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    Wyświetlanie 1-5 z 5
    Tytuł:
    Impact of the Method of Separating Graphene from the Growth Substrate on the Quality of the 2D Material Obtained
    Autorzy:
    Dybowski, K.
    Romaniak, G.
    Kula, P.
    Jeziorna, A.
    Kowalczyk, P.
    Atraszkiewicz, R.
    Kołodziejczyk, Ł.
    Nowak, D.
    Zawadzki, P.
    Kucińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351974.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    graphene
    polycrystalline graphene
    electrochemical delamination
    chemical etching
    graphene transfer
    Opis:
    This article presents the research results on impact of the method of polycrystalline graphene layers separation from the growth substrate on the obtained carbon material quality. The studies were carried out on graphene sheets obtained by metallurgical method on a liquid metal substrate (HSMG® graphene). The graphene was separated using chemical etching method or the electrochemical delamination method, by separating by means of electrolysis. During electrolysis, hydrogen is emitted on a graphene-covered of cathode (metal growth substrate) as a result of the voltage applied. The graphene layer breaks away from metallic substrate by gas accumulation between them. The results from these separation processes were evaluated by means of different tools, such as SEM, TEM and AFM microscopy as well as Raman Spectroscopy. In summary, the majority of analyses indicate that the graphene obtained as a result of hydrogen delamination possesses higher purity, smaller size and number of defects, its surface is smooth and less developed after the transfer process to the target substrate.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1321-1326
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanofluid flow and heat transfer of carbon nanotube and graphene platelette nanofluids in entrance region of microchannels
    Autorzy:
    Fuller, N. E.
    Liu, J. T. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/38606230.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    nanofluids
    heat transfer
    carbon nanotube
    graphene nanoplatelettes
    Opis:
    Suspensions of nano-scale particles in liquids, dubbed nanofluids, are of great interest for heat transfer applications. Nanofluids potentially offer superior thermal conductivity to alternative, pure fluids and are of particular interest in applications where active cooling of power-dense systems is required. In this work, the thermophysical properties of carbon nanotube nanofluids (CNTNf) and those of graphene nanoplatelette nanofluids (GNPNf) as functions of particle volume fraction are deduced from published experiments. These properties are applied to a perturbative boundary layer model to examine how the velocity and temperature profiles (and correspondingly shear stress and surface heat transfer) vary with the nanoparticle concentration in the entrance region of microchannels. Findings of this modeling effort indicate that both shear stress and heat transfer in GNPNf increase with increasing particle concentration. The normalized increase in shear stress is approximately twice that for heat transfer as a function of the GNP particle concentration. Interestingly, CNTNf shows anti-enhancement heat transfer behaviour; an increasing concentration of CNT nanoparticles is associated with both an increase in shear stress and a decrease in the surface heat transfer rate.
    Źródło:
    Archives of Mechanics; 2020, 72, 4; 355-379
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transfer Matrix Approach to One-Dimensional Electron Transport in Graphene Sheets with Piecewise Constant Potentials
    Autorzy:
    Ghazanfari, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400412.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.ue
    72.80.vp
    75.70.cn
    Opis:
    We studied one-dimensional electron transport in a system composed of two monolayer graphene sheets with an optional arrangement of different constant rectangular electrostatic potential barriers between them. We derived a generalized transfer matrix for the electron which passes through this system. Finally, we examined our model by applying it on a well known rectangular shape constant potential barrier and we obtained the same result from our method similar to the others.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 148-151
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neurotransmitters detection using a fluorescence-based sensor with graphene quantum dots
    Autorzy:
    Baluta, S.
    Cabaj, J.
    Malecha, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/175014.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sensor
    dopamine
    fluorescence
    Förster resonance energy transfer
    quantum dots
    Opis:
    In the paper, the development and performance of an optical sensor for detection of neurotransmitters (dopamine) is presented. The concentration of dopamine is measured basing on fluorescence quenching of graphene quantum dots. In the sensor, the dopamine molecules coat the graphene quantum dots surface – in result, the quenching of fluorescence occurs due to the Förster resonance energy transfer. The changes in fluorescence correspond to specific concentrations of the neurotransmitter in tested samples, so it is possible to accurately determine the concentration of dopamine in the sample.
    Źródło:
    Optica Applicata; 2017, 47, 2; 225-231
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Vacancies on Electronic and Magnetic Properties of Hydrogen Passivated Graphene Nanoribbons
    Autorzy:
    Haffad, S.
    Benchallal, L.
    Lamiri, L.
    Boubenider, F.
    Zitoune, H.
    Kahouadji, B.
    Samah, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030793.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    DFT
    vacancies
    AGNR
    magnetic
    passivated
    electronic
    charge transfer
    band structure
    Opis:
    Using first-principles calculations we have demonstrated that electronic and magnetic properties of armchair graphene nanoribbons are modified by introducing vacancies defects. The equilibrium geometries, electronic, charge spin density distributions, electronic band structures, and magnetic moments were examined in the presence of vacancies. We have found that introducing vacancies into armchair graphene nanoribbons changes the spatial distribution of neighbor atoms, particularly those located around the vacancies. Our calculations showed that the vacancies have significant effect on the magnetization of armchair graphene nanoribbons. Magnetic moment values and electronic behavior in different configurations depend on the number of vacancies. These results suggest that vacancy defects can be used to modify the electronic and the magnetic properties of armchair graphene nanoribbons.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1307-1313
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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