Copper nanoparticles have attracted a lot of interest in recent years due to their interesting properties, low-cost preparation, and many potential applications in catalysis, cooling fluids, or conductive inks. In this study, copper nanoparticles were synthesized by chemical reduction of copper sulfate CuSO4 and sodium borohydride NaBH ₄ in water without inert gas protection. In our synthetic route, ascorbic acid (natural vitamin C) is used as a protective agent to prevent newly formed Cu nanoparticles from being oxidized during the synthesis and storage processes. Add polyethylene glycol (PEG) and use it as a size control agent and capping agent. Characterization of Cu nanoparticles by Fourier transform infrared (FT-IR) spectroscopy to investigate the coordination between Cu nanoparticles and PEG. Transmission electron microscopy (TEM) and ultraviolet visible spectroscopy are helpful for analyzing the size and optical properties of nanoparticles, respectively. The average crystal size of particles at room temperature is less than 10 nm.
It has been observed that the surface plasmon resonance phenomenon can be controlled during the synthesis process by changing the reaction time, pH value, and the relative ratio of copper sulfate to surfactant. The surface plasmon resonance peak shifted from 561 nm to 572 nm, and the apparent color changed from red to black, which is related to the change in particle size. After oxidation, the color of the solution changes from red to purple, eventually resulting in a blue solution. The average crystal size of particles at room temperature is less than 10 nm. It has been observed that surface plasmon resonance can be controlled during the synthesis process by changing the reaction time, pH value, and the relative ratio of copper sulfate to surfactant. The surface plasmon resonance peak shifted from 561 nm to 572 nm, and the apparent color changed from red to black, which is related to the change in particle size. After oxidation, the color of the solution changes from red to purple, eventually resulting in a blue solution. The average crystal size of particles at room temperature is less than 10 nm. It has been observed that surface plasmon resonance can be controlled during the synthesis process by changing the reaction time, pH value, and the relative ratio of copper sulfate to surfactant. The surface plasmon resonance peak shifted from 561 nm to 572 nm, and the apparent color changed from red to black, which is related to the change in particle size. After oxidation, the color of the solution changes from red to purple, eventually resulting in a blue solution. And the apparent color changes from red to black, partly due to the change in particle size. After oxidation, the color of the solution changes from red to purple, eventually resulting in a blue solution. And the apparent color changes from red to black, partly due to the change in particle size. After oxidation, the color of the solution changes from red to purple, eventually resulting in a blue solution.
Chemical method is the use of some reducing agents to reduce silver ions or copper ions to obtain small-sized nano silver and nano copper. This method does not require high equipment requirements (no specific equipment is needed), so it has the advantages of low cost, uncomplicated process route, and simple operation method. Moreover, chemical method can effectively control the particle size and morphology of nano copper or nano silver by changing reaction conditions, such as reaction temperature, reaction time, reactant concentration, etc. Therefore, it has been widely used in basic research and industrial production. In the process of synthesizing nano copper and nano silver, strong reducing agents such as hydrazine hydrate and sodium borohydride are often used to prepare nano silver and nano copper, but these commonly used reducing agents have the advantages of... Due to its certain toxicity, it may sometimes cause environmental pollution, The application of the prepared nano silver and nano copper is limited. Therefore, finding suitable non-toxic reducing agents to prepare small-sized nano silver and nano copper has become one of the key technologies. In the process of preparing nano silver and nano copper, in order to reduce the aggregation of precious metal nanomaterials, some high molecular weight materials are used to protect nano silver and nano copper. Long chain fatty acids, polyvinylpyrrolidone (PVP), ammonium polyacrylate, starch, etc. have been reported to be able to prepare nano silver or nano copper powders well. However, in the synthesis of nano copper and nano silver, the preparation of nano silver and nano copper with excellent performance, controllable particle size and uniform distribution still faces great difficulties.
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