Application and synthesis of doped vanadium dioxide powder and dispersing agent

Abstract

The present invention relates to a doped vanadium dioxide powder, a dispersion, and preparation methods and applications therefor. The chemical composition of the doped vanadium dioxide powder is V1-xMxO2, 0<x≦0.5, wherein M is a doping element and said doping element is used to control the size and morphology of the doped vanadium dioxide powder. The vanadium dioxide powder of the present invention has evenly sized particles and exhibits excellent dispersibility. The preparation methods for the present invention are easy to implement, low in cost, provide high yield, and are suitable for large scale production.

1 . A kind of doped vanadium dioxide powder, the doped powder having a chemical composition of V 1-x M x O 2 , 0<X≦0.5, and M is a doping element, which is introduced to control a particle size and a morphology of the doped powder, the doping element M is a transition element adjacent to vanadium in a periodic table of elements, Tin and one of its adjacent elements or their random combination, wherein the transition metal element adjacent to vanadium in the periodic table of elements includes titanium, chromium, manganese, iron, cobalt, nickel, copper and zinc, tin and its adjacent elements include indium, stibium, stannum, gallium, germanium, lead and bismuth, and wherein the doped powder is in particle form of particles that have a aspect ratio of 1:1-10:1, and wherein the particle size is no more than 100 nm in at least one dimension. 
     
     
         2 . (canceled) 
     
     
         3 . The doped vanadium dioxide powder of  claim 1 , wherein 0.03 <X≦0.3. 
     
     
         4 . (canceled) 
     
     
         5 . The doped vanadium dioxide powder of  claim 1 , wherein 0.005<X≦0.025. 
     
     
         6 . (canceled) 
     
     
         7 . (canceled) 
     
     
         8 . (canceled) 
     
     
         9 . The doped vanadium dioxide powder of  claim 1 , wherein the particle size is no more than 100 nm in all three dimensions. 
     
     
         10 . (canceled) 
     
     
         11 . The doped vanadium dioxide powder of  claim 1 , wherein a powder component includes rutile vanadium dioxide. 
     
     
         12 . A hydrothermal method for preparing the doped vanadium dioxide powder of  claim 1 , the method comprising a step of a precursor treatment of titrating a quadrivalent vanadium aqueous solution with a basic reagent to obtain a precursor suspension, wherein the precursor treatment involves titrating the quadrivalent vanadium aqueous solution until the emergence of the precursor suspension. 
     
     
         13 . (canceled) 
     
     
         14 . The method of  claim 12 , wherein a mole ratio of the basic reagent to the quadrivalent vanadium aqueous solution is from 1:50 to 10:1. 
     
     
         15 . The method of  claim 14 , wherein the mole ratio of the basic reagent to the quadrivalent vanadium aqueous solution is 1:5 to 2:1. 
     
     
         16 . (canceled) 
     
     
         17 . The method of  claim 12 , further comprising a process of introducing elements that can regulate a phase transition temperature of vanadium dioxide, and/or elements that regulate particle size and morphology of vanadium dioxide. 
     
     
         18 . (canceled) 
     
     
         19 . The method of  claim 17 , wherein a mole ratio of the doping element to the quadrivalent vanadium aqueous solution is 1:1000 to 1:1. 
     
     
         20 . (canceled) 
     
     
         21 . (canceled) 
     
     
         22 . The method of  claim 12 , further comprising a process of preparing a quadrivalent vanadium aqueous solution. 
     
     
         23 . The method of  claim 22 , further comprising a process of dissolving a soluble raw material into water, the soluble raw material including trivalent, quadrivalent, or pentavalent vanadic salts. 
     
     
         24 . The method of  claim 22 , further comprising a step of oxidization, reduction or dissolving pretreatment of insoluble vanadium raw material, the insoluble vanadium raw material including metal vanadium, vanadium oxides or their mixture. 
     
     
         25 . (canceled) 
     
     
         26 . The method of  claim 12 , further comprising a step of transferring the basic reagent treated quadrivalent vanadium aqueous solution to a hydrothermal reactor to undergo a hydrothermal reaction, for which a packing ratio of the reactor is 20%-90% , a reaction temperature is 200-400° C. and a holding time is 1-240 h. 
     
     
         27 . The method of  claim 26  wherein the holding time is 2-120 h. 
     
     
         28 . (canceled) 
     
     
         29 . The method of  claim 26 , wherein the packing ratio is 30-80%. 
     
     
         30 . (canceled) 
     
     
         31 . The method of  claim 26 , wherein the holding time is 4-60 h. 
     
     
         32 . (canceled) 
     
     
         33 . A vanadium dispersion, the dispersion including any kind of the doped vanadium dioxide powder of  claim 1 . 
     
     
         34 . The dispersion of  claim 33 , wherein a concentration of vanadium dioxide is 0.1-100 g/L. 
     
     
         35 . Application of any kind of the doped vanadium dioxide powder of  claim 1  in fabricating energy conservation and emission reduction or energy information devices.