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Articles de revues sur le sujet « Graphene Nanostructure - Photophysical Properties »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Ardoña, Herdeline Ann M., Kalpana Besar, Matteo Togninalli, Howard E. Katz et John D. Tovar. « Sequence-dependent mechanical, photophysical and electrical properties of pi-conjugated peptide hydrogelators ». Journal of Materials Chemistry C 3, no 25 (2015) : 6505–14. http://dx.doi.org/10.1039/c5tc00100e.

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Reznik, Ivan, Andrey Zlatov, Mikhail Baranov, Roman Zakoldaev, Andrey Veniaminov, Stanislav Moshkalev et Anna Orlova. « Photophysical Properties of Multilayer Graphene–Quantum Dots Hybrid Structures ». Nanomaterials 10, no 4 (9 avril 2020) : 714. http://dx.doi.org/10.3390/nano10040714.

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Photoelectrical and photoluminescent properties of multilayer graphene (MLG)–quantum dots (QD) hybrid structures have been studied. It has been shown that the average rate of transfer from QDs to the MLG can be estimated via photoinduced processes on the QDs’ surfaces. A monolayer of CdSe QDs can double the photoresponse amplitude of multilayer graphene, without influencing its characteristic photoresponse time. It has been found that efficient charge or energy transfer from QDs to MLG with a rate higher than 3 × 108 s−1 strongly inhibits photoinduced processes on the QD surfaces and provides photostability for QD-based structures.
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Zhang, Fan, Ruilin Man, Zhiyuan Peng et Zhibo Liu. « Synthesis, Characterization and Photophysical Properties of Graphene-Phthalocyanine Hybrid ». Asian Journal of Chemistry 26, no 15 (2014) : 4819–26. http://dx.doi.org/10.14233/ajchem.2014.16241.

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Joseph, J., et Y. C. Lu. « Effect of graphene layer thickness on effective modulus of 3D CNT/Graphene nanostructures ». International Journal of Computational Materials Science and Engineering 04, no 02 (juin 2015) : 1550010. http://dx.doi.org/10.1142/s2047684115500104.

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Three-dimensional CNT/Graphene nanostructure is consisted of vertically aligned carbon nanotube pillars grown directly on parallel graphene layers. The effect of graphene layer thickness on mechanical properties of the 3D nanostructure is analyzed. Overall, when the graphene layers experience the out-of-plane loading, the effective properties (Young's modulus, shear modulus, and major Poisson's ratio) of the 3D CNT/Graphene structure are significantly dependent upon the thickness of graphene layers. When the graphene layers experience the in-plane loading, the effective properties of the 3D CNT/Graphene structure depend upon the graphene thickness initially and then remain relatively unchanged as the thickness increases. It is found that the optimal performance of the 3D CNT/Graphene structure requires a minimum of thickness for the graphene layers, g/t > 5.
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Zeng, B., Z. G. Li et W. J. Zeng. « N-doped graphene-cadmium sulfide nanoplates and their improved photocatalytic performance ». Digest Journal of Nanomaterials and Biostructures 16, no 2 (2021) : 627–33. http://dx.doi.org/10.15251/djnb.2021.162.627.

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Cadmium sulfide nanoplates and N-doped graphene composites (CdS NP/NG) were synthesized for use as photocatalysts. Photocatalytic testing showed that both the two dimensional (2D) nanostructure and nitrogen-doping of graphene contributed to its excellent photocatalytic performance. Here, the 2D nanostructure provided a large number of active sites and the nitrogen-doping of graphene could improve its electronic properties. This work offers a new insight for obtaining a highly efficient CdS/graphene photocatalyst.
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Wibmer, Leonie, Leandro M. O. Lourenço, Alexandra Roth, Georgios Katsukis, Maria G. P. M. S. Neves, José A. S. Cavaleiro, João P. C. Tomé, Tomás Torres et Dirk M. Guldi. « Decorating graphene nanosheets with electron accepting pyridyl-phthalocyanines ». Nanoscale 7, no 13 (2015) : 5674–82. http://dx.doi.org/10.1039/c4nr05719h.

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Kim, Jinsang. « Assemblies of conjugated polymers : Intermolecular and intramolecular effects on the photophysical properties of conjugated polymers ». Pure and Applied Chemistry 74, no 11 (1 janvier 2002) : 2031–44. http://dx.doi.org/10.1351/pac200274112031.

