Exploration and development of new two-dimensional (2D) materials with good stability and remarkable physical properties have become the research hotspots. We report for the first time the monodispersity of ultrathin MoO₂ nanosheets have been synthesized through an improved chemical vapor deposition (CVD) method using only molybdenum trioxide as precursor. The grown MoO₂ nanosheets have an average thickness of ∼ 5 to 10 nm and exhibit good crystal-quality. Temperature-dependent Raman spectra show that the ultrathin MoO₂ nanosheets have high thermal stability up to 503 K. In addition, the first order temperature coefficients of the MoO₂ characteristic Raman modes O₁–Mo and O₂–Mo were firstly found to be -1.91×10^-2 and -3.94×10^-2 cm⁻¹/K, respectively. Two-probe electrical measurements show that the as-fabricated ultrathin MoO₂ nanosheets devices preserve a high electrical conductivity in ambient conditions, reaching up to 200 - 475 S/cm. The exceptionally high conductivity of individual MoO₂ nanosheet is ascribed to the unique crystal structure. Our results demonstrate that the ultrathin MoO₂ nanosheets show great potential applications in constructing new integrated electronic devices and systems.