Silver-molybdenum sulfide dimer colloidal motor and preparation method thereof

Abstract

The invention discloses a silver-molybdenum sulfide dimer colloidal motor and a preparation method thereof. The motor is a spherical molybdenum sulfide particle with silver nanoparticles attached; wherein, the spherical molybdenum sulfide particle has a particle size of 130-280nm, which is composed of molybdenum sulfide nanosheets, and the silver nanoparticle has a particle size of 20-80nm; Ammonium molybdate, thiourea, and polyvinylpyrrolidone are dispersed in deionized water in sequence and then sonicated, and then the obtained clear mixed solution is placed in a closed reaction at 180-220 ° C, and then centrifugally cleaned. After that, the obtained spherical molybdenum sulfide particles are first Disperse in deionized water, and then stir the spherical molybdenum sulfide particle dispersion, deionized water and tris(hydroxymethyl)aminomethane, quickly inject silver nitrate solution into it and continue stirring, and finally, carry out solid-liquid separation on the obtained intermediate product treatment to obtain the desired product. It has a wide range of applications and a small driving force, and is extremely easy to be widely commercialized in the fields of drug transportation, environmental purification, and ion detection.

Description

technical field [0001] The invention relates to a colloidal motor and a preparation method, in particular to a silver-molybdenum sulfide dimer colloidal motor and a preparation method thereof. Background technique [0002] Colloidal motors are a class of devices that can convert chemical, electrical, magnetic and other forms of energy into their own mechanical motion in liquid phase, and are expected to be able to complete complex tasks such as drug transport, environmental purification, and ion detection. The movement of the colloidal motor mainly depends on the asymmetric distribution of the catalytic components (such as Pt, Ag, etc., which can catalyze the hydrogen peroxide of fuel) on its own surface, so that the catalytic fuel generates a net resultant force and promotes the directional movement of the colloidal motor. . At present, some beneficial attempts and efforts have been made to obtain colloidal motors, such as "Catalytic Nanomotors: Self-Propelled Sphere Dimer...

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Problems solved by technology

Although this product reacts with hydrogen peroxide (H 2 o 2 ) catalytic decomposition to produce a net resultant force so that it can be used as a colloidal motor, but there are also shortcomings. First, the SiO constituting the dimer 2 Both microspheres and platinum spherical particles have larger volumes, among them, SiO 2 The diameter of microspheres is as high as 970nm, and the particle size of platinum spherical particles has also reached more than 300nm, which not only narrows the application range, but also greatly increases the resultant force required for driving; secondly, the preparation method is different from monolayer SiO 2 The technical difficulty and complexity of making microsphere templates requires annealing at 900°C for 3 hours and the output is too small, and it is impossible to obtain products with a wide application range and small driving forces

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