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Conjugated polymers are emerging materials for electronic applications due to the tunability of their properties through variation of their chemical structure. Their applications, which currently include light-emitting diodes (LEDs), field effect transistors (FETs), plastic lasers, batteries, and sensors, are expanding to many new areas. The two critical parameters that determine the function of conjugated polymer-based devices are chemical structure and nanostructure of a conjugated polymer in the solid state. While the physical properties of isolated polymers are primarily controlled by their chemical structure, these properties are drastically altered in the solid state due to electronic coupling between polymer chains as determined by their interpolymer packing and conformation. However, the development of effective and precise methods for controlling the nanostructure of polymers in the solid state has been limited because polymers often fail to assemble into organized structures due to their amorphous character and large molecular weight.In this review, recent developments of organizing methods of conjugated polymers and the conformation and interpolymer interaction effects on the photophysical properties of conjugated polymers are summarized.
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Ozcan, Sefika, Sesha Vempati, Ali Çırpan et Tamer Uyar. « Associative behaviour and effect of functional groups on the fluorescence of graphene oxide ». Physical Chemistry Chemical Physics 20, no 11 (2018) : 7559–69. http://dx.doi.org/10.1039/c7cp08334c.

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We juxtaposed structural, vibrational and emission properties of graphene oxide with and without a model dispersant. This unveiled a strong associative behavior between graphene oxide sheets and the effect of H-bonds on the photophysical properties.
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Debgupta, Joyashish, Sadananda Mandal, Hemen Kalita, Mohammed Aslam, Amitava Patra et Vijayamohanan Pillai. « Photophysical and photoconductivity properties of thiol-functionalized graphene–CdSe QD composites ». RSC Advances 4, no 27 (2014) : 13788. http://dx.doi.org/10.1039/c3ra47420h.

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Fernandes, Flaviano Williams, Vitor Fernando Gigante de Paiva et Gilmar Patrocínio Thim. « Energetic and electronic properties in a multilayered ZnO graphene-like nanostructure ». Materials Research 19, no 3 (28 mars 2016) : 497–504. http://dx.doi.org/10.1590/1980-5373-mr-2015-0432.

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Sasaki, Ryo, et Kazuhito Shintani. « GS0312 Analysis of the mechanical properties of a pillared-graphene nanostructure ». Proceedings of Conference of Kanto Branch 2016.22 (2016) : _GS0312–1_—_GS0312–2_. http://dx.doi.org/10.1299/jsmekanto.2016.22._gs0312-1_.

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Komatsu, Teruyuki, Miho Moritake, Akito Nakagawa et Eishun Tsuchida. « Self-Organized Lipid-Porphyrin Bilayer Membranes in Vesicular Form : Nanostructure, Photophysical Properties, and Dioxygen Coordination ». Chemistry - A European Journal 8, no 23 (2 décembre 2002) : 5469–80. http://dx.doi.org/10.1002/1521-3765(20021202)8:23<5469 ::aid-chem5469>3.0.co;2-1.

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Karousis, Nikolaos, Atula S. D. Sandanayaka, Taku Hasobe, Solon P. Economopoulos, Evangelia Sarantopoulou et Nikos Tagmatarchis. « Graphene oxide with covalently linked porphyrin antennae : Synthesis, characterization and photophysical properties ». J. Mater. Chem. 21, no 1 (2011) : 109–17. http://dx.doi.org/10.1039/c0jm00991a.

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Nwahara, Nnamdi, Reitumetse Nkhahle, Bokolombe P. Ngoy, John Mack et Tebello Nyokong. « Synthesis and photophysical properties of BODIPY-decorated graphene quantum dot–phthalocyanine conjugates ». New Journal of Chemistry 42, no 8 (2018) : 6051–61. http://dx.doi.org/10.1039/c8nj00758f.

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Tamm, Aile, Tauno Kahro, Helle-Mai Piirsoo et Taivo Jõgiaas. « Atomic-Layer-Deposition-Made Very Thin Layer of Al2O3, Improves the Young’s Modulus of Graphene ». Applied Sciences 12, no 5 (27 février 2022) : 2491. http://dx.doi.org/10.3390/app12052491.

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Nanostructures with graphene make them highly promising for nanoelectronics, memristor devices, nanosensors and electrodes for energy storage. In some devices the mechanical properties of graphene are important. Therefore, nanoindentation has been used to measure the mechanical properties of polycrystalline graphene in a nanostructure containing metal oxide and graphene. In this study the graphene was transferred, prior to the deposition of the metal oxide overlayers, to the Si/SiO2 substrate were SiO2 thickness was 300 nm. The atomic layer deposition (ALD) process for making a very thin film of Al2O3 (thickness comparable with graphene) was applied to improve the elasticity of graphene. For the alumina film the Al(CH3)3 and H2O were used as the precursors. According to the micro-Raman analysis, after the Al2O3 deposition process, the G-and 2D-bands of graphene slightly broadened but the overall quality did not change (D-band was mostly absent). The chosen process did not decrease the graphene quality and the improvement in elastic modulus is significant. In case the load was 10 mN, the Young’s modulus of Si/SiO2/Graphene nanostructure was 96 GPa and after 5 ALD cycles of Al2O3 on graphene (Si/SiO2/Graphene/Al2O3) it increased up to 125 GPa. Our work highlights the correlation between nanoindentation and defects appearance in graphene.
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Li, Jia Ye, Jin Feng Zhu et Qing H. Liu. « Tunable Properties of Three-Dimensional Graphene-Loaded Plasmonic Absorber Using Plasmonic Nanoparticles ». Materials Science Forum 860 (juillet 2016) : 29–34. http://dx.doi.org/10.4028/www.scientific.net/msf.860.29.

