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Nanomechanical and optical properties of C60 -2DM heterostrucures fabricated by a hybrid elecrospray and Langmuir-Blodgett

Abstract: C60 is a fascinating molecule due to its unusual and sometimes spectacular mechanical and optoelectronic properties,allowing a series of interesting application in the fields of nano-science, material science, optics and electrics [1-4]. However,since its discovery a large number of experiments have been carried out to study the intriguing proprieties of this exciting material but methods for preparing macroscopic quantities of close-packed monolayer C60 in a facile and scalable way has proved challenging [5, 6]. In addition, the combination of C60 with 2 dimensions materials (2DM) are recently employed in material science in order to create new “sandwiched” structures made by alternating 2D materials with organic ultrathin film layers. These van der Waals heterostructures are particular promising due to the combination of the superior electronic and optical properties of 2DM with the low thermal conductivity and electrical properties of organic/molecularthin film, opening a series of new opportunities optoelectronics and thermoelectric [7,9].

Here we report a potential method for achieving monolayer (ML) production of fullerene by a hybrid electrospray ion-isation system and Langmuir-Blodgett (LB) technique at the air-water interface and transferred onto different substrates.We investigated the optimisation of the deposition through monitoring the mean molecular area (Π-MMA) as a functionof surface pressure (isotherms), Brewster angle microscopy (BAM), Raman spectroscopy and optical microscopy. Themorphology, mechanical and thermal proprieties were measured by a a range of scanning probe microscopy techniques.C 60 ML were subsequently capped with MoS2 and enhancement of PL emission of MoS 2 was observed, attributed to thecoupling effect between the two materials.