研究目的
To synthesize a Cu-based infinite coordination polymer using a salen-type ligand and use it as a precursor to produce CuO nanoparticles with a larger band gap than bulk CuO.
研究成果
The precipitation method successfully produced an amorphous Cu-based ICP with spherical nanoparticles of ~60 nm diameter. Thermal decomposition of this ICP yielded CuO nanoparticles with a band gap of 2.10 eV, larger than bulk CuO (1.85 eV), due to quantum confinement effects. The organic linker in the ICP aids in controlling the growth of CuO.
研究不足
The ICP particles are amorphous, which prevents the use of X-ray crystallography for exact structural determination. The CuO nanoparticles are agglomerated, and the method may not control size and morphology precisely.
1：Experimental Design and Method Selection:
The study involved synthesizing an infinite coordination polymer (ICP) through precipitation/polymerization at room temperature using a carboxylic acid-functionalized salen-based ligand (CFSL) and copper acetate in methanol. The ICP was then calcined to produce CuO nanoparticles.
2：Sample Selection and Data Sources:
The ligand CFSL was synthesized as per supporting information. Copper acetate dihydrate was used as the metal source.
3：List of Experimental Equipment and Materials:
Methanol, Cu(OAc)2·2H2O, CFSL ligand, furnace for calcination. Specific instruments include FT-IR spectrometer, SEM, TEM, XRD, and UV-Vis spectrophotometer for characterization.
4：Experimental Procedures and Operational Workflow:
A methanolic solution of Cu(OAc)2·2H2O was added to a methanolic solution of CFSL, leading to precipitation. The precipitate was centrifuged, washed, and dried. The ICP was calcined at 500°C for 6 hours to obtain CuO nanoparticles.
5：Data Analysis Methods:
Elemental analysis, FT-IR spectroscopy, XRD, SEM, TEM, and UV-Vis spectroscopy with Tauc plot analysis were used to characterize the materials and determine the band gap.
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