Method for synthesizing cobalt diselenide nanocrystal in polyalcohol-base solution

Abstract

The invention discloses a method for synthesizing a cobalt diselenide nanocrystal in a polyalcohol-base solution, which comprises the following steps: (1) weighing 0.25mmol of cobalt chloride, and dissolving in 10ml of triethylene glycol to obtain a cobalt precursor cation source solution; adding 40ml of triethylene glycol into a three-neck flask, adding selenium powder, and adding 0.1g of polyvinylpyrrolidone to obtain an anion source solution, wherein the Co/Se mol ratio is respectively 1:2, 1:1.9, 1:1.8, 1:1.7, 1:1.5 and 1:1; and (2) slowly heating the anion solution to 210-270 DEG C while quickly injecting the cation source solution, and reacting under reflux to synthesize the CoSe2 nanocrystal solution. The method has the advantages of mild reaction conditions, high safety, low toxicity, low cost, single and stable product phase and favorable repetitiveness, and is simple to operate; and the stoichiometric proportion and material feeding have favorable consistency.

Description

technical field [0001] The present invention relates to nanomaterials, in particular to a method for synthesizing CoSe in polyol-based solutions 2 nanocrystal approach. Background technique [0002] Cobalt diselenide (CoSe 2 ) As a kind of transition metal chalcogenides, it usually exists in two forms: pyrite (cubic crystal structure) and marcasite (orthorhombic crystal structure). CoSe 2 It is a narrow bandgap semiconductor material with a high optical absorption coefficient. It is a Pauli paramagnetic substance in the ground state, and exhibits short-lived local magnetism at high temperatures (see Noue, I.et.al., Solid State Commun. , 1979, 30, 341). Because of its unique structure and magnetic, electrical, and optical properties, it has been widely used in many fields such as magnetic semiconductors, thermoelectric devices, superconductors, sensors, etc., and its development advantages and potential in the photovoltaic industry are particularly huge. [0003] At pres...

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Problems solved by technology

[0004] The object of the present invention is to overcome the shortcomings of the prior art, such as time-consuming, energy-consuming, high cost, complicated operation, unfavorable for large-scale production, difficult control of chemical components, and high toxicity of commonly used solvents. For the first time, liquid-phase chemical synthesis is adopted The hot injection method of the method provides a CoSe with mild reaction conditions, which is beneficial to ensure the purity of the product, the stoichiometric ratio is controllable, green, non-toxic, and low in cost. 2 Preparation methods of nanocrystals

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