Guava seeds synthesized silver nanowires
Contents
Abstract
This experiment synthesis Ag-NWs with Psidium Guajava seed, Guava seeds contain some compounds, such as polyphenols and alkaloids, are likely able to reduce silver nitrate to silver and synthesis the silver nanoparticle to "wire-alike" or "flakes" shapes under certain conditions. However, although we obtained the orange solution (which indicate the existence of the silver nanoparticles), but the dried solution didn't exhibit any conductivity, and the SEM result also doesn't show the existence of nanowires. This maybe due to the absence of PVP, the caping agent and the insufficient UV exposure during the synthesis process.
Experiments
The experiment process is introduced below in the gallery. The process aims to repeat the result introduced in the paper "UV-Light Mediated Biosynthesis of Silver Nanowires; Characterization, Dye Degradation Potential and Kinetic Studies". The first attempt was made in BioClub Tokyo. Additionally, 3 groups of mixtures with different concentration of guava seed extraction was prepared: 1. silver nitrate solution mixed with distilled water, 2. silver nitrate solution mixed with guava seed extraction heat stirred for 50 mins, 3. silver nitrate solution mixed with guava seed extraction heat stirred for 4 hours. All beakers are put under UV exposure for 4 hours, the color of the second and 3rd mixture were changed from milky white to orange. The orange solution and the aggregations were collected separately, but only the solution was examined by the UV-vis spectrum in Tokyo.
Analyzings
The UV-vis spectrum comparism
The result of UV-Vis spectrum data can be downloaded here.
SEM photography
Two samples were prepared, the first one is the final solution drop dried on glass, the second is the aggregations collected from the centrifuged final solution. There's no sign shows the existence of the wire-alike shape, indicating the failure of the nano wire synthesis with guava seeds extraction. Only "flake-alike" shape was found in the sample.
Preferences
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