Sensitive ‘on the fiber’ detection of synthetic organic dyes by laser photoinduced plasmonic Ag nanoparticles

Abstract

The photoreduction of aqueous Ag+ to silver nanoparticles (AgNPs) on a substrate was studied aiming at the application of surface‐enhanced Raman scattering (SERS) technique to the sensitive analysis of organic colorants directly on artworks. In particular, the presence of the synthetic dyes methyl violet (BV1) and fuchsine (BV14), in both standard and historical wool fibers, was analyzed. Scanning electron microscopy was employed to study the morphology and distribution of the NPs obtained on the fiber. We have carried out an investigation of the influence of several factors on the morphology of NPs: excitation wavelength, substrate, laser power and laser irradiation time. The resulting materials were analyzed at different laser wavelengths in order to evaluate the application range of the probe laser after the NPs formation. SERS spectra of the BV1 and BV14 dyes on the fiber were obtained and compared with those obtained in suspended conventional AgNPs, in order to deduce the possible influence of the wool substrate on the Raman spectra. SERS spectra were analyzed considering the possible resonance Raman processes. Bands attributed to the protein substrate were also identified. The main goal of this work was to assess and optimize a general method of analysis of organic dyes on natural fibers based on the direct preparation of AgNPs by laser SERS technique. Copyright © 2017 John Wiley & Sons, Ltd.

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

“…Bonacini et al measured sensitive on‐the‐fiber SERS detection of synthetic organic dyes by laser photoinduced plasmonic Ag nanoparticles (AgNPs). The main goal of their work was to assess and optimize a general method of analysis of organic dyes on natural fibers based on the direct preparation of AgNPs by the SERS technique . Filgueiras et al described a SERS investigation of antimicrobial adsorption on silver nanoparticles as mediated by surface modifiers.…”

“…The main goal of their work was to assess and optimize a general method of analysis of organic dyes on natural fibers based on the direct preparation of AgNPs by the SERS technique. [92] Filgueiras et al described a SERS investigation of antimicrobial adsorption on silver nanoparticles as mediated by surface modifiers. The surface modifiers led to changes in the adsorption geometries of the molecules on the silver surfaces, which were rationalized on the basis of differences in the relative intensities of the bands assigned to the out-of-plane modes.…”

Fourier transform‐Raman and surface‐enhanced Raman spectroscopy analysis of safflower red‐dyed washi paper: pH study and bands assignment

“…The application of ordinary Raman spectroscopy for the characterization of this red dye is limited by the intense fluorescence of the dye and its low solubility in water. Surface‐enhanced Raman spectroscopy (SERS) has proven to be an invaluable tool for the detection and identification of organic substances such as dyes and drugs even in trace levels. Briefly, the adsorption of an organic molecule onto a nanostructured metallic surface results in an extremely significant enhancement of the Raman scattering, accompanied by a remarkable quenching of the fluorescence emission .…”

Raman, SERS, and DFT Analysis of the Main Alkaloids Contained in Syrian Rue

“…This leads to ultrahigh sensitivity compared to normal Raman and, therefore, to the possibility of analyzing minute samples successfully. In the past fifteen years, this technique has also seen increasing application in the cultural heritage field for the characterization of dyes and lake pigments derived from plants and insects or artificially synthesized in a chemical laboratory. − Scientific analysis of such materials is of great interest to art historians and curators, as information regarding their availability and use in certain time periods and geographical areas may offer insight into the lifestyle and technical knowledge reached by various populations in a given historical age, the trade routes, and commercial transactions involved in the creation of an object, as well as the interaction among different cultures. Revealing the nature and origin of dyes and pigments found in artworks may also provide clues as to their intended color and appearance, resulting in an improved understanding of the artist’s original intentions and choices.…”