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Despite the use of transition metal dichalcogenides being widespread in various applications, the knowledge and applications of Mo_xW_1−xS₂ compounds are relatively limited. In this study, we deposited a MoW alloy on a Si substrate using a sputter system. Consequently, we successfully utilized a furnace to sulfurize the MoW alloy from 800 to 950 °C, which transferred the alloy into a Mo_xW_1−xS₂ ternary compound. The Raman spectra of the Mo_xW_1−xS₂ samples indicated an additional hybridized Raman peak at 375 cm⁻¹ not present in typical MoS₂ and WS₂. With increasing sulfurization temperature, the scanning electron microscopy images revealed the surface morphology of the Mo_xW_1−xS₂ gradually becoming a sheet-like structure. The X-ray diffraction results showed that the crystal structure of the Mo_xW_1−xS₂ tended toward a preferable (002) crystal orientation. The I–V results showed that the resistance of Mo_xW_1−xS₂ increased when the samples were sulfurized at a higher temperature due to the more porous structures generated within the thin film. Furthermore, a high-temperature coefficient of resistance for the Mo_xW_1−xS₂ thin film sulfurized at 950 °C was about −1.633%/K⁻¹. This coefficient of resistance in a Mo_xW_1−xS₂ thin film indicates its suitability for use in thermal sensors.