| Abstract
| - Tungsten-doped vanadium dioxide (VO2) nanopowders were synthesized by thermolysis of (NH4)5[(VO)6(CO3)4(OH)9]·10H2O at low temperature with, to the best of our knowledge, active white powdery tungsticacid (WPTA) used as a substitutional dopant for the first time. The change in electrical resistance due to thesemiconductor−metal transition was measured from −5 to 150 °C by the four-probe method. Differentialscanning calorimetry and the resistance−temperature curve of the nanopowders indicated that the phasetransition temperature of VO2 powders was 67.15 °C, but for W-doped VO2, the temperature was reduced to26.46 °C. The results indicated that WPTA was found to be exceptionally effective as a dopant for reducingthe transition temperature.
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