Double Amino Functionalized Ag Nanoparticles as SERS Tags in Raman Diagnostic

Pinzaru, Simona Cîntă; Fălămaș, Alexandra; Dehelean, Cristina; Morari, Cristian; Venter, Monica M.

doi:10.5562/cca2067

Cited by 9 publications

(4 citation statements)

References 28 publications

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“…For this, the Raman spectra were taken in the KC at the resonance angle. A tentative assignment of the vibrational lines is given in Table S1 (Supporting Information). The collection of each Raman spectrum took approx.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the chemical enhancement contribution to SERS using a Kretschmann arrangement

Mohaghegh

Tehrani

Materny

2016

J Raman Spectroscopy

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Using a Kretschmann configuration-based setup, surface-enhanced Raman scattering (SERS) experiments have been performed on a monolayer of Nile blue. The experiment has been optimized to achieve reproducible conditions. Laser excitation resulted in a fast decay of the Raman line intensities ending at a stable signal level. We have analyzed this intensity variation mode specifically. The Raman deactivation rate was found to be different for different vibrational modes where high-wavenumber vibrations showed slower decay than the group of low-wavenumber modes. SERS spectra were obtained excluding the contribution of this deactivation process for different angles of incidence of the exciting laser beam. The variation of the surface plasmon excitation in the thin silver film coated onto the prism surface of the Kretschmann configuration resulted in drastically different relative enhancements of the different Raman modes pointing to a major contribution of the chemical enhancement mechanism in the single-layer SERS experiment. The enhancement was found to be mode-specific. High-wavenumber modes showed a stronger enhancement than the low-wavenumber group.

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Section: Resultsmentioning

confidence: 99%

Investigation of the chemical enhancement contribution to SERS using a Kretschmann arrangement

Mohaghegh

Tehrani

Materny

2016

J Raman Spectroscopy

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“…For CV + , structures with the positive charge at various locations (NH 2 + , O + and N + ) can be considered. However, these structures are not distinguished in the present work because this charge is delocalized over the entire molecule in DFT calculations [25]. Therefore, CV + was optimized as a structure with two amino groups and a positive charge distributed over the entire molecule.…”

Section: Characteristics Of CVmentioning

confidence: 98%

“…Additionally, the absorption peak of CV + on a Langmuir-Blodgett film is observed at~525 nm [29]. On the other hand, the monomeric band of CV + is known to have a λ max of~585 nm [25,[28][29][30]. This band means that the energy of the charge-transfer state of CV + was overestimated in the TD-DFT calculation at the B3LYP/6-31+G** level of theory.…”

Section: Characteristics Of CVmentioning

confidence: 99%

Computational Study of Cresyl Violet Covalently Attached to the Silane Coupling Agents: Application to TiO2-Based Photocatalysts and Dye-Sensitized Solar Cells

Takeshita

2020

Nanomaterials

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The covalent attachment of photosensitizing dyes to TiO2 using silane coupling agents (SCAs) is a promising strategy for enhancing the photocatalytic activity of TiO2-based photocatalysts and the photovoltaic conversion of dye-sensitized solar cells (DSSCs). This approach can control the geometry and orientation of the photosensitizing dye on the TiO2 surface. In this study, a density functional theory (DFT) and time-dependent DFT (TD-DFT) investigation was carried out on cresyl violet (CV) covalently attached to SCAs with a terminal oxirane group (OTES–Cn) to reveal the influence of OTES–Cn on the geometry of the photosensitizing dyes. The potential of CV covalently attached to OTES–Cn (CV–OTES–Cn) to act as a photosensitizing dye was also analyzed. The hydroxyl group formed by the epoxy-opening reaction between CV and OTES–Cn strongly influenced the geometry of CV–OTES–Cn, which was attributed to a CH–O interaction. Additionally, TD-DFT, frontier molecular orbital and molecular electrostatic potential calculations revealed that CV–OTES–Cn has excellent optical properties and electron injection ability. In particular, the characteristics of the unbent conformation of CV–OTES–Cn are expected to contribute significantly to the photocurrent in TiO2-based photocatalysts and DSSCs. These findings enhance the understanding of the covalent attachment strategy using SCAs and contribute to improving TiO2-based photocatalysts and DSSCs.

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“…The samples of fungal mycelia, fungal spores, and banana pseudostems were detected with the aforementioned QE65 Pro Raman spectrometer at a laser power of 20 mW, and the integration time for the three types of samples were 15, 10, and 3 s, respectively. The strong [29] and reproducible [30] Raman peaks among the measured SERS spectra were selected as the fingerprinting/characteristics of the Raman spectra.…”

Section: Sers Measurementsmentioning

confidence: 99%

Construction of Raman spectroscopic fingerprints for the detection of Fusarium wilt of banana in Taiwan

Lin

2020

PLoS ONE

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Banana (Musa sp.) is cultivated worldwide and is one of the most popular fruits. The soilborne fungal disease Fusarium wilt of banana (FWB), commonly known as Panama disease, is caused by Fusarium oxysporum f. sp. cubense (Foc) and is a highly lethal vascular fungal disease in banana plants. Raman spectroscopy, an emerging laser-based technology based on Raman scattering, has been used for the qualitative characterization of biological tissues such as foodborne pathogens, cancer cells, and melamine. In this study, we describe a Raman spectroscopic technique that could potentially be used as a method for diagnosing FWB. To that end, the Raman fingerprints of Foc (including mycelia and conidia) and Foc-infected banana pseudostems with varying levels of symptoms were determined. Our results showed that eight, eleven, and eleven characteristic surface-enhanced Raman spectroscopy peaks were observed in the mycelia, microconidia, and macroconidia of Foc, respectively. In addition, we constructed the Raman spectroscopic fingerprints of banana pseudostem samples with varying levels of symptoms in order to be able to differentiate Foc-infected bananas from healthy bananas. The rate at which FWB was detected in asymptomatic Foc-infected samples by using the spectral method was 76.2%, which was comparable to the rates previously reported for other FWB detection methods based on real-time PCR assays, suggesting that the spectral method described herein could potentially serve as an alternative tool for detecting FWB in fields. As such, we hope that the developed spectral method will open up new possibilities for the on-site diagnosis of FWB.

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Double Amino Functionalized Ag Nanoparticles as SERS Tags in Raman Diagnostic

Cited by 9 publications

References 28 publications

Investigation of the chemical enhancement contribution to SERS using a Kretschmann arrangement

Investigation of the chemical enhancement contribution to SERS using a Kretschmann arrangement

Computational Study of Cresyl Violet Covalently Attached to the Silane Coupling Agents: Application to TiO2-Based Photocatalysts and Dye-Sensitized Solar Cells

Construction of Raman spectroscopic fingerprints for the detection of Fusarium wilt of banana in Taiwan

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