It is reported that the researchers combined the advantages of graphene's unique two-dimensional layered structure, excellent electrochemical performance and the wide application characteristics of WO3 nanowires in various dingal fields, and assembled WO3 nanowires as guest materials into the graphene host material. , Control the synthesis conditions to prepare a unique one-dimensional and two-dimensional nanocomposite material, which has great potential application prospects in the fields of chemistry, optics and electricity.
The graphene loaded WO3 nanowire composite material is characterized in that the WO3 nanowire has a diameter of 10-30 nanometers and a length of 50-600 nanometers, which penetrates or is distributed on the inner layer or surface of the layered graphene host material.
A preparation method of graphene loaded WO3 nanowire composite material includes the following steps:
(1) Dissolve sodium tungstate in distilled water, add an acidity regulator, and adjust the concentration of the sodium tungstate solution to 0.1~1.0 and the pH to 1.0~20;
(2) Transfer the sodium tungstate solution obtained in step (1) to a hydrothermal reactor, and react hydrothermally at 120~200°C for 10~24 hours;
(3) Pour the tungsten oxide nanomaterial prepared in step (2) into a vacuum suction filter, wash with deionized water, vacuum dry, and sinter at 300~500°C in an air atmosphere for 2~4 After hours, WO3 nanowires were obtained.
(4) Disperse graphite oxide ultrasonically in a reducing alcohol, adjust the concentration of graphite oxide to 0.5-10 mg/mL, and the ultrasonic time to be 1 to 3 hours;
(5) Mix the WO3 nanowires prepared in step (3) with the graphite oxide dispersion prepared in step (4). After mixing, the quality ratio of WO3 nanowires to graphite oxide is 1:0.01~0.5, and then transfer In the photocatalytic reactor, photocatalytic reduction reaction under simulated sunlight for 0.5 to 3 hours;
(6) Pour the product of step (5) into a vacuum filtration device for suction filtration, wash with deionized water, and vacuum dry to obtain a graphene-loaded WO3 nanowire composite material.
Precautions of the preparation method: In step (1), the acidity regulator is one or a combination of acetic acid, hydrochloric acid and hydrogen peroxide; in step (4), the reducing alcohol The agent is one or a combination of methanol, ethanol or ethylene glycol; the simulated sunlight is a xenon lamp with a power of 100W, 150W, 200W or 500W.
The advantages of the synthesis method are that the reduction of graphene and the formation of nanocomposite materials are simple, the reagents are cheap, which is conducive to large-scale preparation, and at the same time, it provides a green and environmentally friendly reduction method for the reduction of graphite oxide to prepare graphene.
