Silver nanowire-m-phase vanadium dioxide nanoparticle composite film and preparation method thereof

Abstract

The invention discloses a silver nanowire and M-phase vanadium dioxide nanoparticle composite film and a preparation method thereof. The film is prepared from silver nanowire film with the film thickness of 80-120 nm and an M-phase vanadium dioxide nanoparticle film with the film thickness of 100-1000 nm, which are sequentially coated on a substrate, wherein the linear diameter of the silver nanowire for forming the silver nanowire film is 40-100 nm, and the wire length is 50-100 microns; the particle size of the M-phase vanadium dioxide nanoparticle for forming the M-phase vanadium dioxide nanoparticle film is 20-100 nm. The preparation method comprises the following steps: spin coating or blade coating the substrate with silver nanowire isopropanol solution with the concentration of 0.3-1.5 wt%, drying the substrate, spin coating or blade coating the substrate coated with the silver nanowire film with M-phase vanadium dioxide nanoparticle aqueous solution with the concentration of 2-5 wt% or ethanol solution, and at last preparing the target product. The silver nanowire and M-phase vanadium dioxide nanoparticle composite film is low in phase transformation voltage; the preparation method is convenient and low in cost; the composite film can be widely applied to the fields such as energy-saving windows, gas sensors, optoelectronic switches, thermistors, infrared remote sensing receivers and uncooled focal plane radiation detectors.

Description

technical field [0001] The invention relates to a composite film and a preparation method thereof, in particular to a silver nanowire-M phase vanadium dioxide nanoparticle composite film and a preparation method thereof. Background technique [0002] Among many thermally induced phase change materials, vanadium dioxide (VO 2 ) is a research hotspot. VO 2 Low temperature monoclinic phase VO will occur around 68°C 2 (M) and high temperature rutile phase VO 2 Reversible structural phase transition between (R). With the phase transition, VO 2 The resistivity and infrared light transmittance will change abruptly. Taking advantage of its phase transition, VO 2 It has potential application prospects in the fields of energy-saving windows, gas sensors, photoelectric switches, thermistors, infrared remote sensing receivers and uncooled focal plane radiation detectors. [0003] At present, in order to realize the VO 2 The controllable phase transition has made unremitting eff...

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Problems solved by technology

Although this vanadium dioxide film can undergo a phase transition under the action of an external electric field, it also has shortcomings. First, the electric field is directly applied to the vanadium dioxide film to produce a Joule heat-induced phase transition. Vanadium itself has poor phase conductivity at low temperature, so a higher applied voltage is required to induce phase transition; secondly, the equipment required for preparation is expensive and the process conditions are harsh, especially it cannot be formed on a flexible substrate.

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