Magnetite-Supported Gold Nanostars for the Uptake and SERS Detection of Tetracycline
authors Pinheiro, PC; Fateixa, S; Nogueira, HIS; Trindade, T
nationality International
journal NANOMATERIALS
author keywords Au nanostars; magnetite nanoparticles; water pollutants; SERS; antibiotics
keywords ENHANCED RAMAN-SPECTROSCOPY; SENSITIVE DETECTION; ANTIBIOTIC-RESIDUES; NANOPARTICLES; SILVER; SCATTERING; OXYTETRACYCLINE; ADSORPTION; ENRICHMENT; SEPARATION
abstract Magnetite nanoparticles (MNPs) decorated with gold nanostars (AuNSs) have been prepared by using a seed growth method without the addition of surfactants or colloidal stabilizers. The hybrid nanomaterials were investigated as adsorbents for the uptake of tetracycline (TC) from aqueous solutions and subsequent detection using surface-enhanced Raman scattering (SERS). Several parameters were investigated in order to optimize the performance of these hybrid platforms on the uptake and SERS detection of TC, including variable pH values and the effect of contact time on the removal of TC. The spatial distribution of TC and AuNS on the hybrid composites was accomplished by coupling SERS analysis with Raman imaging studies, allowing also for the determination of the detection limit for TC when dissolved in ultrapure water (10 nM) and in more complex aqueous matrices (1 mu M). Attempts were also made to investigate the adsorption modes of the TC molecules at the surface of the metal NPs by taking into account the enhancement of the Raman bands in these different matrices.
publisher MDPI
issn 2079-4991
year published 2019
volume 9
issue 1
digital object identifier (doi) 10.3390/nano9010031
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000459737200031
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journal analysis (jcr 2017):
journal impact factor 3.504
5 year journal impact factor 3.811
category normalized journal impact factor percentile 66.708
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