Exploring the variability of methylene blue´s surface-enhanced Raman scattering spectra – Impact of the experimental conditions (Plasmonic metal and excitation wavelength) and ongoing reactions (Reduction and photon-induced demethylation)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F25%3A00617462" target="_blank" >RIV/61388963:_____/25:00617462 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985882:_____/25:00617462 RIV/60461373:22340/25:43930423

Výsledek na webu

<a href="https://doi.org/10.1016/j.colsurfa.2025.136187" target="_blank" >https://doi.org/10.1016/j.colsurfa.2025.136187</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.colsurfa.2025.136187" target="_blank" >10.1016/j.colsurfa.2025.136187</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Exploring the variability of methylene blue´s surface-enhanced Raman scattering spectra – Impact of the experimental conditions (Plasmonic metal and excitation wavelength) and ongoing reactions (Reduction and photon-induced demethylation)

Popis výsledku v původním jazyce

This study investigates the behavior and transformations of methylene blue (MB) on various SERS-enhancing substrates (Au, Cu, and their composites) using four excitation wavelengths (532, 633, 785, and 1064 nm). The SERS spectra strongly depend on both the excitation wavelength and substrate. While the 532-nm excitation mainly induces electromagnetic enhancement, leading to similar SERS spectra across all substrates, chemical effects significantly influence spectra obtained with other wavelengths, producing substrate-specific responses. Due to MB's absorption band, photochemical transformations are likely with visible excitations. DFT analysis confirmed these reactions, identifying that one or two methyl groups are typically removed during MB demethylation. These findings are important for understanding SERS chemical enhancement and photochemical reactions, with potential implications for analytical applications. Monitoring reactions on plasmonic nanostructures is essential for ensuring reliable SERS results, considering analyte stability and enhancement mechanisms. Unlike studies using simple model probes, this work demonstrates the methodology's application potential with a more complex substance

Název v anglickém jazyce

Exploring the variability of methylene blue´s surface-enhanced Raman scattering spectra – Impact of the experimental conditions (Plasmonic metal and excitation wavelength) and ongoing reactions (Reduction and photon-induced demethylation)

Popis výsledku anglicky

This study investigates the behavior and transformations of methylene blue (MB) on various SERS-enhancing substrates (Au, Cu, and their composites) using four excitation wavelengths (532, 633, 785, and 1064 nm). The SERS spectra strongly depend on both the excitation wavelength and substrate. While the 532-nm excitation mainly induces electromagnetic enhancement, leading to similar SERS spectra across all substrates, chemical effects significantly influence spectra obtained with other wavelengths, producing substrate-specific responses. Due to MB's absorption band, photochemical transformations are likely with visible excitations. DFT analysis confirmed these reactions, identifying that one or two methyl groups are typically removed during MB demethylation. These findings are important for understanding SERS chemical enhancement and photochemical reactions, with potential implications for analytical applications. Monitoring reactions on plasmonic nanostructures is essential for ensuring reliable SERS results, considering analyte stability and enhancement mechanisms. Unlike studies using simple model probes, this work demonstrates the methodology's application potential with a more complex substance

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10406 - Analytical chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Colloids and Surfaces A-Physicochemical and Engineering Aspects

ISSN

0927-7757

e-ISSN

1873-4359

Svazek periodika

709

Číslo periodika v rámci svazku

part 2

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

136187

Kód UT WoS článku

001403609100001

EID výsledku v databázi Scopus

2-s2.0-85215134822