Anais do Workshop INEO 2023

GOLD CONJUGATED-MAGNETIC NANOPARTICLES TOWARDS SURFACE-ENHANCED RAMAN SCATTERING (SERS) APPLICATION

Published in 12/12/2023 - ISBN: 978-65-272-0088-8

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Paper Title
GOLD CONJUGATED-MAGNETIC NANOPARTICLES TOWARDS SURFACE-ENHANCED RAMAN SCATTERING (SERS) APPLICATION
Authors
  • Celina Massumi Miyazaki
  • Cibely da Silva Martin Sonvesso
  • Carlos José leopoldo Constantino
  • Priscila Alessio
Modality
Pôster
Subject area
Síntese e caracterização de materiais
Publishing Date
12/12/2023
Country of Publishing
Brasil
Language of Publishing
Inglês
Paper Page
https://www.even3.com.br/anais/workshop-do-ineo-2023/613157-gold-conjugated-magnetic-nanoparticles-towards-surface-enhanced-raman-scattering-(sers)-application
ISBN
978-65-272-0088-8
Keywords
gold conjugated-magnetic nanoparticles, magnetic concentration, SERS, dopamine, methylparathion
Summary
One important challenge in the surface-enhanced Raman scattering (SERS) quantitative application is that variables such as uncontrolled colloid aggregation and natural motion of particles lead to variations in the molecular position and molecule-nanoparticle arrangements, influencing SERS magnitude. We have synthesized gold conjugated-magnetic nanoparticles (AuMNP) colloid as a SERS platform and investigated the improvement in the repeatability and reproducibility of the SERS measurements. Magnetite magnetic nanoparticles (MNP) were obtained by coprecipitation using phytic acid as a soft template. Following, gold nanoparticles (AuNP) were chemically reduced using sodium citrate in the remaining template sites. 10 nm-size AuNP anchored to MNP agglomerates (formed by MNP with 17 - 23 nm size) were detected in the scanning electron microscopy images. The SERS capacity of the AuMNP was tested using dopamine as a probe and a portable Raman spectrometer Bruker BRAVO, using a dual laser excitation with 785 and 853 nm wavelengths. Dispersion measurements were taken immediately after agitation, while the magnetically concentrated measurements were taken after keeping the vial for 2 minutes on a support housing a NdFeB magnet (20×4×2 mm). For the repeatability test (consecutive measurements taken in the same sample), the standard deviation (SD) of the band intensity at 634 cm-1 (assigned to the non-planar deformation of the catechol ring) was 368 and 34 (arb. un.) for the colloid and magnetically concentrated measurements, respectively. For the reproducibility test (sample-to-sample analysis), the SD was 358 and 21 (arb. un.) for the colloid and magnetically concentrated measurements, respectively. Additionally, we have investigated the modulation of the hot spots by the magnetic concentration of the AuMNP. While colloid samples do not provide SERS for methyl parathion in the micromolar range, we achieved a well-defined SERS signal for the magnetically concentrated samples. Although this work is still in progress, the results are encouraging for the development of a simple approach for SERS detection with high reproducibility, repeatability, and sensitivity. Acknowledgement: FAPESP (grant numbers 2020/11803-0, 2021/14235-6, 2017/15019-0, 2018/22214-6), CNPq, and INCT/INEO.
Title of the Event
Workshop do INEO 2023
City of the Event
Nazaré Paulista
Title of the Proceedings of the event
Anais do Workshop INEO 2023
Name of the Publisher
Even3
Means of Dissemination
Meio Digital

How to cite

MIYAZAKI, Celina Massumi et al.. GOLD CONJUGATED-MAGNETIC NANOPARTICLES TOWARDS SURFACE-ENHANCED RAMAN SCATTERING (SERS) APPLICATION.. In: Anais do workshop INEO 2023. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2023. Available in: https//www.even3.com.br/anais/workshop-do-ineo-2023/613157-GOLD-CONJUGATED-MAGNETIC-NANOPARTICLES-TOWARDS-SURFACE-ENHANCED-RAMAN-SCATTERING-(SERS)-APPLICATION. Access in: 14/05/2025

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