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We demonstrate a three-dimensional nanostructure design by combining graphene and conventional plasmonic nanostructures, to achieve the high absorbance in the visible region. Furthermore, the peak position and bandwidth of graphene absorption spectra are tunable in a wide wavelength range through a specific structural configuration. Comparing the results of two structures which is based on different materials, Gold and Silver. The structure made of Silver present a better performance. These results imply that graphene in combination with plasmonic perfect absorbers have a promising potential for developing advanced nanophotonic devices.
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Managa, Muthumuni, Bokolombe Pitchou Ngoy et Tebello Nyokong. « Photophysical properties and photodynamic therapy activity of ameso-tetra(4-carboxyphenyl)porphyrin tetramethyl ester–graphene quantum dot conjugate ». New Journal of Chemistry 43, no 11 (2019) : 4518–24. http://dx.doi.org/10.1039/c8nj06175k.

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Ameso-tetra(4-carboxyphenyl)porphyrin tetramethyl ester and the Zn and GaCl derivatives were π–π stacked with graphene quantum dots to form conjugates and their photophysical and photodynamic therapy properties were investigated.
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Sergeyev, D., A. Duisenova et Zh Embergenov. « Modeling of electrotransport properties of Li-intercalated graphene film ». Journal of Physics : Conference Series 2140, no 1 (1 décembre 2021) : 012025. http://dx.doi.org/10.1088/1742-6596/2140/1/012025.

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Abstract In this work, within the framework of density functional theory combined with the method of nonequilibrium Green’s functions the density of states, transmission spectrum, current-voltage characteristics, and differential conductivity of Li-intercalated graphene (LiC6) have been determined. It is shown that in the energy range of -1.3÷-1.05 eV the quasiparticle transport through the nanostructure is disable. The features of IV- and dI/dV-characteristics of LiC6 in the form of decreasing of resistance in the range of -0.4÷0.4 V were revealed, and in the interval of 0.4÷1.4 V formation of negative differential resistance area, related to scattering of quasiparticles. It is established, that LiC6 nanodevice has 12÷13 ballistic channels and has the maximum amount of conductance 12÷13G0 , where Go is the conductance quantum.
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Torres, Tomas, Elisa López-Serrano, Marta Gomez-Gomez, Luis M. Mateo, Jorge Labella, Giovanni Bottari et Mine Ince. « (Invited) Porphyrinoid-Carbon Nanostructure Ensembles and Fused Porphyrin-Graphene Nanoribbons ». ECS Meeting Abstracts MA2022-01, no 11 (7 juillet 2022) : 828. http://dx.doi.org/10.1149/ma2022-0111828mtgabs.

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Phthalocyanines (Pcs) have emerged as excellent light harvesting antennas for incorporation into D-A systems, mainly in connection with carbon nanostructures, like endohedral metallofullerenes, SWCNT and graphene, as acceptor or donor moieties, in which the Pc has been attached, covalently or through supramolecular interactions. They are among the few molecules that reveal an intense red and NIR absorption and therefore, constitute also promising dyes in molecular photovoltaics. Pcs have a great chemical versatility, which allows to modify their electronic character and their physicochemical properties by organic synthesis, by introducing substituents in the periphery or modifying the structure of the macrocycle. Most recently they have reached good efficiency values participating as hole transporting materials in Carbon-based Perovskite sensitized solar cells (PSSCs). Pcs are be appropriately designed to adapt well to the electronic levels of the different types of perovskites. Through a rational design, structure-property relationships will be established that will gradually improve the performance of the devices. On the other hand, on-surface synthesis offers a versatile approach to fabricate novel carbon-based nanostructures that cannot be obtained via conventional solution chemistry. Within the family of such nanomaterials, graphene nanoribbons (GNRs) hold a privileged position due to their high potential for different applications. One of the key issues for their application in molecular electronics lies in the fine-tuning of their electronic properties through structural modifications, such as heteroatom doping or the incorporation of non-benzenoid rings. In this context, the covalent fusion of GNRs and porphyrins (Pors) represents a highly appealing strategy.
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Zhao, Ming, Lizhu Liu, Bin Zhang, Mingming Sun, Xugang Zhang, Xue Zhang, Jianhui Li et Lei Wang. « Epoxy composites with functionalized molybdenum disulfide nanoplatelet additives ». RSC Advances 8, no 61 (2018) : 35170–78. http://dx.doi.org/10.1039/c8ra07448h.

