Difference between revisions of "Guava seeds synthesized silver nanowires"
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<gallery mode="traditional" class="center" widths=360px heights=240px caption="step by step process"> | <gallery mode="traditional" class="center" widths=360px heights=240px caption="step by step process"> | ||
| − | File:Seed of Taiwan guava.jpg|The | + | File:Seed of Taiwan guava.jpg|The seeds was extracted from guava purchased in Taiwan. |
| − | File:Powdered Taiwan guava seeds with pestle.jpg|The seeds was firstly dried in oven at 50ºC for 48 hours and powdered by grinder pestle. | + | File:Powdered Taiwan guava seeds with pestle.jpg|The seeds was firstly dried in oven at 50ºC for 48 hours and then powdered by grinder pestle without filtering. |
| − | File:preparation of the extraction of Taiwan guava seed.jpeg|Mix 0.1g of the guava seed powder with 100ml distilled water, and it's stirred | + | File:preparation of the extraction of Taiwan guava seed.jpeg|Mix 0.1g of the guava seed powder with 100ml distilled water, and it's stirred with heat stirrer at 40ºC for 50 minutes. |
| − | File:silver nitrate solution .jpg|Prepare 1mM silver nitrate solution by dissolving 1.7 grams of silver nitrate in 100 ml of distilled water. | + | File:silver nitrate solution .jpg|Prepare 1mM silver nitrate solution by dissolving 1.7 grams of silver nitrate crystals in 100 ml of distilled water. Stir it in room temperature until the solution turns clear. |
| − | File:silver nitrate solution with guava extraction before UV.jpeg|Mix the silver nitrate solution and extraction | + | File:silver nitrate solution with guava extraction before UV.jpeg|Mix the silver nitrate solution and guava extraction by the ratio of 2:1. |
| − | File:silver nitrate solution with guava extraction during UV.jpeg| | + | File:silver nitrate solution with guava extraction during UV.jpeg|The mixed solution was put into an UV chamber and was exposure for 4 hours in room temperature. All beakers are sealed with cling film. |
| − | File:silver nitrate solution with guava extraction after UV.jpeg|The color | + | File:silver nitrate solution with guava extraction after UV.jpeg|The change of the color of the final solutions after UV exposure. |
| − | File:final solution of AgNWs synthesis with Taiwan guava seeds.jpeg|The solution was filtered with filter paper. | + | File:final solution of AgNWs synthesis with Taiwan guava seeds.jpeg|The final solution was filtered with filter paper and the color is in orange. |
</gallery> | </gallery> | ||
Revision as of 14:36, 21 October 2023
Contents
Part I, bio synthesis of the Ag-NW
This experiment is composed with two existed paper, one is to synthesis AgNWs with Psidium Guajava seed, and the other one is to synthesis transparent conductive layer by transferring AgNWs which are light sintered by Riso print Gocco lamps. Guava seeds contain some compounds, such as polyphenols and alkaloids, which can reduce silver nitrate under certain conditions, thereby promoting the growth and stability of silver nanowires. These compounds acted as reducing agents and stabilizers during the preparation process, thus enabling a green synthesis method without external stabilizers. For the light sintering of AgNWs, a local Japanese toy kit "RISO PRINT GOCCO LAMP" is used to replace the IPL (intense pulsed light) in the original paper. The sintered AgNWs is formed on glass and then be transferred to a PVB film.
diagram of how to synthesis AgNWs by the extraction of guava seed.
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.
- step by step process
The seeds was extracted from guava purchased in Taiwan.
The seeds was firstly dried in oven at 50ºC for 48 hours and then powdered by grinder pestle without filtering.
Mix 0.1g of the guava seed powder with 100ml distilled water, and it's stirred with heat stirrer at 40ºC for 50 minutes.
Prepare 1mM silver nitrate solution by dissolving 1.7 grams of silver nitrate crystals in 100 ml of distilled water. Stir it in room temperature until the solution turns clear.
Mix the silver nitrate solution and guava extraction by the ratio of 2:1.
The mixed solution was put into an UV chamber and was exposure for 4 hours in room temperature. All beakers are sealed with cling film.
The change of the color of the final solutions after UV exposure.
The final solution was filtered with filter paper and the color is in orange.
- UV-vis spectrum result
UV-vis analytic chart was made and supported by Shohei Asami, member BioClub Tokyo.
UV-vis graphs of the orange final solution and clear final solution.
UV-Vis graphs of P. Guajava extraction and Ag-NWs from the paper.
The Ultraviolet–visible spectroscopy test was supported by Shohei Asami, member of Bioclub.
UV-Vis spectra of Ag-NWs synthesis with Taiwan guava seeds, datais provided by Shohei Asami. The result match up the graph in the paper, but it's overall lower, it might due to its lower density.
SEM result
The scanning electron microscopy is kindly supported by Joakim Reuteler in ETH Zurich. 2 samples of guava seeds synthesised AgNWs were prepared, one is AgNW solution dried on glass, the other one is aggregation collected from the solution. However we didn't find any wire-alike shape, indicating the failure of the nano wire synthesis.
Part II, Gacco Lamp Sintered AgNWs PVM film
Continued with the first part, in the original paper, the AgNWs is sintered by IPL (intense pulsed light) but due to the high price of IPL, I decided to try something else. I found a type of light bulb that generate sudden high heat in a Japanese toy kit RISO PRINT GOCCO LAMP which is introduced by the founder of Bioclub, Georg Tremmel. The original purpose of the bulb is to create mask for riso print. The original usage please visit RISO PRINT GOCCO LAMP tutorial. The follow on practices is documented in page Conductive thin coating made of AgNWs.
A conductive, uniform, and ultra-smooth flexible transparent composite film is produced by embedding silver nanowires (AgNWs) into poly(vinyl-butyral) (PVB) without pressure or high-temperature annealing.
Preferences
- Ali, Faisal, Zahid Ali, Umer Younas, Awais Ahmad, Ghulam Mooin Ud Din, Muhammad Pervaiz, Rafael Luque, et al. 2021. “UV-Light Mediated Biosynthesis of Silver Nanowires; Characterization, Dye Degradation Potential and Kinetic Studies.” Sustainability 13 (November): 13220. https://doi.org/10.3390/su132313220.
- 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.
- 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.
- 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.
- Lee, Dong Jun, Youngsu Oh, Jae-Min Hong, Young Wook Park, and Byeong-Kwon Ju. 2018. “Light Sintering of Ultra-Smooth and Robust Silver Nanowire Networks Embedded in Poly(Vinyl-Butyral) for Flexible OLED.” Scientific Reports 8 (1): 14170. https://doi.org/10.1038/s41598-018-32590-0.
- 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.
