AgInSe2 nanocrystalline and preparation method thereof

Abstract

The invention discloses AgInSe2 nanocrystalline and a preparation method thereof. The preparation method comprises the following steps: mixing and uniformly stirring silver nitrate, indium chloride and / or indium chloride tetrahydrate, selenium dioxide, polyvinylpyrrolidone and dimethyl formamide to obtain a precursor liquid; allowing the precursor liquid to have a constant-temperature reaction in a high-pressure kettle at the temperature of 160-220 DEG C for 3-20 hours to obtain the AgInSe2 nanocrystalline, wherein the AgInSe2 nanocrystalline is a metastable orthorhombic crystal system of which the space group is Pna21 and is soluble in water. The preparation method disclosed by the invention adopts simple and cheap raw materials and is simple in process, short in synthesis period, good in repeatability and environment-friendly; and the prepared AgInSe2 nanocrystalline can be well dispersed in a water phase and has application advantages in the fields such as biomedicines and water-phase optical catalysis.

Description

technical field [0001] The present invention relates to a kind of preparation method of nanocrystal and nanocrystal, particularly relate to a kind of AgInSe 2 Preparation method of nanocrystal and corresponding AgInSe 2 Nanocrystalline. Background technique [0002] I-III-VI 2 Semiconductor nanocrystals have many excellent properties, such as low toxicity, large light absorption coefficient, narrow band gap, and light emission wavelength in the near-infrared region. Show attractive application prospects, aroused strong attention. as I-III-VI 2 An important member of the family of semiconductor nanocrystals, AgInSe 2 Nanocrystals have a band gap of about 1.24eV, which is conducive to good applications in the fields of bioluminescent labeling, photocatalysis, and solar cells. However, due to the lack of effective general synthesis methods, they mainly focus on the research of bulk and thin film morphology. Until 2006, Vittal's research group (Meng T.Ng, Chris B.Boothroyd...

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Problems solved by technology

Since then, some other methods have been discovered for AgInSe 2 Synthesis of nanocrystals (e.g. (a) Dingsheng Wang, Wen Zheng, Chenhui Hao, Qing Peng, Yadong Li, Chem. Commun., 2008, 2556–2558; (b) Tianyu Bai, Chunguang Li, Feifei Li, Lan Zhao, Zhaorui Wang, He Huang, Cailing Chen, Yu Han, Zhan Shi, Shouhua Feng, Nanoscale, 2014, 6, 6782–6789; (c) Li Wang, Pengzhan Ying, Yuan Deng, Hong Zhou, Zhengliang Du, Jiaolin Cui, RSC Adv ., 2014, 4, 33897-33904 reported), but the above synthetic methods still have many deficiencies, first of all, these synthetic methods are all relatively loaded down with trivial details, and not environmental protection, what use mostly is poisonous solvent (such as oleylamine, three normal octylphosphine, etc.), secondly, these synthetic methods need to prepare complex single precursors, and the operation process is complicated. In addition, the nanocrystals prepared by these synthetic methods are all oil-soluble nanocrystals, which can only be dispersed in non-polar organic solvents. , such as n-hexane, toluene and other solvents, and when nanocrystals are applied in the fields of bioluminescent labeling, photocatalytic degradation of dyes or photocatalytic hydrogen production, nanocrystals that can be dispersed in the aqueous phase are obviously a better choice. That is, it is desirable that the nanocrystals used are water soluble

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