Academic literature on the topic 'Graphene Quantum Sheets'

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Journal articles on the topic "Graphene Quantum Sheets"

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Flouris, Kyriakos, Miller Mendoza Jimenez, and Hans J. Herrmann. "Landau levels in wrinkled and rippled graphene sheets." International Journal of Modern Physics C 30, no. 10 (October 2019): 1941006. http://dx.doi.org/10.1142/s0129183119410067.

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We study the discrete energy spectrum of curved graphene sheets in the presence of a magnetic field. The shifting of the Landau levels is determined for complex and realistic geometries of curved graphene sheets. The energy levels follow a similar square root dependence on the energy quantum number as for rippled and flat graphene sheets. The Landau levels are shifted towards lower energies proportionally to the average deformation and the effect is larger compared to a simple uni-axially rippled geometry. Furthermore, the resistivity of wrinkled graphene sheets is calculated for different average space curvatures and shown to obey a linear relation. The study is carried out with a quantum lattice Boltzmann method, solving the Dirac equation on curved manifolds.
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Klimchitskaya, Galina L., and Vladimir M. Mostepanenko. "Casimir and Casimir-Polder Forces in Graphene Systems: Quantum Field Theoretical Description and Thermodynamics." Universe 6, no. 9 (September 9, 2020): 150. http://dx.doi.org/10.3390/universe6090150.

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We review recent results on the low-temperature behaviors of the Casimir-Polder and Casimir free energy an entropy for a polarizable atom interacting with a graphene sheet and for two graphene sheets, respectively. These results are discussed in the wide context of problems arising in the Lifshitz theory of van der Waals and Casimir forces when it is applied to metallic and dielectric bodies. After a brief treatment of different approaches to theoretical description of the electromagnetic response of graphene, we concentrate on the derivation of response function in the framework of thermal quantum field theory in the Matsubara formulation using the polarization tensor in (2 + 1)-dimensional space—time. The asymptotic expressions for the Casimir-Polder and Casimir free energy and entropy at low temperature, obtained with the polarization tensor, are presented for a pristine graphene as well as for graphene sheets possessing some nonzero energy gap Δ and chemical potential μ under different relationships between the values of Δ and μ. Along with reviewing the results obtained in the literature, we present some new findings concerning the case μ≠0, Δ=0. The conclusion is made that the Lifshitz theory of the Casimir and Casimir-Polder forces in graphene systems using the quantum field theoretical description of a pristine graphene, as well as real graphene sheets with Δ>2μ or Δ<2μ, is consistent with the requirements of thermodynamics. The case of graphene with Δ=2μ≠0 leads to an entropic anomaly, but is argued to be physically unrealistic. The way to a resolution of thermodynamic problems in the Lifshitz theory based on the results obtained for graphene is discussed.
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Wang, Jigang, Ji Zhou, Wenhua Zhou, Jilong Shi, Lun Ma, Wei Chen, Yongsheng Wang, Dawei He, Ming Fu, and Yongna Zhang. "Synthesis, Photoluminescence and Bio-Targeting Applications of Blue Graphene Quantum Dots." Journal of Nanoscience and Nanotechnology 16, no. 4 (April 1, 2016): 3457–67. http://dx.doi.org/10.1166/jnn.2016.11817.

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Chemical derived graphene oxide, an atomically thin sheet of graphite with two-dimensional construction, offers interesting physical, electronic, thermal, chemical, and mechanical properties that are currently being explored for advanced physics electronics, membranes, and composites. Herein, we study graphene quantum dots (GQD) with the blue photoluminescence under various parameters. The GQD samples were prepared at different temperatures, and the blue photoluminescence intensity of the solution improved radically as the heating temperatures increased. Concerning PL peak and intensity of the quantum dots, the results demonstrated dependence on time under heating, temperature of heating, and pH adjusted by the addition of sodium hydroxide. After hydrothermal synthesis routes, the functional groups of graphene oxide were altered the morphology showed the stacking configuration, and self-assembled structure of the graphene sheets with obvious wrinkles appeared at the edge structures. In addition, absorption, PL, and PLE spectra of the graphene quantum dots increase with different quantities of sodium hydroxide added. Finally, using GQD to target PNTIA cells was carried out successfully. High uptake efficiency and no cytotoxic effects indicate graphene quantum dots can be suitable for bio-targeting.
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Hassanien, Ahmed S., Radwa A. Shedeed, and Nageh K. Allam. "Graphene Quantum Sheets with Multiband Emission: Unravelling the Molecular Origin of Graphene Quantum Dots." Journal of Physical Chemistry C 120, no. 38 (September 13, 2016): 21678–84. http://dx.doi.org/10.1021/acs.jpcc.6b07593.

