Guava seeds synthesized silver nanowires

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Abstract

Diagram of the experiment from the paper "UV-Light Mediated Biosynthesis of Silver Nanowires; Characterization, Dye Degradation Potential and Kinetic Studies".
The growing mechanism of Ag-NW and the role of PVP as caping agent. Picture from "A Simple Synthetic Approach To Prepare Silver Elongated Nanostructures: From Nanorods to Nanowires".
BioClub Tokyo open lab day on Tuesday and its founder Georg Tremmel.
Urs and Miranda in Gaudilabs to repeat the Guava seeds synthesized Ag-NWs experiment.

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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  2. Lv, Pengfei, Huimin Zhou, Min Zhao, Dawei Li, Keyu Lu, Di Wang, Jieyu Huang, Yibing Cai, Lucian Amerigo Lucia, and Qufu Wei. 2018. “Highly Flexible, Transparent, and Conductive Silver Nanowire-Attached Bacterial Cellulose Conductors.” Cellulose 25 (6): 3189–96. https://doi.org/10.1007/s10570-018-1773-8.
  3. Ferraro, Giovanni, and Emiliano Fratini. 2019. “A Simple Synthetic Approach To Prepare Silver Elongated Nanostructures: From Nanorods to Nanowires.” Journal of Chemical Education 96 (3): 553–57. https://doi.org/10.1021/acs.jchemed.8b00628.
  4. Padhi, Santwana, and Anindita Behera. 2022. “Chapter 17 - Biosynthesis of Silver Nanoparticles: Synthesis, Mechanism, and Characterization.” In Agri-Waste and Microbes for Production of Sustainable Nanomaterials, edited by Kamel A. Abd-Elsalam, Rajiv Periakaruppan, and S. Rajeshkumar, 397–440. Nanobiotechnology for Plant Protection. Elsevier. https://doi.org/10.1016/B978-0-12-823575-1.00008-1.
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  6. Jin, Hwa-Young, Jae-Yup Kim, Jin Ah Lee, Kwangsoo Lee, Kicheon Yoo, Doh-Kwon Lee, BongSoo Kim, et al. 2014. “Rapid Sintering of TiO2 Photoelectrodes Using Intense Pulsed White Light for Flexible Dye-Sensitized Solar Cells.” Applied Physics Letters 104 (14): 143902. https://doi.org/10.1063/1.4871370.
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