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As a typical layered inorganic analogue of graphene, molybdenum disulfide (MoS2) has gained intensive attention and become a research hotspot due to its unique two dimensional nanostructure and excellent properties.
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Liu, Xiaoting, Tianrui Chen, Hao Liang, Faxiang Qin, Hui Yang et Xingzhong Guo. « Facile approach for a robust graphene/silver nanowires aerogel with high-performance electromagnetic interference shielding ». RSC Advances 9, no 1 (2019) : 27–33. http://dx.doi.org/10.1039/c8ra08738e.

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We report a facile, eco-friendly approach to prepare the robust graphene/silver nanowires aerogel with high compressive strength and excellent EMI shielding performance due to its unique nanostructure and good electrical properties.
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Adorinni, Simone, Maria C. Cringoli, Siglinda Perathoner, Paolo Fornasiero et Silvia Marchesan. « Green Approaches to Carbon Nanostructure-Based Biomaterials ». Applied Sciences 11, no 6 (11 mars 2021) : 2490. http://dx.doi.org/10.3390/app11062490.

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The family of carbon nanostructures comprises several members, such as fullerenes, nano-onions, nanodots, nanodiamonds, nanohorns, nanotubes, and graphene-based materials. Their unique electronic properties have attracted great interest for their highly innovative potential in nanomedicine. However, their hydrophobic nature often requires organic solvents for their dispersibility and processing. In this review, we describe the green approaches that have been developed to produce and functionalize carbon nanomaterials for biomedical applications, with a special focus on the very latest reports.
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Kim, Wonbin, Hong-Joon Lee, Zubair Ahmad, Seung Jo Yoo, Youn-Joong Kim, Santosh Kumar, Mohammad Changez, Jung-Soo Lee et Jae-Suk Lee. « Growth of close-packed crystalline polypyrrole on graphene oxide via in situ polymerization of two-monomer-connected precursors ». Nanoscale 11, no 33 (2019) : 15641–46. http://dx.doi.org/10.1039/c9nr05398k.

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Li, Ruizhi, Mrityunjay Kothari, Alexander K. Landauer, Moon-Hyun Cha, Heemin Kwon et Kyung-Suk Kim. « A New Subcritical Nanostructure of Graphene—Crinkle-Ruga Structure and Its Novel Properties ». MRS Advances 3, no 45-46 (2018) : 2763–69. http://dx.doi.org/10.1557/adv.2018.432.

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AbstractHere, we report an experimental characterization of a new subcritical graphene nanostructure termed a crinkle ruga. Multilayer graphene forms crinkles as a periodic mode of buckling if the ratio of periodic buckling span to thickness is smaller than a critical value. Otherwise, it forms wrinkles. The crinkles have sawtooth-shaped profiles with their faces perfectly flat and the tips of the peaks and valleys highly curved. Our AFM measurements show that the width of the curvature focusing band at the tip is very narrow, e.g. smaller than 16 nm for a 6o crinkle, indicating a strong influence of flexoelectric coupling in crinkle formation. We also found that concavity or convexity of crinkle tips, i.e. parity of the crinkle, can be controlled. Due to the flexoelectric coupling, the concave tip at the crinkle valley is positively charged, and the convex tip at the crinkle peak negatively charged. In addition, here, we demonstrate that the charges at the crinkle tips can attract macromolecules in adsorption experiments. We show linearly-aligned adsorption of C60 along crinkle valleys on an HOPG surface. In another experiment, we exhibit period-doubled adsorption of lambda DNA on an HOPG surface, possibly caused by ion kinetics involved in the DNA adsorption along the crinkle valleys.
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Seel, Max, et Ravindra Pandey. « Electronic and quantum transport properties of a graphene-BN dot-ring hetero-nanostructure ». Journal of Physics Communications 2, no 4 (3 avril 2018) : 045003. http://dx.doi.org/10.1088/2399-6528/aab7df.

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Ma, Yongshan, Fengxia Zhang, Tianyi Jiang, Huixue Ren, Xiaofeng Wei, Yanyan Zhu et Xianqiang Huang. « Photophysical, electrochemical, self-assembly, and molecular packing properties of a sulfur-decorated perylene derivative ». Canadian Journal of Chemistry 97, no 11 (novembre 2019) : 780–87. http://dx.doi.org/10.1139/cjc-2019-0098.