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Kanodarwala, Fehmida K., Fan Wang, Peter J. Reece, and John A. Stride. "Deposition of CdSe quantum dots on graphene sheets." Journal of Luminescence 146 (February 2014): 46–52. http://dx.doi.org/10.1016/j.jlumin.2013.08.072.

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Flouris, Kyriakos, Sauro Succi, and Hans J. Herrmann. "Quantized Alternate Current on Curved Graphene." Condensed Matter 4, no. 2 (April 9, 2019): 39. http://dx.doi.org/10.3390/condmat4020039.

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Based on the numerical solution of the Quantum Lattice Boltzmann Method in curved space, we predicted the onset of a quantized alternating current on curved graphene sheets. This numerical prediction was verified analytically via a set of semi-classical equations that related the Berry curvature to real space curvature. The proposed quantized oscillating current on curved graphene could form the basis for the implementation of quantum information-processing algorithms.
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Sim, Uk, Joonhee Moon, Junghyun An, Jin Hyoun Kang, Sung Eun Jerng, Junsang Moon, Sung-Pyo Cho, Byung Hee Hong, and Ki Tae Nam. "N-doped graphene quantum sheets on silicon nanowire photocathodes for hydrogen production." Energy & Environmental Science 8, no. 4 (2015): 1329–38. http://dx.doi.org/10.1039/c4ee03607g.

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Zeng, Minxiang, Xuezhen Wang, Yi-Hsien Yu, Lecheng Zhang, Wakaas Shafi, Xiayun Huang, and Zhengdong Cheng. "The Synthesis of Amphiphilic Luminescent Graphene Quantum Dot and Its Application in Miniemulsion Polymerization." Journal of Nanomaterials 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/6490383.

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Although emulsion applications of microscale graphene sheets have attracted much attention recently, nanoscale graphene platelets, namely, graphene quantum dots (GQDs), have been rarely explored in interface science. In this work, we study the interfacial behaviors and emulsion phase diagrams of hydrophobic-functionalized graphene quantum dots (C18-GQDs). Distinctive from pristine graphene quantum dots (p-GQDs), C18-GQDs show several interesting surface-active properties including high emulsification efficiency in stabilizing dodecane-in-water emulsions. We then utilize the C18-GQDs as surfactants in miniemulsion polymerization of styrene, achieving uniform and relatively small polystyrene nanospheres. The high emulsification efficiency, low production cost, uniform morphology, intriguing photoluminescence, and extraordinary stability render C18-GQDs an attractive alternative in surfactant applications.
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Dehestani, Maryam, Leila Zeidabadinejad, and Sedigheh Pourestarabadi. "QTAIM investigations of decorated graphyne and boron nitride for Li detection." Journal of the Serbian Chemical Society 82, no. 3 (2017): 289–301. http://dx.doi.org/10.2298/jsc160725012d.

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The interactions between thirteen Li atoms and graphyne (GY) and boron nitride (BN-yne) were investigated by the density functional theory (DFT). The electronic and structural properties of the interactions between the hollow sites of GY and BN-yne with Li atoms were unveiled within the quantum theory of atoms in molecules (QTAIM) framework. Theoretical understanding of the interactions between Li atoms and extended carbon-based network structures is crucial for the development of new materials. Herein, calculations to explore the impact of Li decoration on the GY and BN-yne are reported. It was predicted that Li decoration would increase the density of state of these sheets. Owing to strong interactions between Li and the GY and BNyne, dramatic changes in the electronic properties of the sheets together with large band gap variations have been observed. The present study sheds deep insight into the chemical properties of the novel carbon?based two-dimensional (2D) structures beyond the graphene sheet.
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Govindhan, Maduraiveeran, Brennan Mao, and Aicheng Chen. "Novel cobalt quantum dot/graphene nanocomposites as highly efficient electrocatalysts for water splitting." Nanoscale 8, no. 3 (2016): 1485–92. http://dx.doi.org/10.1039/c5nr06726j.

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Books on the topic "Graphene Quantum Sheets"

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Horing, Norman J. Morgenstern. Graphene. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0012.

