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  1. Article ; Online: Mechanism of Thermal Charge Relaxation in Poled Silicate Glasses in a Wide Temperature Range (From Liquid Nitrogen to Glass Melting Temperature).

    Raskhodchikov, D / Reshetov, I / Brunkov, P / Kaasik, V / Lipovskii, A / Tagantsev, D

    The journal of physical chemistry. B

    2020  Volume 124, Issue 36, Page(s) 7948–7956

    Abstract: Data on thermally stimulated depolarization current (TSDC) study of the same poled glass in the temperature range 100-1000 K are analyzed. Four specific temperature ranges in the TSDC spectrum of this glass are identified, with each range being ... ...

    Abstract Data on thermally stimulated depolarization current (TSDC) study of the same poled glass in the temperature range 100-1000 K are analyzed. Four specific temperature ranges in the TSDC spectrum of this glass are identified, with each range being attributed to the charge relaxation processes of different natures. During linear heating in the temperature range 100-250 K, charge relaxation is related to the adsorption/desorption of particles from the atmosphere, supposedly water cluster ions H
    Language English
    Publishing date 2020-08-26
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5207
    ISSN (online) 1520-5207
    DOI 10.1021/acs.jpcb.0c04537
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Measuring the height-to-height correlation function of corrugation in suspended graphene.

    Kirilenko, D A / Brunkov, P N

    Ultramicroscopy

    2016  Volume 165, Page(s) 1–7

    Abstract: Nanocorrugation of 2D crystals is an important phenomenon since it affects their electronic and mechanical properties. The corrugation may have various sources; one of them is flexural phonons that, in particular, are responsible for the thermal ... ...

    Abstract Nanocorrugation of 2D crystals is an important phenomenon since it affects their electronic and mechanical properties. The corrugation may have various sources; one of them is flexural phonons that, in particular, are responsible for the thermal conductivity of graphene. A study of corrugation of just the suspended graphene can reveal much of valuable information on the physics of this complicated phenomenon. At the same time, the suspended crystal nanorelief can hardly be measured directly because of high flexibility of the 2D crystal. Moreover, the relief portion related to rapid out-of-plane oscillations (flexural phonons) is also inaccessible by such measurements. Here we present a technique for measuring the Fourier components of the height-height correlation function H(q) of suspended graphene which includes the effect of flexural phonons. The technique is based on the analysis of electron diffraction patterns. The H(q) is measured in the range of wavevectors q≈0.4-4.5nm(-1). At the upper limit of this range H(q) does follow the T/κq(4) law. So, we measured the value of suspended graphene bending rigidity κ=1.2±0.4eV at ambient temperature T≈300K. At intermediate wave vectors, H(q) follows a slightly weaker exponent than theoretically predicted q(-3.15) but is closer to the results of the molecular dynamics simulation. At low wave vectors, the dependence becomes even weaker, which may be a sign of influence of charge carriers on the dynamics of undulations longer than 10nm. The technique presented can be used for studying physics of flexural phonons in other 2D materials.
    Language English
    Publishing date 2016
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1479043-9
    ISSN 1879-2723 ; 0304-3991
    ISSN (online) 1879-2723
    ISSN 0304-3991
    DOI 10.1016/j.ultramic.2016.03.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Mechanism of Thermal Charge Relaxation in Poled Silicate Glasses in a Wide Temperature Range (From Liquid Nitrogen to Glass Melting Temperature)

    Raskhodchikov, D / Reshetov, I / Brunkov, P / Kaasik, V / Lipovskii, A / Tagantsev, D

    Journal of physical chemistry. 2020 Aug. 11, v. 124, no. 36

    2020  

    Abstract: Data on thermally stimulated depolarization current (TSDC) study of the same poled glass in the temperature range 100–1000 K are analyzed. Four specific temperature ranges in the TSDC spectrum of this glass are identified, with each range being ... ...

    Abstract Data on thermally stimulated depolarization current (TSDC) study of the same poled glass in the temperature range 100–1000 K are analyzed. Four specific temperature ranges in the TSDC spectrum of this glass are identified, with each range being attributed to the charge relaxation processes of different natures. During linear heating in the temperature range 100–250 K, charge relaxation is related to the adsorption/desorption of particles from the atmosphere, supposedly water cluster ions H⁺(H₂O)ₙ. The next TSDC band, which is observed at room temperature and above, is related to the disordering of the polar structural entities. The TSDC band in the temperature range 500–750 K is attributed to the relaxation of spatial charge by the diffusion mechanism. The TSDC band in the temperature range 750–1000 K is attributed to the relaxation of spatial charge by the viscous flow mechanism. All these data allowed drawing a schematic TSDC spectrum of silicate glasses in the full temperature range.
    Keywords adsorption ; ambient temperature ; desorption ; glass ; heat ; liquid nitrogen ; silicates
    Language English
    Dates of publication 2020-0811
    Size p. 7948-7956.
    Publishing place American Chemical Society
    Document type Article
    Note NAL-AP-2-clean
    ISSN 1520-5207
    DOI 10.1021/acs.jpcb.0c04537
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: New method for MBE growth of GaAs nanowires on silicon using colloidal Au nanoparticles.