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A sulfur-decorated perylene derivative, 1-propanethiol-N,N′-dicyclohexyl perylene-3,4,9,10 tetracarboxylic diimide (PTPDI), was synthesized and fully characterized by 1H NMR, 13C NMR, FTIR, HRMS, UV–vis absorption, fluorescence, fluorescence lifetime, fluorescence quantum yield, cyclic voltammetry, and thermogravimetric techniques. The optical, fluorescence, and scanning electron microscopies were employed to study its self-assembly process. The photophysical properties were affected strongly by modifying the propanethiol unit linking to the perylene core. Furthermore, the chromophore showed two irreversible oxidations and two quasi-reversible reductions in dichloromethane at modest potential. The optical properties of PTPDI in various conditions and complementary density functional theory calculations were reported. Due to steric hindrance of the bulky n-propyl mercaptan substituent, PTPDI molecules are arranged in slipped face-to-face fashion to form J-aggregates. Thus, the intermolecular π–π actions of the molecule are weak, causing its high luminescence efficiency. In the meantime, the space between perylene cores is very short (3.45 Å), which is favorable for the hopping transportation of charge carrier from one molecule to an adjacent one. PTPDI could be a candidate material for acquiring a well-defined organic nanostructure with excellent charge-transporting and light-emitting capabilities.
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Fujii, Shintaro, Maxim Ziatdinov, Misako Ohtsuka, Koichi Kusakabe, Manabu Kiguchi et Toshiaki Enoki. « Role of edge geometry and chemistry in the electronic properties of graphene nanostructures ». Faraday Discuss. 173 (2014) : 173–99. http://dx.doi.org/10.1039/c4fd00073k.

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The geometry and chemistry of graphene nanostructures significantly affects their electronic properties. Despite a large number of experimental and theoretical studies dealing with the geometrical shape-dependent electronic properties of graphene nanostructures, experimental characterisation of their chemistry is clearly lacking. This is mostly due to the difficulties in preparing chemically-modified graphene nanostructures in a controlled manner and in identifying the exact chemistry of the graphene nanostructure on the atomic scale. Herein, we present scanning probe microscopic and first-principles characterisation of graphene nanostructures with different edge geometries and chemistry. Using the results of atomic scale electronic characterisation and theoretical simulation, we discuss the role of the edge geometry and chemistry on the electronic properties of graphene nanostructures with hydrogenated and oxidised linear edges at graphene boundaries and the internal edges of graphene vacancy defects. Atomic-scale details of the chemical composition have a strong impact on the electronic properties of graphene nanostructures,i.e., the presence or absence of non-bonding π states and the degree of resonance stability.
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Loginos, Panagiotis, Anastasios Patsidis et Vasilios Georgakilas. « UV-Cured Poly(Ethylene Glycol) Diacrylate/Carbon Nanostructure Thin Films. Preparation, Characterization, and Electrical Properties ». Journal of Composites Science 4, no 1 (1 janvier 2020) : 4. http://dx.doi.org/10.3390/jcs4010004.

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Carbon nanoallotropes such as carbon nanotubes, graphene, and their derivatives have been combined with a plethora of polymers in the last years to develop new composite materials with interesting properties and applications. However, the area of photopolymer composites with carbon nanostructures has not been analogously explored. In the present article, we study the photopolymerization of poly(ethylene glycol)diacrylate (PEGDA) enriched with different carbon nanoallotropes like graphene, pristine and chemically modified carbon nanotubes (CNTs and fCNTs), and a hybrid of graphene and CNTs. The products were characterized by several microscopic and spectroscopic techniques and the electrical conductivity was studied as a function of the concentrations of carbon nanoallotropes. In general, stable thin films were produced with a concentration of carbon nanostructures up to 8.5%, although the addition of carbon nanostructures in PEGDA decreases the degree of photopolymerization, and PEDGA/carbon nanostructure composites showed electrical conductivity at a relatively low percentage.
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Song, Jun-ho, Ho Kyong Shon, Peng Wang, Am Jang et In S. Kim. « Tuning the nanostructure of nitrogen-doped graphene laminates for forward osmosis desalination ». Nanoscale 11, no 45 (2019) : 22025–32. http://dx.doi.org/10.1039/c9nr06845g.

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Song, Weina, Chunying He, Yongli Dong, Wang Zhang, Yachen Gao, Yiqun Wu et Zhimin Chen. « The effects of central metals on the photophysical and nonlinear optical properties of reduced graphene oxide–metal(ii) phthalocyanine hybrids ». Physical Chemistry Chemical Physics 17, no 11 (2015) : 7149–57. http://dx.doi.org/10.1039/c4cp05963h.

