Study of Vibronic Interactions in Impurity Centers by Conjugate Fluorescence and Absorption Spectra with a Poorly Resolved Vibrational Structure

Naumova, N. L.; Васильева, И. А.; Osad’ko, I. S.; Naumov, Andrei V.

doi:10.1134/1.1914889

Cited by 23 publications

(4 citation statements)

References 14 publications

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“…This enhancement is due to the strong modifications of local fields, that also change the luminescence properties [3][4][5]. The analysis of fine structured electronic-vibrational luminescence spectra is also quite a productive analytical method, but usually at cryogenic conditions [6,7], as well as comparison of data on phonoluminescence and Raman scattering [8]. Considering the influence of local fields, it is also important to take into account their fluctuations in dielectric solutions, thus enhancement parameters may vary from molecule to molecule [9,10], as well as the structure of plasmonic near field [11].…”

Section: Introductionmentioning

confidence: 99%

Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates

et al. 2021

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This paper presents a cost-effective approach for the template-assisted electrodeposition fabrication of substrates for surface-enhanced Raman scattering (SERS) with metal nanowires (NWs) grown in pores of polymer track-etched membranes (TM). This technique allows the synthesis of NWs array with its certain surface density and diameter (from dozen to hundreds of nm). NWs length also may be varied (order of μm) by controlling deposition time. Here we grow vertical Ag-NWs which are leaning towards their nearest neighbors, forming self-assembled bundles whose parameters depend on the NW aspect ratio (length to diameter). We show that in such bundles there are “hot spots” in the nm-gaps between NWs tips. Computer simulations have demonstrated a strong enhancement of the electric field within these hot spots; thus, the Raman signal is markedly amplified for analyte molecules placed directly inside the gaps. We have experimentally proved the potential of this SERS-technique on the example of 4-Mercaptophenylboronic acid (4-MPBA). For 4-MPBA the maximal enhancement of Raman signal was found at NWs length of ~1.6 μm and diameter of ~100 nm. The effect is higher (up to twice) if “wet” substrate is used just immediately after the TM polymer removal so that the tips are brought to lean after analyte exposure. We suggest this new type of nanostructured SERS-substrates as a base of effective sensing of extremely low concentration of analytes.

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Section: Introductionmentioning

confidence: 99%

Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates

et al. 2021

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“…It greatly expands the possibilities for use of the fragmented approach to describe the fundamental bands of molecules [6,7,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it was interest to produce the comparative analysis of the spectral properties of ketones and diphenylpolyenes at the same time, and quantification of the contribution of intramolecular interactions in the organization of the fine-structure spectra of these molecules. In order to realize such kind if investigations the different methods of selective laser spectroscopy can be used [2,3], in particular vibrational analysis of conjugated absorption and luminescence spectra [4][5][6][7].In this study, the basic osciliation for ketones with general formula R1,2=Ph-CO-R1 (where R1o(CH=CH)2-N(CH3)2, R2oCH3-NC4H3-CH, Pho(HOC6H6)) were correlated with the interpretation of similar value and substituent frequencies 1,4-diphenylbutadiene with the substituent on the ring N(CH3)2 and NO2, respectively (after -DFB3), which spectral properties have been studied previously [8][9][10]. We shown how band intensities ketones characterizing polyene bridge and the phenyl ring are changes.…”

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Analysis of vibronic interactions in the molecules of cross-conjugated ketones

Kompaneez

Vasilieva

2016

EPJ Web Conf.

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Abstract.We have done quantitative analysis of vibronic parameters of two cross-conjugated δ-dimethylaminoketones. The research shows the influence of С-N and C=O bonds in the rings, and the radicals with nitro compounds on the vibronic parameters of characteristic bands, which describe the state (vibrations, types of deformation under excitation) of the phenyl ring and the polyene bridge. Results described impact of the substituent's nature on the parameters of intra-and intermolecular interactions presents for the studied compounds.We have done analyses, which interpreting major characteristic vibrational bands crosssubstituted ketones. It shows that ketones like the diphenylpolyenes, one can observe the appearance of the lines in the spectra which corresponding to the change of such specific elements molecules as polyene bridge or aromatic ring.It is known that frequency bands of compounds with the carbonyl group in six-bonds ring are the same as in the compounds with the open chain (when C=O group is located between two methylene groups) [1], however, it known nothing about the intensity of these bands. Therefore, it was interest to produce the comparative analysis of the spectral properties of ketones and diphenylpolyenes at the same time, and quantification of the contribution of intramolecular interactions in the organization of the fine-structure spectra of these molecules. In order to realize such kind if investigations the different methods of selective laser spectroscopy can be used [2,3], in particular vibrational analysis of conjugated absorption and luminescence spectra [4][5][6][7].In this study, the basic osciliation for ketones with general formula R1,2=Ph-CO-R1 (where R1o(CH=CH)2-N(CH3)2, R2oCH3-NC4H3-CH, Pho(HOC6H6)) were correlated with the interpretation of similar value and substituent frequencies 1,4-diphenylbutadiene with the substituent on the ring N(CH3)2 and NO2, respectively (after -DFB3), which spectral properties have been studied previously [8][9][10]. We shown how band intensities ketones characterizing polyene bridge and the phenyl ring are changes. We selected the first molecule of the ketone with the same substituents as locate in DFB3, left polyene chain in the second molecule of the ketone folds into a five-membered ring (R2).It is shown that the parameters of vibronic spectra of ketone molecules exhibit a high degree of tolerance in the molecules sequence which having the same set of structural elements. It greatly expands the possibilities for use of the fragmented approach to describe the fundamental bands of molecules [6,7,[11][12][13].Participation ketone molecules in the formation of hydrogen bonds significantly reduces the frequency of the C=O (Tab. 1, line 2), conjugate with multiple bonds and aromatic rings

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Impurity spectroscopy at its ultimate limit: relation between bulk spectrum, inhomogeneous broadening, and local disorder by spectroscopy of (nearly) all individual dopant molecules in solids

Naumov

Gorshelev

Vainer

et al. 2011

Phys. Chem. Chem. Phys.

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We present a technique for the measurement of the low-temperature fluorescence excitation spectra and imaging of a substantial fraction of all single chromophore molecules (hundreds of thousands and even more) embedded in solid bulk samples as nanometre-sized probes. An important feature of our experimental studies is that the full information about the lateral coordinates and spectral parameters of all individual molecules is stored for detailed analysis. This method enables us to study a bulk sample in a broad spectral region with ultimate sensitivity, combining excellent statistical accuracy and the capability of detecting rare events. From the raw data we determined the distributions of several parameters of the chromophore spectra and their variations across the inhomogeneous absorption band, including the frequencies of the electronic zero-phonon lines, their spectral linewidths, and fluorescence count rates. Relationships between these distributions and the disorder of the matrix were established for the examples of two polycrystalline solids with very different properties, n-hexadecane and o-dichlorobenzene, and the amorphous polymer polyisobutylene. We also found spatially inhomogeneous distributions of some parameters.

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Study of Vibronic Interactions in Impurity Centers by Conjugate Fluorescence and Absorption Spectra with a Poorly Resolved Vibrational Structure

Cited by 23 publications

References 14 publications

Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates

Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates

Analysis of vibronic interactions in the molecules of cross-conjugated ketones

Impurity spectroscopy at its ultimate limit: relation between bulk spectrum, inhomogeneous broadening, and local disorder by spectroscopy of (nearly) all individual dopant molecules in solids

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