Preparation of bismuth selenide nanoparticle

Abstract

The invention discloses a method for preparing bismuth selenide nano particles, which comprises preparation of starch solution, preparation of bismuth nitrate solution, preparation of sodium selenide sulfite solution, preparation of bismuth selenide colloidal solution and preparation of the bismuth selenide nano particles so as to obtain a novel semiconductor quantum dot material of the bismuth selenide nano particles, wherein the used raw material is nontoxic bismuth nitrate, the used surfactant or stabilizing agent is nontoxic pollution-free soluble starch, the used solvent is nontoxic pollution-free purified water, the used precipitating agent is nontoxic pollution-free acetone, and the used washing agent is nontoxic pollution-free acetone or anhydrous ethyl alcohol, so the method has little harm to human body and pollution to environment, has simple and reasonable process and lower cost for preparing the bismuth selenide nano particles, and develops a new way for the non-oxide semiconductor quantum dot material. Therefore, the method for preparing the bismuth selenide nano particles has the advantages of simple and reasonable process, lower cost, innocuity and little pollution.

Description

technical field [0001] The invention relates to a preparation method of a non-oxide semiconductor quantum dot material, in particular to a preparation method of bismuth selenide nanoparticles. Background technique [0002] Non-oxide semiconductor quantum dot materials such as CdS, CdSe, PbS, PbSe, etc. have been widely researched and developed. When their particle size is comparable to or smaller than the Bohr radius of their excitons, there will be obvious quantum confinement effects. , so that these nanomaterials have different physical and chemical properties from their bulk materials. These nanoparticle materials have a wide range of applications in optics, optoelectronic devices, etc. For example, as luminescent materials, quantum dot lasers or optical amplifiers may be developed, bioluminescent markers, and solar cell materials. Since the Bohr radii of excitons of cadmium selenide and lead selenide are relatively large, it is easy to prepare nanoparticle materials tha...

AI Technical Summary

Problems solved by technology

But cadmium and lead are all highly toxic substances, can endanger human health and environmental pollution, and the preparation method of cadmium selenide and lead selenide also is to adopt toxic surfactant or stabilizer such as NTA(N(CH 2 COONa) 3 ), TOPSe (tri-n-octylphosphorus selenium), etc., the China Invention Patent Authorization Announcement No. 1288716, the announcement date is December 6, 2006, the name is a method for preparing semiconductor quantum dot materials, and the disclosed method is based on inorganic cadmium Salt or cadmium oxide as raw materials, diphenyl ether, N-N dimethylformamide, N-methylpyrrolidone, trioctylphosphine, chloroform, toluene, etc. as media or solvents to prepare semiconductor quantum dot material cadmium selenide

Therefore, the requirements for the process conditions for the preparation of cadmium selenide and lead selenide are relatively high, the preparation cost is also increased accordingly, and the health hazards to the preparation personnel are relatively large, and the pollution to the environment is also relatively large.

Bismuth selenide is a better substitute for cadmium selenide and lead selenide. It also has a larger exciton Bohr radius and is easy to achieve quantum confinement effects. Bismuth is a non-toxic material, so bismuth selenide nanoparticles (particle size is not greater than 20nm) is the non-oxide semiconductor quantum dot material that has good development prospect; Also there is no report of the preparation method of bismuth selenide nanoparticle material at present

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