    Bouravleuv, A / Ilkiv, I / Reznik, R / Kotlyar, K / Soshnikov, I / Cirlin, G / Brunkov, P / Kirilenko, D / Bondarenko, L / Nepomnyaschiy, A / Gruznev, D / Zotov, A / Saranin, A / Dhaka, V / Lipsanen, H

    Nanotechnology

    2017  Volume 29, Issue 4, Page(s) 45602

    Abstract: We present a new method for the deposition of colloidal Au nanoparticles on the surface of silicon substrates based on short-time Ar plasma treatment without the use of any polymeric layers. The elaborated method is compatible with molecular beam epitaxy, ...

    Abstract We present a new method for the deposition of colloidal Au nanoparticles on the surface of silicon substrates based on short-time Ar plasma treatment without the use of any polymeric layers. The elaborated method is compatible with molecular beam epitaxy, which allowed us to carry out the detailed study of GaAs nanowire synthesis on Si(111) substrates using colloidal Au nanoparticles as seeds for their growth. The results obtained elucidated the causes of the difference between the initial nanoparticle sizes and the diameters of the grown nanowires.
    Language English
    Publishing date 2017-11-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/aa9ab1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Decoupling the Positive and Negative Aging Processes of Perovskite Light-Emitting Diodes Using a Thin Interlayer of Ionic Liquid.

    Sun, Shuo / Si, Junjie / Gao, Yun / Xu, Rui / Du, Yihang / Zhang, Taotao / Li, Hongjin / Yao, Xin / Ai, Qi / Cai, Peiqing / Cai, Muzhi / Tang, Ying / Rabchinskii, Maxim / Brunkov, Pavel / Ye, Zhizhen / Dai, Xingliang / Liu, Zugang

    The journal of physical chemistry letters

    2021  Volume 12, Issue 32, Page(s) 7783–7791

    Abstract: A positive aging phenomenon, that is, enhancement of the electroluminescence performance at the beginning of electrical aging, is commonly observed for the state-of-the-art perovskite light-emitting diodes (PeLEDs). The origins of positive aging could ... ...

    Abstract A positive aging phenomenon, that is, enhancement of the electroluminescence performance at the beginning of electrical aging, is commonly observed for the state-of-the-art perovskite light-emitting diodes (PeLEDs). The origins of positive aging could fundamentally interfere with those of the operational deterioration processes of PeLEDs (namely negative aging), bringing difficulty in analyzing the degradation mechanisms. This work decouples the positive and negative aging processes of PeLEDs by inserting a thin ionic liquid interlayer between the hole-injection layer and the perovskite layer. This interlayer inhibits ions migration by passivating the halogen vacancies of perovskite films and suppresses interfacial exciton quenching, enabling us to decouple the positive and negative aging processes of PeLEDs while increasing the device efficiency. Inserting an ionic liquid interlayer is also demonstrated to be effective for iodide-based PeLEDs and applicable with the use of other ionic liquids. Our work provides an ideal system for fundamental studies on the degradation mechanisms of PeLEDs.
    Language English
    Publishing date 2021-08-10
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.1c02024
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Hole-matrixed carbonylated graphene: Synthesis, properties, and highly-selective ammonia gas sensing

    Rabchinskii, M.K / Varezhnikov, A.S / Sysoev, V.V / Solomatin, M.A / Ryzhkov, Sergei A / Baidakova, M.V / Stolyarova, D. Yu / Shnitov, V.V / Pavlov, Sergei S / Kirilenko, D.A / Shvidchenko, A.V / Lobanova, E. Yu / Gudkov, M.V / Smirnov, D.A / Kislenko, V.A / Pavlov, S.V / Kislenko, S.A / Struchkov, N.S / Bobrinetskiy, I.I /
    Emelianov, A.V / Liang, P / Liu, Z / Brunkov, P.N

    Carbon. 2021 Feb., v. 172

    2021  

    Abstract: Here, the synthesis of holey carbonylated (C-ny) graphene derivative and its application for gas sensing is demonstrated. The carbonylation of graphene oxide leads to the 3-fold increase in the concentration of carbonyl groups’ up to 9 at.% with a ... ...

    Abstract Here, the synthesis of holey carbonylated (C-ny) graphene derivative and its application for gas sensing is demonstrated. The carbonylation of graphene oxide leads to the 3-fold increase in the concentration of carbonyl groups’ up to 9 at.% with a substantial elimination of other oxygen functionalities. Such a chemical modification is accompanied by the perforation of the graphene layer with the appearance of matrices of nanoscale holes, leading to corrugation of the layer and its sectioning into localized domains of the π-conjugated network. Combined with the predominant presence of carbonyls, granting the specificity in gas molecules adsorption, these features result in the enhanced gas sensing properties of C-ny graphene at room temperature with a selective response to NH₃. Opposite chemiresistive response towards ammonia when compared to other analytes, such as ethanol, acetone, CO₂, is demonstrated for the C-ny graphene layer both in humid and dry air background. Moreover, a selective discrimination of all of the studied analytes is further approached by employing a vector signal generated by C-ny multielectrode chip. Comparing the experimental results with the calculations performed in framework of density functional theory, we clarify the effect of partial charge transfer caused by water and ammonia adsorption on the chemiresistive response.
    Keywords acetone ; adsorption ; air ; ambient temperature ; ammonia ; carbon dioxide ; chemical species ; density functional theory ; ethanol ; graphene ; graphene oxide ; oxygen
    Language English
    Dates of publication 2021-02
    Size p. 236-247.
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2020.09.087
    Database NAL-Catalogue (AGRICOLA)

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