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Chapter 12 introduces Graphene, which is a two-dimensional “Dirac-like” material in the sense that its energy spectrum resembles that of a relativistic electron/positron (hole) described by the Dirac equation (having zero mass in this case). Its device-friendly properties of high electron mobility and excellent sensitivity as a sensor have attracted a huge world-wide research effort since its discovery about ten years ago. Here, the associated retarded Graphene Green’s function is treated and the dynamic, non-local dielectric function is discussed in the degenerate limit. The effects of a quantizing magnetic field on the Green’s function of a Graphene sheet and on its energy spectrum are derived in detail: Also the magnetic-field Green’s function and energy spectrum of a Graphene sheet with a quantum dot (modelled by a 2D Dirac delta-function potential) are thoroughly examined. Furthermore, Chapter 12 similarly addresses the problem of a Graphene anti-dot lattice in a magnetic field, discussing the Green’s function for propagation along the lattice axis, with a formulation of the associated eigen-energy dispersion relation. Finally, magnetic Landau quantization effects on the statistical thermodynamics of Graphene, including its Free Energy and magnetic moment, are also treated in Chapter 12 and are seen to exhibit magnetic oscillatory features.
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Book chapters on the topic "Graphene Quantum Sheets"

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Szpak, Nikodem. "A Sheet of Graphene: Quantum Field in a Discrete Curved Space." In Springer Proceedings in Physics, 583–90. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06761-2_82.

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Pattanaik, S. R., Sriyanka Behera, and G. N. Dash. "Calculation of Quantum Capacitance and Sheet Carrier Density of Graphene FETs." In Springer Proceedings in Physics, 15–20. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-97604-4_3.

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"Quantum Capacitance of Graphene Sheets and Nanoribbons." In Graphene Science Handbook, 189–202. CRC Press, 2016. http://dx.doi.org/10.1201/b19460-18.

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"- CVD of Carbon Nanomaterials: From Graphene Sheets to Graphene Quantum Dots." In Chemical Functionalization of Carbon Nanomaterials, 1000–1033. CRC Press, 2015. http://dx.doi.org/10.1201/b18724-50.

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Muñoz, Roberto, Mar García-Hernández, and Cristina Gómez-Aleixandre. "CVD of Carbon Nanomaterials: From Graphene Sheets to Graphene Quantum Dots." In Handbook of Carbon Nano Materials, 127–83. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814678919_0004.

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Balachandran, Manoj. "Extraction of Preformed Mixed Phase Graphene Sheets from Graphitized Coal by Fungal Leaching." In Handbook of Research on Inventive Bioremediation Techniques, 287–99. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2325-3.ch012.

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The potential use of coal as source of carbon nano structure is seldom investigated. Herein we report a facile fungal solubilization method to extract mixed phase carbon structure from low grade coal. Coal had been used as a primary source for the production of carbon nanostructure with novel property, in addition to its main utility as a fuel. The major hurdle in its application is the inherent mineral embedded in it. An environmentally benign demineralization procedure make coal as a widely accepted precursor for the novel carbon materials. With Aspergiilus niger leaching, the randomly oriented preformed crystalline mixed phase nanocarbon in coal can be extracted. Raman studies revealed the presence of E2g scattering mode of graphite. The sp3 domains at ~1355 cm-1 (D band) is an indication of diamond like structure with disorder or defect. In the 2D region, multilayer stacking of graphene layers is noticed. The ratio of the defect to graphitic bands was found to be decreasing with increasing rank of coal. Bio leaching of coal enhances the carbon content in coal while eliminating the associated minerals in it. These defected carbon is an ideal material for graphene quantum dots and carbon dots, which are useful in drug delivery and bio imaging applications.
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"Phase Transition in CdSe Quantum Dots and Deposition of CdSe Quantum Dots on Graphene Sheets." In Nanomaterials, 224–51. Jenny Stanford Publishing, 2016. http://dx.doi.org/10.1201/b20041-9.

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Gençdağ Şensoy, Kübra, and Mihrican Muti. "The Novel Nanomaterials Based Biosensors and Their Applications." In Novel Nanomaterials [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94930.

