Characterization of 11-mercaptoundecanoic and 3-mercaptopropionic acids adsorbed on silver by surface-enhanced Raman scattering

Marques, Flávia C.; Oliveira, Gabriela P.; Teixeira, Raïssa A.R.; Justo, Rodrigo M. S.; Neves, Tatiana B. V.; Andrade, Gustavo F. S.

doi:10.1016/j.vibspec.2018.07.015

Cited by 34 publications

(15 citation statements)

References 27 publications

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“…The band centred at~920 cm −1 is due to the stretching of the C-COO group when it is deprotonated 34 . The presence of a band at 630 cm −1 , as well as the absence of a band in the region of~700 cm −1 , is associated with the gauche conformer of the S-C-C bond 35 , whereas the doublet in the 400 cm −1 region is likely due to C-C-O bonding 34 . The absence of a strong signal from 750 to 780 cm −1 , the C-N + stretching region of ethyltrimethylammonium bromide, strongly suggests the absence of synthesis residues on the gold plate 36 .…”

Section: Resultsmentioning

confidence: 98%

Direct molecular-level near-field plasmon and temperature assessment in a single plasmonic hotspot

Richard‐Lacroix

Deckert

2020

Light Sci Appl

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Tip-enhanced Raman spectroscopy (TERS) is currently widely recognized as an essential but still emergent technique for exploring the nanoscale. However, our lack of comprehension of crucial parameters still limits its potential as a user-friendly analytical tool. The tip's surface plasmon resonance, heating due to near-field temperature rise, and spatial resolution are undoubtedly three challenging experimental parameters to unravel. However, they are also the most fundamentally relevant parameters to explore, because they ultimately influence the state of the investigated molecule and consequently the probed signal. Here we propose a straightforward and purely experimental method to access quantitative information of the plasmon resonance and near-field temperature experienced exclusively by the molecules directly contributing to the TERS signal. The detailed near-field optical response, both at the molecular level and as a function of time, is evaluated using standard TERS experimental equipment by simultaneously probing the Stokes and anti-Stokes spectral intensities. Self-assembled 16-mercaptohexadodecanoic acid monolayers covalently bond to an ultra-flat gold surface were used as a demonstrator. Observation of blinking lines in the spectra also provides crucial information on the lateral resolution and indication of atomic-scale thermally induced morphological changes of the tip during the experiment. This study provides access to unprecedented molecular-level information on physical parameters that crucially affect experiments under TERS conditions. The study thereby improves the usability of TERS in day-today operation. The obtained information is of central importance for any experimental plasmonic investigation and for the application of TERS in the field of nanoscale thermometry.

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Section: Resultsmentioning

confidence: 98%

Direct molecular-level near-field plasmon and temperature assessment in a single plasmonic hotspot

Richard‐Lacroix

Deckert

2020

Light Sci Appl

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“…This band was not observed in the SERS spectrum of MPA–NPs, suggesting the binding of a thiol group to the silver. Another important information is the shift of the bands located at 672 cm −1 and 766 cm −1 to 661 cm −1 and 739 cm −1 , respectively, which is another well-documented proof of the MPA–Ag interaction [14,15]. These bands are assigned to C1–C2 vibrations of gauche and trans conformations of the MPA molecule.…”

Section: Resultsmentioning

confidence: 99%

“…The spectrum of MPA–NPs is dominated by 935 cm −1 , 1294 cm −1 , and 1415 cm −1 assigned to υ(C-COO), υ(CO)+ δ(OH), and υ(CO) + δ(OH)+, respectively. The detailed assignment of all the MPA–NPs and MPA bands is nicely overviewed elsewhere [15]. Interestingly, since the MPA fully saturated the Ag–NPs surface (thus replacing stabilizing citrates), no interferences by the citrate molecules were recognized in the SERS spectrum.…”

