Preparation method of CuInS2 nanoparticles
A nanoparticle and solution technology, applied in the field of nanomaterials, achieves the effects of simple and unique method, simple synthesis steps, and avoiding physical methods
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[0030] Example 1
[0031] Weigh 1mmol copper chloride and dissolve it in 40ml DMF; then add 1mmol indium chloride to the above solution, stir to dissolve it; finally add 2.0mmol L-cysteine to the above mixed solution to make the copper source, The ratio of the amount of indium source to sulfur source is 1:1:2, and then 1.5mol / L ammonia water is added dropwise under constant stirring to adjust the pH of the solution to 8, to form a clear solution, and then transfer to a 50mL volume Teflon-lined autoclave is sealed and kept at a constant temperature of 200°C in a drying oven for 14 hours, and then naturally cooled to room temperature. The obtained product was washed several times with absolute ethanol and deionized water to remove soluble substances, and finally dried in a vacuum drying oven at 60° C. for 6 hours to obtain the product.
[0032] The chemical composition of the dried product was measured by X-ray photoelectron spectroscopy (XPS). The molar ratio of Cu:In:S reached 1...
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[0033] Example 2
[0034] Same as Example 1, but extended the constant temperature reaction time to 16h.
[0035] The product prepared under the same reaction conditions has a more complete morphology, a larger grain size, and a more obvious crystal phase under a transmission electron microscope. This is because in the case of a longer reaction time, the crystal nucleus can grow larger. At the same time, it shows that time has a great influence on the morphology of the product and the growth trend of crystal planes. The chemical composition of the dried product was measured by X-ray photoelectron spectroscopy (XPS), and the molar ratio of Cu:In:S was 1.02:1:1.95.
Example Embodiment
[0036] Example 3
[0037] Same as Example 1, but lowered the isothermal reaction temperature to 160°C.
[0038] The product prepared under the same conditions has been tested and found that its morphology and composition have not changed much, but the crystal phase has changed greatly. The chemical composition of the dried product is measured by X-ray photoelectron spectroscopy (XPS), Cu: In The molar ratio of :S is 1.0:1.04:1.98, indicating that CuInS 2 The crystalline phase of the crystal is very sensitive to the reaction temperature.
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