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A plethora of different morphologies are fabricated by the self assembly ofmolybdenum disulphide (MoS2) exfoliated flakes with the help ofLangmuir-Blodgett (LB) technique at the liquid/air interface. The MoS2 flakesare chemically exfoliated in various solvents but their stable sheet likeassembly on substrate is achieved only in case of the flakes exfoliated indimethylformamide. The density of the monolayer sheets is finely controlled bythe surface pressure while the stabilization of MoS2 LB film onto the watersubphase results in its self assembly into diffusion limited cluster aggregatesand fractals. We further demonstrate the effect of excitation on the emissionof LB assembled MoS2 sheets which reveals the existence of a new excitoncorresponding to 2.43 eV apart from the direct bandgap emission at 1.86 eV.Finally, field effect transistors are fabricated on SiO2/Si and a mobility of7.4 cm2V-1s-1 with a current on-off ratio of 10^5 is obtained. This workprovides a new approach for the systematic deposition of the solution processedexfoliated flakes on large scale as well as formation of pattern structures ina natural way.

Unique Morphologies of Molybdenum Disulphide: Sheets, Diffusion Limited  Cluster Aggregates and Fractals, by Langmuir- Blodgett Assembly for Advanced  Electronics