Section: Resultsmentioning

confidence: 99%

Bi-Ligand Modification of Nanoparticles: An Effective Tool for Surface-Enhanced Raman Spectrometry in Salinated Environments

2019

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Elimination of massive aggregation of nanoparticles in the sample of high ionic strength is a prerequisite for the sensitive analysis through a surface-enhanced Raman spectrometry (SERS). We present a system of silver colloid modification composed of two thiolated modifiers (3-mercaptopropionic acid and thiolated polyethylene glycol) both creating a strong Ag-S bond. At their optimal molar ratio, the polymer acts as a steric barrier preventing direct nanoparticle–nanoparticle interaction, while the low-molecular organic acid creates areas accessible for the analyte molecules. Thus, this approach is an excellent tool for sustaining both the colloidal stability and SERS sensitivity. The functionality of the system was demonstrated on the SERS analysis of myoglobin from a saline solution. The favorable creation of hot spots was achieved by laser-induced sintering.

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“…Moreover, studies suggested that after TBA adsorption on AgNPs’ surface, TBA’s functional groups might interact with several proteins residues [21]. Conversely, MUA is likely to adsorb to AgNPs’ surface through the thiol (-SH) or the carboxylate group (−COO−) [23]. AgNPs that are coated with MUA residues could thus become more hydrophilic than naked AgNPs [24].…”

Section: Discussionmentioning

confidence: 99%

“…The decrease in cells viability might be connected with a synergistic effect of ICR-191 and AgNP-MUA nanoparticles. AgNP-MUA has a described tendency to aggregate, which might lead to the increased toxicity, explained by clouding of the cell membranes, and thereby facilitates ICR-191 activity [23,24,41]. Many cells lines that interact with AgNPs have been cultured and studied so far, including red blood cells, L929 fibroblasts, RAW 264.7 murine macrophages, L5178Y lymphoma cells, BRL3A rat liver cells, PC-12 pheochromocytoma-derived cell neuroendocrine cells, GSCs germ line stem cells, RBE4 rat brain endothelial cells, MCF-7 human breast adenocarcinoma cells, HepG2 human liver cells, BEAS-2B human bronchial epithelial cells, A4549 lung alveolar epithelial cells, and hMSC (human mesenchymal stem cells).…”

Section: Discussionmentioning

confidence: 99%

The Impact of Surface Functionalization on the Biophysical Properties of Silver Nanoparticles

et al. 2019

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Among metal-based nanoparticles, silver nanoparticles (AgNPs) are particularly appealing because of their stability, functionality, and documented antimicrobial properties. AgNPs also offer the possibility of different surface modifications. In this work, we functionalized AgNPs with thiobarbituric acid or 11-mercaptoundecanoic acid residues to improve the nanoparticles’ biological activities. Subsequently, we assessed the physicochemical properties of newly synthesized AgNPs using a wide range of biophysical methodologies, including UV/vis and fluorescence spectroscopy, atomic force and scanning electron microscopy, and dynamic light scattering and isothermal titration calorimetry. Next, we examined the effect of nanoparticles functionalization on AgNPs mutagenicity and toxicity. Our study revealed that AgNPs’ surface modification affects nanoparticles aggregation, and also impacts nanoparticles’ interaction with model acridine mutagen ICR-191. AgNPs coated with MUA showed the most interesting interactions with tested ICR-191, slightly modulating its toxicity properties by decreasing the viability in treated cells.

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Characterization of 11-mercaptoundecanoic and 3-mercaptopropionic acids adsorbed on silver by surface-enhanced Raman scattering

Cited by 34 publications

References 27 publications

Direct molecular-level near-field plasmon and temperature assessment in a single plasmonic hotspot

Direct molecular-level near-field plasmon and temperature assessment in a single plasmonic hotspot

Bi-Ligand Modification of Nanoparticles: An Effective Tool for Surface-Enhanced Raman Spectrometry in Salinated Environments

The Impact of Surface Functionalization on the Biophysical Properties of Silver Nanoparticles

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