Electric field assisted alignment of monoatomic carbon chains

Kutrovskaya, S.; Chestnov, I. Yu.; Osipov, A.; Samyshkin, Vlad; Sapegina, I. V.; Kavokin, Alexey; Kucherik, A. O.

doi:10.1038/s41598-020-65356-8

Cited by 20 publications

(25 citation statements)

References 27 publications

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“…It is important to note also that if NPs at the opposite ends of a carbon chain are of different sizes, the difference of their work functions results in the charging of the carbon–NP complex that acquires a stationary dipole moment. This dipole polarization provides a tool for the chain ordering by an applied voltage …”

Section: Resultsmentioning

confidence: 99%

Excitonic Fine Structure in Emission of Linear Carbon Chains

et al. 2020

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We studied monatomic linear carbon chains stabilized by gold nanoparticles attached to their ends and deposited on a solid substrate. We observe spectral features of straight chains containing from 8 to 24 atoms. Low-temperature PL spectra reveal characteristic triplet fine structures that repeat themselves for carbon chains of different lengths. The triplet is invariably composed of a sharp intense peak accompanied by two broader satellites situated 15 and 40 meV below the main peak. We interpret these resonances as an edge-state neutral exciton and positively and negatively charged trions, respectively. The time-resolved PL shows that the radiative lifetime of the observed quasiparticles is about 1 ns, and it increases with the increase of the length of the chain. At high temperatures a nonradiative exciton decay channel appears due to the thermal hopping of carriers between parallel carbon chains. Excitons in carbon chains possess large oscillator strengths and extremely low inhomogeneous broadenings.

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Section: Resultsmentioning

confidence: 99%

Excitonic Fine Structure in Emission of Linear Carbon Chains

et al. 2020

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“…They were grown by the laser ablation in liquid (LAL) and deposited on a fused quartz substrate for the photoluminescence (PL) study. The chains were stabilized by gold anchors attached to their ends [6]. In low temperature PL spectra, we have observed the characteristic triplet structure (Fig.…”

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confidence: 86%

“…[1] we attributed the main peak of every triplet to the neutral exciton transition and two lower energy satellites to charged exciton (trion) transitions, respectively. The main argument supporting this interpretation was the detected dipole polarization of about a half of carbon-metal nanocomplexes that was revealed by their alignment in the presence of the external electric field [6].…”

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confidence: 87%

“…The focus of our study was on elongated polyynic molecules, containing straight parts of even numbers of atoms (from 8 to 24) regularly separated with kinks. The synthesised sp 1 -hybridization chains were packed in hexagon bundles characterised by the distance between neighboring parallel chains of 5.35 A [6]. The chains were hold together by the Van der Waals force (see the schematic in Fig.…”

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confidence: 99%

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Exciton energy spectra in polyyne chains

Kutrovskaya

Demirchyan

Osipov

et al. 2021

Phys. Rev. Research

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Recently, we have experimentally observed signatures of sharp exciton peaks in the photoluminescence spectra of bundles of monoatomic carbon chains stabilized by gold nanoparticles and deposited on a glass substrate [1]. Here, we estimate the characteristic energies of excitonic transitions in this complex quasi-one-dimensional nano-system with use of the variational method. We show that the characteristic energy scale for the experimentally observed excitonic fine structure is governed by the interplay between the hopping energy in a Van der Waals quasicrystal formed by parallel carbon chains, the neutral-charged exciton splitting and the positive-negative trion splitting. These three characteristic energies are an order of magnitude lower than the direct exciton binding energy.

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“…For example, if the particle is formed by the high-conductivity nanorod core and the fluorophore shell of the type discussed in the above paragraph, the external light, polarized along the nanorod axis (longitudinally) will excite the fluorescence, whereas when the light is polarized orthogonally (in the transverse plane), the transverse plasmon resonance will be excited, which leads to the luminescence quenching [40]. When such particles are used as the probe particles, their uniform orientation can be achieved due to their anisotropic polarizability and intrinsic dipole moments [43][44][45][46][47], e.g., by means of a static electric field oriented vertically in the geometry corresponding to the arrangement of Figure 4.…”

Section: Discussionmentioning

confidence: 99%

Fluorescence Record Diagnostics of 3D Rough-Surface Landscapes With Nano-Scale Inhomogeneities

et al. 2022

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The paper proposes a new approach that enables the structure analysis and reconstruction of a rough surface where the height of inhomogeneities (from the depression to the upper point) varies within the spread about 20 nm. For the surface diagnostics, carbon nanoparticles are used, which serve as sensitive probes of the local surface height. A single nanoparticle can be positioned at a desirable point of the studied surface with the help of an optical tweezer employing the He-Ne laser radiation. Then the particle is illuminated by the strongly focused exciting beam of 405 nm wavelength, with the waist plane precisely fixed at a certain distance from the surface base plane. The particle’s luminescence response (in the yellow-green spectral range) strongly depends on the distance between the exciting beam waist and the particle, thus indicating the local height of the surface. After scanning the surface area and the consecutive interpolation, the surface “vertical” landscape can be reconstructed with a high accuracy: the numerical simulation shows that the RMS surface roughness is restored with an accuracy of 6.9% while the landscape itself is reconstructed with the mean error 7.7%.

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Electric field assisted alignment of monoatomic carbon chains

Cited by 20 publications

References 27 publications

Excitonic Fine Structure in Emission of Linear Carbon Chains

Excitonic Fine Structure in Emission of Linear Carbon Chains

Exciton energy spectra in polyyne chains

Fluorescence Record Diagnostics of 3D Rough-Surface Landscapes With Nano-Scale Inhomogeneities

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