As in different research papers in literature it is mentioned that you will get white powder means NPs as the end product but I have black color as the end product.
In nanoparticle synthesis, the color of the nanoparticles can be influenced by various factors, including their size, shape, and composition. When synthesizing zinc oxide nanoparticles through a green synthesis method using zinc nitrate, the color of the nanoparticles can depend on the specific conditions and the type of stabilizing agents or reducing agents used in the process.
Zinc oxide nanoparticles can exhibit various colors, including white, yellow, and even slightly greenish hues. The color change is often attributed to the quantum size effect, which occurs when particles are in the nanometer size range. As the size of the nanoparticles decreases, their electronic and optical properties can change, resulting in different colors.
In the context of green synthesis, which typically involves using natural sources or environmentally friendly methods to synthesize nanoparticles, the choice of color can depend on the plant or biological material used as a reducing or stabilizing agent. For instance, if the green synthesis method involves the use of plant extracts rich in certain phytochemicals, these compounds can interact with the zinc ions and influence the color of the resulting nanoparticles.
So, the color of the synthesized zinc oxide nanoparticles may not always be a deliberate choice, but rather a result of the interplay between the nanoparticle properties and the specific synthesis conditions. If you have a specific experiment in mind, it's important to carefully document your synthesis conditions and observe the properties of the nanoparticles to understand the factors influencing their color.
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