Guava seeds synthesized silver nanowires

Abstract

diagram of how to synthesis AgNW by the extraction of guava seed.

This experiment is composed with two existed paper, one is to synthesis AgNW 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 AgNW, a local Japanese toy kit "RISO PRINT GOCCO LAMP" is used to replace the IPL (intense pulsed light) in the original paper. The sintered AgNW is formed on glass and then be transferred to a PVB film.

Experiment

Part I, the synthesis of AgNW by guava seed

3 beakers of mixtures of silver nitrate and guava seed extraction were created with different concentration of guava seed extraction, 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 black material floating on the final solution was collected by dropper and store in test tube.

1. Preparation of the guava seed. The guava seed was collected from one Taiwanese guava by hand, then it is dried in an oven under 50ºC for 48 hours and powdered by a pharmacy pestle.
2. Mix 0.1g of the guava seed powder with 100ml distilled water, and it's stirred under 40ºC for 5 hours. Filter out the seeds from the extraction solution.
3. Prepare 1M silver nitrate solution by dissolving 1.7 grams of silver nitrate in 100 ml of distilled water.
4. Mix the silver nitrate solution and extraction of Taiwan guava seed under the ratio of 2:1.
5. Put the mixed solution under UV exposure for 4 hours, the beakers are sealed with cling film.
6. Collect the AgNW solution.

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Part II, Gacco Lamp Sintered AgNW PVM film

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.

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Preferences

1. Faisal Ali, Zahid Ali, Umer Younas, Awais Ahmad,* , Ghulam Mooin-ud-din, Muhammad Pervaiz, Rafael Luque,* , Ikram Ahmad, Adnan Ashraf, Munirah D. Albaqami, Aboud Ahmed Awadh Bahajjaj and Muhammad Waqas Ishaq. (2021). UV-Light Mediated Biosynthesis of Silver Nanowires; Characterization, Dye Degradation Potential and Kinetic Studies
2. Dong Jun Lee1, Youngsu Oh, Jae-Min Hong, Young Wook Park & Byeong-Kwon Ju1. (2018). Light sintering of ultra-smooth and robust silver nanowire networks embedded in poly(vinyl-butyral) for flexible OLED. DOI:10.1038/s41598-018-32590-0