uring the preparation of the tungsten-based precursor solution, a complicated set of reactions take place over several days. This is indicated by the many continuous changes in the colour of the mixture of WCl6 and ethanol. In accordance with the formation of vanadium ethoxide reported previously by Livage et al. [33], the possible reaction path for the dissolution of WCl6 in ethanol is
Most of the HCl is lost as gas bubbles, which visibly effervesce from the liquid. Similar reaction routes are expected for the vanadium dioxide precursor solution.
For the synthesis of WO3, an aliquot of 5.3 mg of a dark-blue WCl6 powder was dissolved in 500 ml of ethanol in an argon environment, resulting in a light blue to light-yellow liquid. When this liquid was irradiated with 5,000 saw-tooth-shaped pulses from a 248-nm KrF excimer laser, with a fixed energy of 10 mJ at 8 Hz, the light yellow liquid turned to blue-black. For the production of VO2, one part of V2O5(in which molecule the V takes the valence of 5+) and two parts of VCl3 (where V has a valence of 3+) were dissolved in ethanol. The ratio was chosen to produce a stoichiometry of VO2 in which molecule the V atom has a valence of 4+.
uring the preparation of the tungsten-based precursor solution, a complicated set of reactions take place over several days. This is indicated by the many continuous changes in the colour of the mixture of WCl6 and ethanol. In accordance with the formation of vanadium ethoxide reported previously by Livage et al. [33], the possible reaction path for the dissolution of WCl6 in ethanol is Most of the HCl is lost as gas bubbles, which visibly effervesce from the liquid. Similar reaction routes are expected for the vanadium dioxide precursor solution.For the synthesis of WO3, an aliquot of 5.3 mg of a dark-blue WCl6 powder was dissolved in 500 ml of ethanol in an argon environment, resulting in a light blue to light-yellow liquid. When this liquid was irradiated with 5,000 saw-tooth-shaped pulses from a 248-nm KrF excimer laser, with a fixed energy of 10 mJ at 8 Hz, the light yellow liquid turned to blue-black. For the production of VO2, one part of V2O5(in which molecule the V takes the valence of 5+) and two parts of VCl3 (where V has a valence of 3+) were dissolved in ethanol. The ratio was chosen to produce a stoichiometry of VO2 in which molecule the V atom has a valence of 4+.
การแปล กรุณารอสักครู่..