MICROWAVE-ASSISTED GREEN SYNTHESIS OF SILVER NANOPARTICLES USING SEMINYAK LEAF EXTRACT
Silver nanoparticles (AgNPs) are nanomaterials with properties such as very high antibacterial activity as well as excellent thermal and electrical conductivity and are being widely applied in various fields such as biomedical, sensors, and catalysts. Conventional methods that are still used today u...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/55039 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Silver nanoparticles (AgNPs) are nanomaterials with properties such as very high antibacterial activity as well as excellent thermal and electrical conductivity and are being widely applied in various fields such as biomedical, sensors, and catalysts. Conventional methods that are still used today use hazardous chemicals that have the potential to cause environmental pollution and toxicity to the body. In this study, the synthesis of AgNPs was carried out using an environmentally friendly green synthesis method by utilizing seminyak leaf extract as a reducing agent as well as a capping agent to prevent agglomeration. The synthesis process is also assisted by adding microwave irradiation to speed up the synthesis process and form more homogeneous particles. The concentration of seminyak leaf extract, AgNO3 precursor, and microwave irradiation time were varied in order to obtain optimization of the AgNPs synthesis process with extract variations of 1 and 2 wt %, variations of AgNO3 in the form of 1, 10, and 100 mM, and variations in microwave irradiation time in the form of 1, 3, and 5 minutes. Characterizations carried out in this study include Fourier Transformation Infra Red (FTIR), UV-Vis spectrophotometry, X-ray Diffraction (XRD), and Transmission Electron Microscopy (TEM). The FTIR results showed the presence of hydroxyl, carboxylate, and amine I functional groups which indicated the content of flavonoids, alkaloids, and polyphenols that act as reducing agents to form AgNPs. The UV-Vis results showed absorbance peaks at wavelengths of 483, 486, 497, and 528 nm which are characteristic of surface plasmon resonance of AgNPs. XRD data analysis showed a very high crystallinity of the Ag phase but the remaining AgNO3 phase indicated the limited reducing agent in the extract. The morphology of AgNPs seen using TEM showed an average particle size of 17.8 ± 7.6 nm with a spherical shape that was well dispersed in samples with a concentration of 100 mM AgNO3 and 2 wt% extract which was irradiated by microwave for 1 minute. Based on the results obtained, the use of seminyak leaf extract as a reducing agent as well as a capping agent in the AgNPs synthesis process has promising potential to be applied in various fields and produced on a large scale.
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