Vanadium dioxide (VO2) thin films are key materials for thermochromic smart windows and commonly have a typical phase transition (insulator to metal phase) at a transition temperature of 68 degrees C. This research, however, found that highly crystallized VO2 nanoparticles can be successfully coated on a glass substrate with added functionalities, such as higher luminous transmittance and transition efficiency. The transition temperature revealed that the VO2 nanoparticles with post thermal treatment at 600 degrees C also clearly exhibited a reduced transition temperature of 69 degrees C in the heating curve, 59 degrees C in the cooling curve, and a transition width of 10 degrees C. By nanopatterning the thin films, we were able to prepare VO2 thin films with higher luminous transmittance than that attained with non-patterned VO2 thin films. The enhanced transition property was demonstrated using highly crystallized VO2 nanoparticles induced by post thermal treatment, and the luminous transmittance was improved by the nanopattems on the surface of the VO2 thin films.