Chemical Strategies for Dendritic Magneto‐plasmonic Nanostructures Applied to Surface‐Enhanced Raman Spectroscopy. Issue 61 (1st October 2022)

• Record Type: Journal Article
• Authors: Fernandes, Tiago; Nogueira, Helena I. S.; Amorim, Carlos O.; Amaral, João S.; Daniel‐da‐Silva, Ana L.; Trindade, Tito
• Is Part Of: Chemistry. Volume 28:Issue 61(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-01
• Subjects: colloids -- dendrimers -- magneto-plasmonic -- nanoparticles -- Raman spectroscopy; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202202382
• Languages: English
• ISSNs: 0947-6539

Abstract

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 (Fe3 O4 : 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. Abstract : Towards ultrasensitive SERS analysis : Magneto‐plasmonic dendrimer‐based colloids have been explored for the adsorption and SERS detection of contaminants in water quality monitoring assisted by magnetic separation. Three chemical routes – crosslinking, chemical grafting, and layer‐by‐layer assembly – led to hybrid nanostructures with distinct potentialities.