Chemical Strategies for Dendritic Magneto‐plasmonic Nanostructures Applied to Surface‐Enhanced Raman Spectroscopy

Abstract

Chemical analyses in the field using surface‐enhanced Raman scattering (SERS) protocols are expected to be part of several analytical procedures applied to water quality monitoring. To date, these endeavors have been supported by developments in SERS substrate nanofabrication, instrumentation portability, and the internet of things. Here, we report distinct chemical strategies for preparing magneto‐plasmonic (Fe3O4 : Au) colloids, which are relevant in the context of trace‐level detection of water contaminants due to their inherent multifunctionality. The main objective of this research is to investigate the role of poly(amidoamine) dendrimers (PAMAMs) in the preparation of SERS substrates integrating both functionalities into single nanostructures. Three chemical routes were investigated to design magneto‐plasmonic nanostructures that translate into different ways for assessing SERS detection by using distinct interfaces. Hence, a series of magneto‐plasmonic colloids have been characterized and then assessed for their SERS activity by using a model pesticide (thiram) dissolved in aqueous samples.

Magnetic Hyperthermia Therapy for High-Grade Glioma: A State-of-the-Art Review

“…However, it has been shown that interactions between silica and the MNP surface may result in a reduction in saturation magnetization by 32%, thus decreasing heating efficiency [ 41 ]. This effect may be variable, as others have recently demonstrated that silica coating may reduce saturation magnetization by as low as 8% and may even result in an increase of as much as 14% [ 42 ]. Similarly, organic compounds such as PEG, which are used to reduce non-specific interactions between MNPs and proteins, may affect MNP geometry and therefore their magnetic properties [ 43 , 44 ].…”