Rutile phase vanadium dioxide nanopowder and its preparation method and application
A technology of vanadium dioxide nanometer and rutile phase, which is applied in the direction of vanadium oxide, nanotechnology, nanotechnology, etc., can solve the problem of single morphology of rutile phase vanadium dioxide nanopowder, and achieve simple preparation method, high yield, good performance effect
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Embodiment 1
[0045] Step A) Weigh 1.0 g of vanadium pentoxide and 1.8 g of oxalic acid dihydrate, stir in 40 mL of deionized water until completely dissolved to obtain a tetravalent vanadium ion precursor solution. Dilute the precursor solution to 160mL with deionized water, take out 40mL of it and put it in a 100mL hydrothermal kettle, react at 180°C for 24 hours, and obtain the vanadium dioxide precursor after the reaction solution is centrifuged and dried.
[0046] Step B) Weigh 0.4 g of the vanadium dioxide precursor obtained above, put it into 50 mL of a solution of deionized water and absolute ethanol with a weight percentage of 1:4, ultrasonically disperse for 30 minutes, adjust the pH to 11 with ammonia water, and 70 μL of tetraethyl orthosilicate was slowly added, stirred for 4 hours, filtered, washed, and dried at 110° C. for 2 hours to obtain a silicon oxide-wrapped vanadium dioxide precursor.
[0047] Step C) Weighing a small amount of the aforementioned silicon oxide-wrapped v...
Embodiment 2
[0057] Step A) take by weighing 1.0g vanadium pentoxide and a certain amount of WO 3 (W: V=1at%), measure 40mL deionized water, stir and add 0.1mL hydrogen peroxide to obtain an orange-red liquid, then add an appropriate amount of oxalic acid dihydrate until a blue-green solution is obtained; transfer this liquid into a hydrothermal reaction kettle and Sealed and kept at 180°C for 6 hours to obtain a strip-shaped B-phase vanadium dioxide precursor. SEM observed that its length is about 4-6 μm, width is about 50-100 nm, thickness is 10-30 nm, and the ratio of length to thickness is about 133~600.
[0058] Step B) Weigh 0.4 g of the above-mentioned precursor, and wrap it with silicon oxide in the same way as in Example 1 to obtain a silicon oxide-wrapped vanadium dioxide precursor with a ribbon structure.
[0059] Step C) heating the obtained silicon oxide-wrapped vanadium dioxide precursor to 800° C. under vacuum or an inert atmosphere, keeping it warm for 5 minutes, and obtai...
Embodiment 3
[0062] Step A) Weigh 1.2g of vanadyl acetylacetonate, measure 20mL of deionized water and 20mL of methanol, stir gently to obtain a suspension, transfer it to a 100mL hydrothermal kettle and react at 180°C for 48 hours, and centrifuge the reaction product After collection, a blue-black powder is obtained, which is washed and dried for later use. SEM observation of the obtained short-flaky B-phase vanadium dioxide precursor with similar length and width, the length is about 500-800nm, the width is about 300-500nm, the thickness is 30-50nm, and the length-thickness ratio is about 10-25.
[0063] Step B) Weigh 0.2 g of the above-mentioned precursor, and wrap it with silicon oxide in the same way as in Example 1 to obtain a silicon oxide-wrapped vanadium dioxide precursor with an equirectangular sheet structure.
[0064] Step C) The obtained silicon oxide-wrapped vanadium dioxide precursor is heated to 700° C. under vacuum or an inert atmosphere, kept for 20 minutes, and after coo...
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