when we do synthesis of nanoparticle through Green route, we always notice the initial color change by adding Plant Extract and the Salt like Zinc acetate in ZnO NPs etc. and if the color change occur we say our NPs synthesized. so what's the logic behind this, why the color change occurred.
The initial color change observed during the green synthesis of nanoparticles is primarily due to the surface plasmon resonance (SPR) phenomenon. SPR occurs when the collective oscillation of free electrons in nanoparticles interacts with the electromagnetic field of light. This interaction results in the absorption of specific wavelengths of light, leading to a change in the solution's color.
The specific color change observed depends on the type of nanoparticle being synthesized. For instance, silver nanoparticles typically exhibit a color change from pale yellow to brown, while gold nanoparticles exhibit a color change from pale red to deep red. This color change serves as a visual indication of the successful formation of nanoparticles.
In addition to SPR, other factors can also contribute to the initial color change. For example, the presence of plant extract components, such as flavonoids and phenolics, can also absorb light and contribute to the observed color change.
Overall, the initial color change observed during green synthesis of nanoparticles is a valuable indicator of the successful formation of nanoparticles. It provides a simple and non-invasive method for monitoring the synthesis process.
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