Cadmium selenide flower-shaped microspheres prepared from nanosheets with hydrophilic surfaces as well as preparation method and application of microspheres

Abstract

The invention discloses cadmium selenide flower-shaped microspheres prepared from nanosheets with hydrophilic surfaces. The microspheres are flower-shaped microspheres prepared from cadmium selenide nanosheets which are 2-14nm thick, and the diameters of the flower-shaped microspheres are 2-8 microns. Meanwhile, the invention discloses a preparation method and application of the microspheres. By using cadmium acetate and selenium dioxide as raw materials, the raw materials are dissolved in a solvent containing diethylenetriamine and reaction is carried out in a reaction kettle at a certain temperature to obtain a target product. The unit structure of the microspheres is an ultrathin nanosheet structure. The structure ensures that cadmium selenide has a quantum confinement effect, so that the structure has a proper energy gap and the microspheres are micron orders, and thus the catalyst is repeatedly used for many times. The microspheres further have hydrophilic properties and can be dispersed in an aqueous solution well. The preparation method of the microspheres disclosed by the invention is simple in step, the product can be prepared in batches, and the prepared nanosheets are controllable in thickness and show a strong quantum confinement effect, so that the cadmium selenide flower-shaped microspheres can be widely applied to the field of photocatalysis and the like.

Description

technical field [0001] The invention relates to the field of preparation of inorganic nanometer materials. More specifically, it relates to a cadmium selenide flower-like microsphere composed of nanosheets with a hydrophilic surface, its preparation method and application. Background technique [0002] Cadmium selenide semiconductor is a direct bandgap material, which has two structures, wurtzite and sphalerite structures, and the bandgap widths are 1.75 and 1.9eV, respectively. As an important II-VI semiconductor, it has broad application prospects in the fields of light-emitting diodes, biomarkers, solar cells, and photocatalysis. In recent years, people have applied it in the photocatalytic hydrogen production system by controlling its size in the nanometer range, such as cadmium selenide quantum dots and cadmium selenide nanorods. Due to the quantum confinement effect, its materials show superior photocatalytic Performance (references: J.U.Bang, S.J.Lee, J.S.Jang, W.Ch...

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Problems solved by technology

At present for the synthetic report of cadmium selenide nanosheet material, there are still many deficiencies in the synthetic method of existing reports, as: (1) utilize the synthetic cadmium selenide nanoribbon by oil phase method (references: Joo, J.S.Son, S.G.Kwon, J.H.Yu and T.Hyeon, Journal of the American Chemical Society, 2006, 128, 5632-5633), although it has been reported that the nanobelt has good hydrogen production performance, but it needs Carbon monoxide is a raw material, which has certain dangers. In addition, the surface of its synthesized product is hydrophobic, and its dispersibility in aqueous solution is very poor, which is not conducive to the application of aqueous phase systems; (2) Utilize high-temperature solid-phase method to synthesize cadmium selenide nanoribbons Materials (References: C.Ma, Y.Ding, D.Moore, X.D.Wang and Z.L.Wang, Journal of the American Chemical Society, 2004, 126, 708-709), this method consumes a lot of energy, and the product shape is thick Thick, the quantum confinement effect is not obvious

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