plane A1g mode for heterostructures containing a functional interlayer, which indicates a modulation of the intrinsic doping behavior of the MoS2 nanomembrane, and which illustrates the capabilities of interface engineering in MoS2-based heterostructures.

Tuning the physical properties of MoS2 membranes through organophosphonate-based surface functionalization

253rd National Meeting (2017)

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