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Since the development of the first biosensor reported, biosensor has received considerable attention due to its high selectivity and sensitivity. Biosensors are highly pursued in order to meet the growing demands and challenges in a large number of analytic applications such as medical diagnosis, food safety control, environmental monitoring, or even military defense. Due to the unique physical, chemical, mechanical and electrical properties, nanomaterials have been widely investigated for their ability and used to fabricate sensors. High surface to volume ratio, good stability, excellent electrocatalytic properties of the nanomaterials plays an important role in the sensitive and selective detection of biomolecules. The synthesis of new nanomaterials with different properties is increasingly common in order to improve these counted properties of nanomaterials. This chapter gives an overview of the importance of the development of novel nanomaterials based biosensors technologies. The use of different funtionalized carbon nanomaterilas, metal oxide nanoparticles, metal nanoparticles, polymeric nanoparticles, quantum dots, graphene sheets and other novel nanomaterials in biosensor technology, and their innovations and advantages are discussed.
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Conference papers on the topic "Graphene Quantum Sheets"

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Das, Ruma, and P. K. Giri. "Fluorescence based comparative study of interaction of perylene with nitrogen doped graphene quantum dots and graphene oxide sheets." In THE 3RD INTERNATIONAL CONFERENCE ON OPTOELECTRONIC AND NANO MATERIALS FOR ADVANCED TECHNOLOGY (icONMAT 2019). Author(s), 2019. http://dx.doi.org/10.1063/1.5093848.

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Torres-Mendieta, Rafael, David Ventura-Espinosa, Sara Sabater, Jesus Lancis, Jose A. Mata, and Gladys Minguez-Vega. "In-situ metal nanoparticle decoration on graphene sheets by Pulsed Laser Ablation in Liquids." In 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2017. http://dx.doi.org/10.1109/cleoe-eqec.2017.8087291.

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Ohnishi, Masato, Katsuya Ohsaki, Yusuke Suzuki, Ken Suzuki, and Hideo Miura. "Nanostructure Dependence of the Electronic Conductivity of Carbon Nanotubes and Graphene Sheets." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37277.

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In this study, the change of the resistivity of the CNT-dispersed resin was analyzed by applying a quantum chemical molecular dynamics and the first principle calculation. Various combinations of double-walled carbon nanotube structures were modeled for the analysis. The change of the band structure was calculated by changing the amplitude of the applied strain. It was found in some cases that the band structure changes drastically from a metallic structure to a semiconductive structure, and this result clearly indicated that the electronic conductivity of this MWCNT decreased significantly under tensile strain. It was also found that further application of the strain made a band gap in the band structure. This result indicated that the metallic CNT changes a semiconductive CNT due to the applied strain. The effect of the diameter of the zigzag type CNT on the critical strain of buckling deformation was analyzed under a uni-axial strain. In this analysis, the aspect ratio of each structure was fixed at 10. It was found that the critical strain decreased monotonically with the increase of the diameter. This was because that the flexural rigidity of a cylinder decreased with the increase of its diameter when the thickness of the wall of the cylinder is fixed. It was found that the critical strain decreased drastically from about 5% to 0.5% when the aspect ratio was changed from 10 to 30. Since the typical aspect ratio of CNTs often exceeds 1000, most CNTs show buckling deformation when an axial compressive strain was applied to the CNTs. Finally, the shape of six-membered ring of the CNT was found to be the dominant factor that determines the electronic band structure of a CNT. Next, the change of the band structure of a graphene sheet was analyzed by applying the abinitio calculation (Density functional theory). It was found that the fluctuation of the atomic distance among the six-membered ring is the most dominant factor of the electronic band structure. When the fluctuation exceeded about 10%, band gap appeared in the deformed six-membered ring, and thus, the electronic conductivity of the graphene sheet changes from metallic one to semiconductive one. It is therefore, possible to predict the change of the electronic conductivity of a CNT by considering the local shape of a six-membered ring in the deformed CNT.
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Ohnishi, Masato, Yusuke Suzuki, Yusuke Ohashi, Ken Suzuki, and Hideo Miura. "Change of the Electronic Conductivity of Carbon Nanotube and Graphene Sheets Caused by a Three-Dimensional Strain Field." In ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/ipack2011-52057.