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Wiwatowski, Kamil, Paweł Podlas, Magdalena Twardowska et Sebastian Maćkowski. « Fluorescence Studies of the Interplay between Metal-Enhanced Fluorescence and Graphene-Induced Quenching ». Materials 11, no 10 (9 octobre 2018) : 1916. http://dx.doi.org/10.3390/ma11101916.

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Fluorescence microscopy and spectroscopy were applied for studying the optical properties of a hybrid nanostructure, in which we combine plasmon-induced metal enhanced fluorescence with energy transfer to epitaxial graphene. Covering the layer of silver islands with a monolayer graphene, while turning on the efficient energy transfer from emitters, only moderately affects the enhancement of fluorescence attributed to the plasmon resonance in metallic nanostructures—as evidenced by the analysis of fluorescence decays. The results show that it is feasible to combine the properties of graphene with metal-enhanced fluorescence. The importance of the layer thickness of the emitters is also pointed out.
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Yin, Zheng E., He Zhang, Yan Ru Kang, Jian Min Feng et Ya Li Li. « Fabrication of Graphene/Zirconia Nanocomposite by Mixing Graphite Oxide and Zirconia Nanopowders and Pressureless Sintering ». Key Engineering Materials 512-515 (juin 2012) : 65–68. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.65.

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Graphene has unique two-dimensional nanostructure with high specific surface areas, superior mechanical properties which has promising applications for the development of high performance nanocomposite materials. Most of previous work on graphene nanocomposites addresses on polymer matrix. In the present work, we have fabricated zirconia and graphene nanocomposites (ZrO2/GNS) by simple mechanical mixing and pressureless sintering process. Microstructural observations of the composite show the homogeneous and random distributions of graphene nanosheet in the zirconia matrix. Scanning electronic microscopy observes partially pulled out graphene nanosheets with well combined interface with the matrix in fractural surface, showing promising reinforcement effects.
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Mohammed, Amjed Qasim, Fatima Safaa Fahim, Holya A. Lafta, Rathab Abbass, Athmar Ali Kadhim, Marwah A. Shams et Ayat Hussein Adhab. « Controlling optical lateral shifts in a monolayer graphene system ». Laser Physics Letters 19, no 10 (30 août 2022) : 105205. http://dx.doi.org/10.1088/1612-202x/ac8752.

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Abstract In this letter, we have studied the optical lateral shifts of transmitted and reflected lights in a defect structure doped by a single layer of graphene nanostructure. For adapting the optical features of the lateral shifts, we have first studied the refractive index properties of the defect layer. We have studied the conditions for achieving the negative and positive refractive index of the graphene monolayer system. After that, we have discussed the optical lateral shifts of the reflected and transmitted light beams when the refractive index of the graphene nanostructure become positive or negative, respectively. We have found that the enhanced lateral shifts for reflected and transmitted lights may be possible for a positive refractive index. For the negative refractive index, we have realized that simultaneous negative or positive lateral shifts are possible for the reflected and transmitted light beams. In our proposed scheme, the lateral shifts at the fixed incident angle are possible only by tuning the optical parameters without needing to change the cavity structure.
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Neshani, Sonay, Mohammad Taghi Ahmadi et Meisam Rahmani. « Theoretical analysis on the electronic properties of bubble-wrap carbon nanostructure : fullerene-doped graphene ». Journal of Computational Electronics 21, no 1 (février 2022) : 214–26. http://dx.doi.org/10.1007/s10825-021-01826-0.

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SASAKI, Hiroki, et Kazuhito SHINTANI. « 20113 Analysis of the mechanical properties of a pillared-graphene nanostructure under shear loads ». Proceedings of Conference of Kanto Branch 2013.19 (2013) : 211–12. http://dx.doi.org/10.1299/jsmekanto.2013.19.211.

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Lu, Jian-Duo, Bin Xu, Yun-Bao Li et Jing Li. « Transport properties in a graphene-based magnetic nanostructure modulated by a Schottky metal stripe ». Materials Science in Semiconductor Processing 22 (juin 2014) : 59–63. http://dx.doi.org/10.1016/j.mssp.2014.02.006.

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Salimian, Maryam, Maxim S. Ivanov, Igor Bdikin, Darius Pohl, Steffen Oswald, Vladimir A. Khomchenko, José António Paixão, Bernd Rellinghaus, Paula A. A. P. Marques et Gil Gonçalves. « Nanoengineered nickel/reduced graphene oxide composites : Control of interfacial nanostructure for tunable electrophysical properties ». Applied Surface Science 498 (décembre 2019) : 143781. http://dx.doi.org/10.1016/j.apsusc.2019.143781.

