Monoclinic phase vanadium dioxide nanowire and preparation method and application thereof

A vanadium dioxide nanometer, monoclinic phase technology, applied in vanadium oxide, nanotechnology and other directions, can solve the problems of complex process, low safety factor, complicated method, etc., and achieves simple preparation process, low production cost and uniform distribution. Effect

Active Publication Date: 2017-02-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wu Xingcai et al. (see Wu X, Tao Y, Dong L, etal. Materials Research Bulletin, 2005, 40(2): 315-321) synthesized VO by two-step hydrothermal method 2 nanowires, first synthesized (NH 4 ) 0.5 V 2 o 5 nanowire precursors, then annealed at 570 °C in vacuum to obtain VO 2 Nanowires, the method needs two steps to realize, the method is complicated, and consumes a lot of energy; CN101830510B Chinese patent document discloses a preparation method and application of rutile phase vanadium dioxide nanowires, the method first prepares vanadium ion solution or suspension , synthesized by hydrothermal reaction, then take out the hydrothermal kettle and put it into a water bath for rapid cooling, and naturally cool to room temperature to obtain VO 2 Nanowires, although this method adopts...

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  • Monoclinic phase vanadium dioxide nanowire and preparation method and application thereof
  • Monoclinic phase vanadium dioxide nanowire and preparation method and application thereof
  • Monoclinic phase vanadium dioxide nanowire and preparation method and application thereof

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Embodiment 1

[0036] A kind of monoclinic phase VO of the present invention 2 The preparation method of nanowires specifically includes the following steps:

[0037] (1) 1.82g (0.01mol) vanadium pentoxide and 11.38g (0.04mol) stearic acid were added to 80mL deionized water, stirred for 30 minutes to form a turbid liquid;

[0038] (2) transfer the obtained turbid liquid to a 100mL hydrothermal reactor (the filling rate of the reactor is 80%), and perform a hydrothermal reaction at 280° C. for 12h;

[0039](3) After the hydrothermal reaction is completed, after the reactor is naturally cooled, the product in the reactor is taken out and centrifuged, and the product obtained after the centrifugation is alternately washed 3 times with acetone and absolute ethanol, and finally at 80 ° C. Under vacuum drying for 12h, the monoclinic phase VO was obtained. 2 Nanowires.

[0040] figure 1 VO prepared in this example 2 XRD pattern of nanowires, it can be seen from the figure that VO 2 The nanowi...

Embodiment 2

[0042] A kind of monoclinic phase VO of the present invention 2 The preparation method of nanowires specifically includes the following steps:

[0043] (1) 1.82g (0.01mol) vanadium pentoxide and 5.69g (0.02mol) stearic acid were added to 80mL deionized water, stirred for 30 minutes to form a turbid liquid;

[0044] (2) transfer the obtained turbid liquid to a 100mL hydrothermal reactor (the filling rate of the reactor is 80%), and perform a hydrothermal reaction at 280° C. for 18h;

[0045] (3) After the hydrothermal reaction is completed, after the reactor is naturally cooled, the product in the reactor is taken out and centrifuged, and the product obtained after the centrifugation is washed alternately with acetone and dehydrated ethanol 3 times in turn, and finally at 60 ° C Under vacuum drying for 15h, the monoclinic phase VO was obtained. 2 Nanowires.

[0046] After testing, the VO prepared in this example 2 Nanowires with uniform size distribution, smooth surface and...

Embodiment 3

[0048] A kind of monoclinic phase VO of the present invention 2 The preparation method of nanowires specifically includes the following steps:

[0049] (1) 1.82g (0.01mol) vanadium pentoxide and 17.07g (0.06mol) stearic acid were added to 80mL deionized water, and stirred for 30 minutes to form a turbid liquid;

[0050] (2) transfer the obtained turbid liquid to a 100mL hydrothermal reactor (the filling rate of the reactor is 80%), and perform a hydrothermal reaction at 260° C. for 24h;

[0051] (3) After the hydrothermal reaction is completed, after the reactor is naturally cooled, the product in the reactor is taken out and centrifuged, and the product obtained after the centrifugation is alternately washed 3 times with acetone and absolute ethanol, and finally at 100 ° C. Under vacuum drying for 8h, the monoclinic phase VO was obtained. 2 Nanowires.

[0052] After testing, the VO prepared in this example 2 The size distribution of nanowires is uniform (diameter is 120-1...

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Abstract

The invention discloses a method for preparing a monoclinic phase vanadium dioxide nanowire. The method comprises the following steps: mixing a vanadium source, stearic acid and water, carrying out a hydrothermal reaction on the obtained mixed solution, sequentially centrifuging, washing and drying the obtained product after the hydrothermal reaction is completed, thereby obtaining the monoclinic phase vanadium dioxide nanowire. By utilizing the dual effects of inducing anisotropic growth of crystals through a reducing agent and a surfactant in the stearic acid, the monoclinic phase vanadium dioxide nanowire with thermal induced phase transition property can be prepared in a one-step process, the preparation process is simple, complicated equipment is not needed, the production cost is low, the reaction conditions are easy to control, and large-scale industrial production is easily realized; and moreover, the monoclinic phase vanadium dioxide nanowire is uniform in distribution and high in crystallinity and can be applied to the fields of smart windows, photoelectric switches, camouflage and stealth, infrared detection devices and the like.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and in particular relates to a vanadium dioxide nanowire and a preparation method and application thereof. Background technique [0002] Since 1959, Morin of Bell Labs first discovered vanadium dioxide (VO 2 ) has excellent metal-insulator phase transition properties since the VO 2 The abrupt changes in optical, electrical and magnetic properties before and after the phase transition have become the focus of researchers' attention. The phase transition temperature of vanadium dioxide is around 68°C. When the temperature is lower than 68°C, the VO 2 It is an M-phase monoclinic structure, showing the characteristics of an insulator; when the temperature is higher than 68 °C, VO 2 It is transformed into an R-phase rutile structure and exhibits metallic properties. VO 2 The abrupt change in resistivity before and after the phase transition can reach 4 orders of magnitude, and the ab...

Claims

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Application Information

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IPC IPC(8): C01G31/02B82Y40/00
CPCC01G31/02C01P2002/72C01P2002/80C01P2002/88C01P2004/03C01P2004/16
Inventor 嵇海宁刘东青程海峰张朝阳郑文伟
Owner NAT UNIV OF DEFENSE TECH
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