Influencia De Los Parámetros De Síntesis En Las Propiedades Morfológicas De Nanopartículas De Plata Y Su Correlación Con La Resonancia Superficial Del Plasmón
Silver nanoparticles (AgNPs) are synthesized by two methods. In the first method, a mixture of NaBH4 (reductant) and sodium citrate (dispersant) is added dropwise in 0.93 mM AgNO3 solution (precursor), while, in the second method, the reductant was added dropwise to the precursor-dispersant mixture....
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| Format: | Tesis/Trabajo de grado - Monografía - Pregrado |
| Language: | Español |
| Published: |
Universidad Antonio Nariño
2024
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| Subjects: | |
| Online Access: | https://repositorio.uan.edu.co/handle/123456789/11842 |
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| Summary: | Silver nanoparticles (AgNPs) are synthesized by two methods. In the first
method, a mixture of NaBH4 (reductant) and sodium citrate (dispersant) is added
dropwise in 0.93 mM AgNO3 solution (precursor), while, in the second method,
the reductant was added dropwise to the precursor-dispersant mixture. In this
regard, the effect of pH on the synthesis was investigated, different media were
used: water (control), citrate buffer pH 4.0, 20 mM, phosphate buffer pH 7.0, 20
mM and ammonium buffer pH 10.0, 20 mM. Finding at pH 10.0 a shift of
approximately 20 nm in the surface plasmon resonance compared to the control,
in parallel at pH 4.0 and 7.0 no shift was observed. Using the control medium,
the effect of pressure at 1.7 MPa and temperature of 200°C was evaluated for 4,
8 and 27 hours. A shift of approximately 20 nm was observed at all time
conditions studied. The findings obtained in this study suggest that both pH
alkalinity and the application of elevated pressure exert a significant impact on
the morphology of silver nanoparticles (AgNPs). |
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