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Bayraktutan, Tuğba. « Investigation of photophysical and binding properties of Rose Bengal dye on graphene oxide and polyethyleneimine-functionalized graphene oxide nanocomposites ». Chemical Papers 74, no 9 (20 mars 2020) : 3017–24. http://dx.doi.org/10.1007/s11696-020-01130-4.

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Valero-Navarro, Angel, Jorge F. Fernandez-Sanchez, Antonio Segura-Carretero, Ursula E. Spichiger-Keller, Alberto Fernandez-Gutierrez, Pascual Oña et Ignacio Fernandez. « Iron-phthalocyanine complexes immobilized in nanostructured metal oxide as optical sensors of NOx and CO : NMR and photophysical studies ». Journal of Porphyrins and Phthalocyanines 13, no 04n05 (avril 2009) : 616–23. http://dx.doi.org/10.1142/s1088424609000796.

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This paper presents the research that is currently undergoing in our group toward the development of optical sensing layers based on iron(II) phthalocyanine complexes immobilized on nanostructured solid supports. Several FePc - N donor ligands have been prepared and coated into different nanostructured metal oxides. Optical properties, chemical variables, analytical features, selectivity rates, response times and type of nanostructure supports have been evaluated; in some cases, interesting correlations between them have been deduced. In addition, thermostability studies have been carried out, providing access to a second generation of nanostructured metal oxides.
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Li, Yue, Mengying Jia, Lanshu Xu, Jianmin Gao, Fan Zhang et Xiao-Juan Jin. « Graphene and activated carbon-wrapped and Co3O4-intercalated 3D sandwich nanostructure hybrid for high-performance supercapacitance ». New Journal of Chemistry 42, no 13 (2018) : 10733–40. http://dx.doi.org/10.1039/c8nj01160e.

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The graphene/Co3O4/activated carbon (GCA) 1 : 9 capacitor shows the best electrochemical properties with Co3O4 particles that were homogeneously dispersed between the graphene/Co3O4 (GC) layers.
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Zhou, Hengjie, Shaojian Su, Weibin Qiu, Zeyang Zhao, Zhili Lin, Pingping Qiu et Qiang Kan. « Multiple Fano Resonances with Tunable Electromagnetic Properties in Graphene Plasmonic Metamolecules ». Nanomaterials 10, no 2 (29 janvier 2020) : 236. http://dx.doi.org/10.3390/nano10020236.

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Multiple Fano resonances (FRs) can be produced by destroying the symmetry of structure or adding additional nanoparticles without changing the spatial symmetry, which has been proved in noble metal structures. However, due to the disadvantages of low modulation depth, large damping rate, and broadband spectral responses, many resonance applications are limited. In this research paper, we propose a graphene plasmonic metamolecule (PMM) by adding an additional 12 nanodiscs around a graphene heptamer, where two Fano resonance modes with different wavelengths are observed in the extinction spectrum. The competition between the two FRs as well as the modulation depth of each FR is investigated by varying the materials and the geometrical parameters of the nanostructure. A simple trimer model, which emulates the radical distribution of the PMM, is employed to understand the electromagnetic field behaviors during the variation of the parameters. Our proposed graphene nanostructures might find significant applications in the fields of single molecule detection, chemical or biochemical sensing, and nanoantenna.
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Zhang, Meng Meng, Hong Xia Yan, Chao Gong et Yi Chen Feng. « Hyperbranched Polysiloxane Functionalized Graphene Oxide via Polyhydrosilylation ». Applied Mechanics and Materials 464 (novembre 2013) : 3–8. http://dx.doi.org/10.4028/www.scientific.net/amm.464.3.

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A novel method to functionalize graphene oxide (GO) by hyperbranched polysiloxane via polyhydrosilylation is reported, taking advantage of hyperbranched polysiloxane that possesses good properties such as low viscosity, good rheology, good solubility and high reactivity. The changes in GO surface morphology, chemistry and physical conditions at different stages are characterized by Fourier-transform infrared spectra (FT-IR), X-ray photoelectron spectroscopy (XPS) and Transmission electron microscopy (TEM). XPS analysis shows that the oxygen content of GO is 29.90% and the silicon content of hyperbranched polysiloxane grafted graphene oxide (HBPGO) is 18.66%. The results indicate that hyperbranched polysiloxane is successfully grafted onto the surface of GO and this novel nanostructure may have potential applications in composites.
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Iqbal, M. S., M. Iqbal, M. Haseeb, M. Aftab, A. Amin et H. Anwar. « Investigation of the effect of annealing temperature on photophysical properties of manganese dioxide nanostructure prepared via co-precipitation route ». IOP Conference Series : Materials Science and Engineering 863 (13 juin 2020) : 012033. http://dx.doi.org/10.1088/1757-899x/863/1/012033.

