NOVELTY - Forming (100) two-dimensional transition metal dichalcogenide sheets, comprises adding (102) a crosslinking agent to an activating agent to form a solution, mixing (104) a two-dimensional transition metal dichalcogenide with the solution to form a mixture, and adding (106) a cleaving agent to the mixture to form at least one contiguous sheet of transition metal dichalcogenide.    USE - The method is useful for forming two-dimensional transition metal dichalcogenide sheets, preferably molybdenum disulfide sheet that is useful in a device and a supercapacitor, where the device comprises field-effect transistors, electrodes, sensors, photodetectors, capacitors, solar cells, light emitting diodes and/or thermoelectric devices, and a Schottky photodiode (all claimed).    ADVANTAGE - The method: forms the molybdenum disulfide sheets having a thickness of 50 nm to 100 mu , a capacitance of 1-100 nF and a band gap of 1.5-2 eV; and provides the supercapacitor having a specific capacitance of 20-50 F/g, an energy density of 150-500 W-hour/kg, and a power density of 200-900 W/kg (all claimed).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a device comprising at least one molybdenum disulfide sheet formed by thermally exfoliating a multilayered stack of molybdenum disulfide sheets formed by reacting amorphous molybdenum disulfide with a solution of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) hydrochloride, ammonia and N-hydroxysuccinimide, where each of the molybdenum disulfide sheets has an area of 1-25 cm2; and    (2) a supercapacitor, comprising a first electrode, a second electrode, and a dielectric layer disposed between the first electrode and the second electrode, where the first electrode and the second electrode are formed of molybdenum disulfide sheets.    DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram for forming two-dimensional transition metal dichalcogenide sheets.    Forming two-dimensional transition metal dichalcogenide sheets (100)    Adding crosslinking agent to activating agent (102)    Mixing two-dimensional transition metal dichalcogenide with solution (104)    Adding cleaving agent to mixture (106)    Exfoliating contiguous sheets of transition metal dichalcogenide (110)