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F-doped VO2 (M1) nanoparticles were prepared via one-pot hydrothermal synthesis.The F-doping can minimise the size of the VO2 (M1) nanoparticles, induce a homogeneous size distribution and effectively decrease the phase transition temperature to 35 ℃ at 2.93% F in VO2.VO2 smart glass foils obtained by casting these nanoparticles exhibit excellent thermochromism in the near-infrared region, which suggests that these foils can be used for energy-efficient glass.Compared to a pure VO2foil, the 2.93% F-doped VO2 foil exhibits an increased solar-heat shielding ability(35.1%) and a modified comfortable colour, while still retaining an excellent solar modulation ability (10.7%) and an appropriate visible transmittance(48.7%).The F-doped VO2 foils are the first to simultaneously meet the requirements of a reduced phase transition temperature, diluted colour and excellent thermochromic properties, and these properties make the F-doped VO2 foils suitable for commercial applications in energy efficient glass.