Enhancement of Raman light scattering in dye-labeled cell membrane on metal-containing conducting polymer film

Grushevskaya, H. V.; Крылова, Н. Г.; Lipnevich, I. V.; Orekhovskaja, T. I.; Егорова, Валентина Петровна; Shulitski, B. G.

doi:10.1142/s0217979216420182

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…These plasma-forced oscillations reproduce the high-intensity Fe(II)DTP Raman spectrum shown in red in Figure 3 b. The CNT enhancement of light scattering was also observed in [ 74 , 75 ].…”

Section: Discussionsupporting

confidence: 80%

Topological Defects Created by Gamma Rays in a Carbon Nanotube Bilayer

2023

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Graphene sheets are a highly radiation-resistant material for prospective nuclear applications and nanoscale defect engineering. However, the precise mechanism of graphene radiation hardness has remained elusive. In this paper, we study the origin and nature of defects induced by gamma radiation in a graphene rolled-up plane. In order to reduce the environmental influence on graphene and reveal the small effects of gamma rays, we have synthesized a novel graphene-based nanocomposite material containing a bilayer of highly aligned carbon nanotube assemblies that have been decorated by organometallic compounds and suspended on nanoporous Al2O3 membranes. The bilayer samples were irradiated by gamma rays from a 137Cs source with a fluence rate of the order of 105 m−2s−1. The interaction between the samples and gamma quanta results in the appearance of three characteristic photon escape peaks in the radiation spectra. We explain the mechanism of interaction between the graphene sheets and gamma radiation using a pseudo-Majorana fermion graphene model, which is a quasi-relativistic N=3-flavor graphene model with a Majorana-like mass term. This model admits the existence of giant charge carrier currents that are sufficient to neutralize the impact of ionizing radiation. Experimental evidence is provided for the prediction that the 661.7-keV gamma quanta transfer enough energy to the electron subsystem of graphene to bring about the deconfinement of the bound pseudo-Majorana modes and involve C atoms in a vortical motion of the electron density flows in the graphene plane. We explain the radiation hardness of graphene by the topological non-triviality of the pseudo-Majorana fermion configurations comprising the graphene charge carriers.

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Section: Discussionsupporting

confidence: 80%

Topological Defects Created by Gamma Rays in a Carbon Nanotube Bilayer

2023

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“…The Bode peak intensities vary weakly for the temperatures of 30,32,34,36,38,40, 50 • C and largely enough for 60, 65, 70 • C in comparison with the intensity of the peak at RT (see Fig. 4).…”

Section: Dielectric Spectral Analysis Of Low-temperature Dna Hybridiz...mentioning

confidence: 86%

“…The FWCNTs were decorated by the nanocyclic organometallic LBcomplexes. The FWCNT LB-arrays decorated by the dithienylpyrrole complexes of octahedral high spin Fe(II) host spin-polarized graphene charge carriers [31][32][33].…”

Section: Fabrication Of Dithienylpyrrole-coated Fwcnt Arraysmentioning

confidence: 99%

High sensitivity electrochemical DNA sensors for detection of somatic mutations in FFPE samples

Egorova¹,

Grushevskaya²,

Крылова³

et al. 2022

Preprint

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We offer new high-performance label-free electrochemical impedimetric DNA sensors of nonfaradaic type. The DNA sensors based on a platform of crystalline carbon nanotube (CNT) arrays are fabricated by the Langmuir-Blodgett (LB) deposition technique. The CNT arrays are suspended on a nanoporous anodic alumina (aluminium oxide, AOA) support. Single-stranded (ss) 19-and 20-base oligonucleotides and double-stranded (ds) nucleotide sequences were used as probes for chosen molecular target -human KRAS (Kirsten Rat Sarcoma viral oncogene homolog) gene. Genomic deoxyribonucleic acids (DNAs) were isolated from placenta of healthy donors and FFPE (formalin-fixed, paraffinembedded) samples of tumor tissue. Raman spectral analysis and electrochemical dielectric spectroscopy were used to sequence the target DNAs. The optical and electrochemical detection (variants of DNA sequencing) were based on a screening effect that grows after the DNA homoduplex formation. We demonstrated that such technologies are very sensitive and allow to detect attomolar DNA concentrations and less. As result, the KRAS exon 2, codon 12, c.35G>A mutation was successfully discriminated in human genomic DNA isolated from FFPE colorectal cancer tumor tissue samples.

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“…1a was utilized to synthesize a nanocyclic compound (Fe(II)DTP) of the dithienylpyrrole with hight-spin divalent Fe(II) decorating carbon nanotubes [17]. The Fe(II)DTP films are fabricated by the LB technique [18]. The complex of Fe(II)DTP is presented in Inset to Halina Grushevskaya and George Krylov Fig.…”

Section: Methodsmentioning

confidence: 99%

Topologically Tuned Obliquity of Klein-Tunnelling Charged Currents Through Graphene Electrostatically-Confined p - n Junctions

Grushevskaya

Krylov

2022

Nonlinear Phenomena in Complex Systems

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Problem of control over Klein-tunnelling states from electrostatically-confined graphene p - n junctions has been discussed. The lack of quasi-bound states, being the states with a finite life time, in a pseudo-Dirac-fermion model for the graphene quantum dot (GQD) is theoretically predicted as inapplicability of the so-called "resonance condition" leading to an inconsistent linear system corresponding to matching conditions. Within a pseudo-Dirac-Weyl fermion model GQD, the graphene charge carriers are topologically nontrivial and can be confined by a staircase-type potential due to competition between Zak curvature and centrifugal-force actions. The predicted topological effects elucidate experimentally observed resonances created by electron beam and laser pulse in crystalline arrays of single-walled carbon nanotubes as the Klein-tunnelling resonant states in the p - n graphene junctions. We present a robust approach to fabricate stable graphene p - n junctions by fine-tuning the topological effects.

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Enhancement of Raman light scattering in dye-labeled cell membrane on metal-containing conducting polymer film

Cited by 6 publications

References 23 publications

Topological Defects Created by Gamma Rays in a Carbon Nanotube Bilayer

Topological Defects Created by Gamma Rays in a Carbon Nanotube Bilayer

High sensitivity electrochemical DNA sensors for detection of somatic mutations in FFPE samples

Topologically Tuned Obliquity of Klein-Tunnelling Charged Currents Through Graphene Electrostatically-Confined p - n Junctions

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