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In this study, the change of the resistivity of carbon nanotubes and graphene sheets under strain was analyzed by applying a quantum chemical molecular dynamics analysis and the first principle calculation. Various combinations of double-walled carbon nanotube structures were modeled for the analysis. The change of the band structure was calculated by changing the amplitude of the applied strain. It was found in some cases that the band structure changes drastically from metallic band structure to semiconductive one, and this result clearly indicated that the electronic conductivity of the MWCNT decreased significantly in a three-dimensional strain field. It was also found that there is a critical strain at which the electronic band structure changes from metallic to semiconductive and vice versa. This result indicated that the metallic CNT changes a semiconductive CNT depending on the applied strain field. The effect of the diameter of the zigzag type CNT on the critical strain of buckling deformation was analyzed under uni-axial strain. In this analysis, the aspect ratio of each structure was fixed at 10. It was found that the critical strain decreased monotonically with the decrease of the diameter. This was because that the flexural rigidity of a cylinder decreased with the decrease of its diameter when the thickness of the wall of the cylinder was fixed. It was found that the critical strain decreased drastically from about 5% to 0.5% when the aspect ratio was changed from 10 to 30. Since the typical aspect ratio of CNTs often exceeds 1000, most CNTs should show buckling deformation when an axial compressive strain is applied to the CNTs. Finally, the shape of a six-membered ring of the CNT was found to be the dominant factor that determines the electronic band structure of a CNT. The change of the band structure of a grapheme sheet was analyzed by applying the abinitio calculation based on density functional theory. It was found that the fluctuation of the atomic distance among the six-membered ring is the most dominant factor of the electronic band structure. When the fluctuation exceeded about 10%, band gap appeared in the deformed six-membered ring, and thus, the electronic conductivity of the grapheme sheet change from metallic one to semiconductive one. It is therefore, possible to predict the change of the electronic conductivity of a CNT by considering the local shape of a six-membered ring in the deformed CNT.
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Zimmermann, Kristen A., Jianfei Zhang, Harry Dorn, Christopher Rylander, and Marissa Nichole Rylander. "Synthesis and Cytotoxicity Analysis of Carbon Nanohorn-Quantum Dot Complexes." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53968.

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Carbon nanoparticles have the potential to significantly impact the medical field over the next decade. Currently, carbon nanoparticles are being studied for a myriad of applications, including drug delivery, selective laser therapy, imaging, and biosensing. The most common type of carbon particles being investigated are carbon nanotubes (CNTs). CNTs are attractive materials for medical applications because of their physical properties and the ease with which they can be surface modified; however, there is a great deal of controversy over their possible toxicity. A more novel type of CNT that was discovered in 1999 by Iijima et al. is the carbon nanohorn [1]. Individual single-walled nanohorns (SWNHs) are single graphene sheets that roll into a conical open ended structure. The open ends of these cones are then attracted to one another through van der Waals interactions and form a flower-like final structure [2]. SWNHs are more favorable for medical applications because they are produced without the use of metal catalysts abating the concern of toxicity associated with CNTs.
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Cassiano, Tiago de Sousa Araújo, Fábio Ferreira Monteiro, and Pedro Henrique de Oliveira Neto. "Unveiling the Dynamics of Quasiparticles in Cove-type Graphene Nanoribbons." In VIII Simpósio de Estrutura Eletrônica e Dinâmica Molecular. Universidade de Brasília, 2020. http://dx.doi.org/10.21826/viiiseedmol202074.

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Since its isolation in 2004, graphene has attracted the attention of many scientists due to its excellent transport and mechanical features. However, the use of this material in optoelectronics is limited since it has no bandgap. One can detour it by cutting a graphene sheet laterally. The new carbon nanostructure that emerges from this procedure is known as graphene nanoribbon (GNR). Nowadays, a quest to develop a viable production of these materials drives many researchers. Narita et al.[2] successfully synthesized a candidate using a bottom-up solution procedure, known as cove-type GNR. Despite all the promising attributes, the electronic transport mechanism of this material is so far unexplored. In this work, we investigated through computational simulations the electronic transport of the cove-type GNR. We did so by employing an extended two-dimensional SSH model [3] with a tight-binding effect (electron-phonon coupling). A self-consistent field method generates stationary states, while time evolution is conducted based on the Ehrenfest theorem. Results reveal the formation of two polarized regions after photoionization: a polaron and a bipolaron. These quasiparticles are mobile by the application of a uniform electric field, unveiling its role as a charge transporter. Finally, a semi-classical algorithm evaluates their mobility and effective mass. Calculations indicate that both structures have a low effective mass along with intrinsic mobility. Hence, the cove-type GNRs may be suitable to perform as highly efficient semiconductors in future applications. This study contributes as well to the theoretical understanding of confined quantum systems.
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