I added V2O5 as precursor for vanadium 0.5g in 30ml of DI water. I added 0.5g of oxalic acid anhydrous in 10ml of DI water, which functions as a reducing agent. I added the reducing adent to the precursor solution, thereby my total volume now is 40ml containg V2O5 and oxalic acid. I stirred the solution for half an hour at 60C, but the solution only turned to green solution instead of blue solution according to the references. Can anyone explain it? I added oxalic acid anhydrous instead of oxalic acid dihydrate, could this be a reason?
" could this be a reason? " Definitely not. Did you follow a published procedure to make VO2 nanoparticles? If not, it might be thousands of reasons why you failed.
I did synthesize the VO2 particles. After constant stirring for 1 hour of the same solution I was able to get the blue colored solution indicating the formation of VO2 and reduction of vanadium from +5 oxidation state to +4 oxidation state.
Looks nice - Were you measuring the temperature directly or simply setting the hotplate to 81 and 100 C? The reaction time and resulting particle size will likely be affected by the operating temperature of the solution itself. Sometimes stirring rate can also affect the particle sizes.
Joel Kumlin The display is incorrect, the temperature was maintained at 60C using a thermometer. Thank for your feedback on mentioning that stirring rate also affects particle size, could you suggest me a suitable RPM which I am advised to maintain? (i was maintaining here 700 RPM)
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