Surface-enhanced Raman scattering (SERS) of phthalic acid and 4-methyl phthalic acid on silver colloids as a function of pH

Tourwe, Els; Baert, Kitty; Hubin, Annick

doi:10.1016/j.vibspec.2005.06.005

Cited by 24 publications

(15 citation statements)

References 32 publications

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“…4(A). Although there is some evidence to show the SERS peaks of PA are shifted under different pH and concentrations, [23] the reason for the wavenumber shift for different concentration here, we believe, is the difference in types of adsorption. Since the PA molecule is adsorbed on the surface of silver substrate after the droplet is dry, the pH value does not make sense in this case.…”

Section: Discussion and Future Outlookmentioning

confidence: 61%

Quick detection of contaminants leaching from polypropylene centrifuge tubes with surface‐enhanced Raman spectroscopy and ultraviolet absorption spectroscopy

Gartia

Choi

et al. 2011

J Raman Spectroscopy

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Anomalous surface-enhanced Raman scattering (SERS) peaks were identified for liquid sample stored in polypropylene (PP) centrifuge tubes for months. We observed unexpected Raman peaks during experiments with thiamine hydrochloride aqueous solutions stored in PP tubes for 2 months. In order to identify the contaminants, we have performed SERS experiments on deionized (DI) water stored in PP centrifuge tubes for 2 months and compared them with those from fresh DI water sample. We have also carried out ultraviolet (UV) absorption spectra for both fresh and contaminated water. We believe that the water is contaminated because of chemicals leaching from the PP tube. From the gas chromatography-mass spectrometry data, the main contaminants were found to be phthalic acid (PA) and its derivatives. Further SERS and UV absorption experiment for PA correlated well with the anomalous peaks identified earlier. We qualitatively confirmed the identification and quantitatively estimated the concentration of the suspect contaminants as between 1 and 10 µM with both SERS and UV absorption spectroscopy. With UV absorption spectroscopy, we precisely estimated the concentration as 2.1 µM. We have shown that the sample in PP tube can be contaminated by the leaching chemicals upon long-term storage, and suggest SERS and UV absorption spectroscopy as two quick and simple techniques to detect the contamination.

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Section: Discussion and Future Outlookmentioning

confidence: 61%

Quick detection of contaminants leaching from polypropylene centrifuge tubes with surface‐enhanced Raman spectroscopy and ultraviolet absorption spectroscopy

Gartia

Choi

et al. 2011

J Raman Spectroscopy

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“…For a typical Raman image with a scan range of 15 μm×15 μm, complete Raman spectra were acquired on every pixel with an integration time of 0.3 s per spectrum and an image resolution of 100 pixels×100 lines. To provide a careful analysis of the enhanced Raman scattering signal of phthalic acid on the sample features, all images presented here were processed by integrating the intensity of the Raman spectra at 1346 cm −1 (Supporting Information, Figure S1), which is attributed to the ν s (COO − ) mode of the carboxylate group 35. The microscopic length of the nanowire allows one to spectroscopically address and distinguish each set of nanostructures decorating the silica layer backing along the long wire axis independently.…”

Section: Methodsmentioning

confidence: 99%

Surprisingly Long‐Range Surface‐Enhanced Raman Scattering (SERS) on Au–Ni Multisegmented Nanowires

Wei

Millstone

et al. 2009

Angew Chem Int Ed

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“…27,28 The vibrational modes that are identified are listed on Table I and are assigned based on previous SERS work of -phenylalkanoic acids, carboxylic acids, and characteristic Raman frequencies of benzene derivatives. 27,28,[31][32][33][34][35][36] All samples show common peaks around 620, 1000, 1027, and 1600 cm −1 . These are believed to be modes associated with the phenyl ring of 6b, 12, 18, and 8a, respectively.…”

Section: Methodsmentioning

confidence: 99%

Effects of chromophore orientation and molecule conformation on surface-enhanced Raman scattering studied with alkanoic acids and colloidal silver nanoparticles

Seballos¹,

Olson²,

Zhang³

2006

The Journal of Chemical Physics

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Experimental studies have been carried out to gain a better understanding of the effects of chromophore orientation and molecular conformation on surface-enhanced Raman scattering (SERS) based on metal nanostructures. A series of alkanoic acids that contain a phenyl ring separated by methylene groups from the carboxylic acid, including phenylacetic acid, 3-phenylpropionic acid, 4-phenylbutyric acid, 5-phenylvaleric acid, and 6-phenylhexanoic acid, was investigated as model molecules with colloidal silver nanoparticles as SERS substrates. As the number of methylene groups increases, the molecules display an interesting zigzag intensity pattern of the phenyl ring bending mode around 1000 cm(-1) as well as a trend of appearance and disappearance of either the degenerate ring breathing mode or C[Double Bond]O vibrational mode near 1585 and 1630 cm(-1), respectively. Molecules containing an odd number of methylene units display a higher ring bending intensity and degenerate ring breathing mode and are suggested to have a trans conformation on the particle surface. Molecules with an even number of methylene units show a C[Double Bond]O vibrational mode and weaker ring bending in their SERS spectra and are suggested to have a gauche conformation on the silver nanoparticle surface. The different conformation is attributed to the varying interactions of the carboxylic group or the phenyl ring pi electrons with the silver surface. The SERS intensity was found to change little as the length between the phenyl ring and the carboxylic group was increased by adding CH(2) spacers. This is possibly because the effective distance between the phenyl ring and the silver surface does not change much with increasing number of CH(2) spacers as a result of changes in molecular conformation and variations in the phenyl ring orientation with CH(2) addition. The insight gained from this study is important for understanding SERS of complex molecules for which chromophore orientation and molecular conformation must be taken into careful consideration.

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Surface-enhanced Raman scattering (SERS) of phthalic acid and 4-methyl phthalic acid on silver colloids as a function of pH

Cited by 24 publications

References 32 publications

Quick detection of contaminants leaching from polypropylene centrifuge tubes with surface‐enhanced Raman spectroscopy and ultraviolet absorption spectroscopy

Quick detection of contaminants leaching from polypropylene centrifuge tubes with surface‐enhanced Raman spectroscopy and ultraviolet absorption spectroscopy

Surprisingly Long‐Range Surface‐Enhanced Raman Scattering (SERS) on Au–Ni Multisegmented Nanowires

Effects of chromophore orientation and molecule conformation on surface-enhanced Raman scattering studied with alkanoic acids and colloidal silver nanoparticles

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