Study of adsorption behavior of aminothiophenols on gold nanorods using surface-enhanced Raman spectroscopy

Tiwari, Neha

doi:10.1117/1.3594096

Cited by 25 publications

(18 citation statements)

References 42 publications

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“…We demonstrated SERS activity of the fabricated Au-nanopillars with 4-aminothiophenol (ATP) that was chemisorbed onto the surface via Au-S bonds. The obtained SERS spectra of ATP were in accordance with previously reported SERS spectra of ATP adsorbed onto gold nanorings 47 and gold nanorods 48 . The two prominent characteristic peaks of ATP located at 1078 and 1586 cm −1 , correspond to C-S stretching and C-C stretching, respectively (Fig.…”

Section: Functional Group 3-carbon Chain 11-carbon Chainsupporting

confidence: 90%

Surface enhanced Raman scattering artificial nose for high dimensionality fingerprinting

et al. 2020

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Label-free surface-enhanced Raman spectroscopy (SERS) can interrogate systems by directly fingerprinting their components' unique physicochemical properties. In complex biological systems however, this can yield highly overlapping spectra that hinder sample identification. Here, we present an artificial-nose inspired SERS fingerprinting approach where spectral data is obtained as a function of sensor surface chemical functionality. Supported by molecular dynamics modeling, we show that mildly selective self-assembled monolayers can influence the strength and configuration in which analytes interact with plasmonic surfaces, diversifying the resulting SERS fingerprints. Since each sensor generates a modulated signature, the implicit value of increasing the dimensionality of datasets is shown using cell lysates for all possible combinations of up to 9 fingerprints. Reliable improvements in mean discriminatory accuracy towards 100% are achieved with each additional surface functionality. This arrayed label-free platform illustrates the wide-ranging potential of high-dimensionality artificial-nose based sensing systems for more reliable assessment of complex biological matrices.

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Section: Functional Group 3-carbon Chain 11-carbon Chainsupporting

confidence: 90%

Surface enhanced Raman scattering artificial nose for high dimensionality fingerprinting

et al. 2020

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“…Figure 6. This is in line with earlier works made by others that have reported less coverage of the NRs {100} faces by the surfactant bilayer, 54,55,74 thereby facilitating the chemisorption of other adsorbates at those faces [75][76][77] . These findings are in agreement with our etching experiments because as the Au NPs approach the spherical shape, CTAB will compete for the adsorption at the rods ends thus limiting the chemisorption of the DTC anions at the more SERS sensitive {100} facets ( Figure 6).…”

Section: 3)supporting

confidence: 90%

Resizing of Colloidal Gold Nanorods and Morphological Probing by SERS

2013

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In this research, we demonstrate that Surface Enhanced Raman Scattering (SERS) spectroscopy can be used to monitor variations in the aspect ratio (A.R.) of colloidal gold nanorods (NRs) during a chemical etching process. The A.R. of colloidal Au NRs prepared by a seed method was deliberately decreased by addition of aqueous K 2 S 2 O 8 . SERS studies using a 1064 nm laser line revealed a decrease on the detection sensitivity as the nanorods became shorter and using the anion diethyldithiocarbamate (DTC) as the analytical probe. The morphological changes observed for distinct reaction times have also been confirmed by TEM and optical measurements. The dependence of the SERS sensitivity observed for Au NRs of variable A.R. has been investigated either by using colloids submitted to etching at distinct reaction temperatures or by using a distinct excitation laser line. Therefore, this spectroscopic method offers the possibility to probe in situ changes on the A.R. of colloidal Au NRs in analytical contexts in which other techniques cannot be easily implemented.

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“…Here, in the case of the Au film no peaks are found since the Raman signal from 4-ATP molecules is too weak to be detected whilst the main fingerprint regions of 4-ATP are clearly visible from the Au-capped nano mushroom arrays and comparable with the ones reported in literature. 90,91 In particular, the dominant spectral bands peaked at 1074 cm -1 and at 1581 cm -1 , that correspond respectively to the S-C-stretching vibration and to the aromatic ring chain vibrations, confirm the formation of Au-S bond as a result of the SAM formation. The enhancement factor (EF) calculated for the SERS peak at 1074 cm -1 is equal to 2.7 x10 6 and at 1581 cm -1 is 3.3 x10 6 (details on the calculation are included in the Supporting Information).…”

Section: Nanoscale Advances Accepted Manuscriptmentioning

confidence: 79%

Breaking the symmetry of nanosphere lithography with anisotropic plasma etching induced by temperature gradients

et al. 2021

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Study of adsorption behavior of aminothiophenols on gold nanorods using surface-enhanced Raman spectroscopy

Cited by 25 publications

References 42 publications

Surface enhanced Raman scattering artificial nose for high dimensionality fingerprinting

Surface enhanced Raman scattering artificial nose for high dimensionality fingerprinting

Resizing of Colloidal Gold Nanorods and Morphological Probing by SERS

Breaking the symmetry of nanosphere lithography with anisotropic plasma etching induced by temperature gradients

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