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Yan, Siqi, Jeremy Adcock et Yunhong Ding. « Graphene on Silicon Photonics : Light Modulation and Detection for Cutting-Edge Communication Technologies ». Applied Sciences 12, no 1 (29 décembre 2021) : 313. http://dx.doi.org/10.3390/app12010313.

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Graphene—a two-dimensional allotrope of carbon in a single-layer honeycomb lattice nanostructure—has several distinctive optoelectronic properties that are highly desirable in advanced optical communication systems. Meanwhile, silicon photonics is a promising solution for the next-generation integrated photonics, owing to its low cost, low propagation loss and compatibility with CMOS fabrication processes. Unfortunately, silicon’s photodetection responsivity and operation bandwidth are intrinsically limited by its material characteristics. Graphene, with its extraordinary optoelectronic properties has been widely applied in silicon photonics to break this performance bottleneck, with significant progress reported. In this review, we focus on the application of graphene in high-performance silicon photonic devices, including modulators and photodetectors. Moreover, we explore the trend of development and discuss the future challenges of silicon-graphene hybrid photonic devices.
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Umeyama, Tomokazu, Junya Mihara, Noriyasu Tezuka, Yoshihiro Matano, Kati Stranius, Vladimir Chukharev, Nikolai V. Tkachenko et al. « Preparation and Photophysical and Photoelectrochemical Properties of a Covalently Fixed Porphyrin-Chemically Converted Graphene Composite ». Chemistry - A European Journal 18, no 14 (28 février 2012) : 4250–57. http://dx.doi.org/10.1002/chem.201103843.

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Stergiou, Anastasios, Ioanna K. Sideri, Martha Kafetzi, Anna Ioannou, Raul Arenal, Georgios Mousdis, Stergios Pispas et Nikos Tagmatarchis. « Methylammonium Lead Bromide Perovskite Nano-Crystals Grown in a Poly[styrene-co-(2-(dimethylamino)ethyl Methacrylate)] Matrix Immobilized on Exfoliated Graphene Nano-Sheets ». Nanomaterials 12, no 8 (8 avril 2022) : 1275. http://dx.doi.org/10.3390/nano12081275.

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Development of graphene/perovskite heterostructures mediated by polymeric materials may constitute a robust strategy to resolve the environmental instability of metal halide perovskites and provide barrierless charge transport. Herein, a straightforward approach for the growth of perovskite nano-crystals and their electronic communication with graphene is presented. Methylammonium lead bromide (CH3NH3PbBr3) nano-crystals were grown in a poly[styrene-co-(2-(dimethylamino)ethyl methacrylate)], P[St-co-DMAEMA], bi-functional random co-polymer matrix and non-covalently immobilized on graphene. P[St-co-DMAEMA] was selected as a bi-modal polymer capable to stabilize the perovskite nano-crystals via electrostatic interactions between the tri-alkylamine amine sites of the co-polymer and the A-site vacancies of the perovskite and simultaneously enable Van der Waals attractive interactions between the aromatic arene sites of the co-polymer and the surface of graphene. The newly synthesized CH3NH3PbBr3/co-polymer and graphene/CH3NH3PbBr3/co-polymer ensembles were formed by physical mixing of the components in organic media at room temperature. Complementary characterization by dynamic light scattering, microscopy, and energy-dispersive X-ray spectroscopy revealed the formation of uniform spherical perovskite nano-crystals immobilized on the graphene nano-sheets. Complementary photophysical characterization by UV-Vis absorption, steady-state, and time-resolved fluorescence spectroscopy unveiled the photophysical properties of the CH3NH3PbBr3/co-polymer colloid perovskite solution and verified the electronic communication within the graphene/CH3NH3PbBr3/co-polymer ensembles at the ground and excited states.
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Tilwani, Aneshkumar, Hildegarde Bell, Jose Alvarez, Belqais Naqshbandi et Folarin Erogbogbo. « Graphene Quantum dots for Biophotonic Applications ». MRS Proceedings 1786 (2015) : 1–6. http://dx.doi.org/10.1557/opl.2015.764.

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ABSTRACTGraphene Quantum Dots (GQDs) are of interest to the biomedical community due to their unique fluorescence properties, which may be advantageous for biology and medicine. Advantages of this graphene nanomaterial over fluorescent dyes for biomedical imaging include bright emission, easy surface modification, biocompatibility, and anticipated low toxicity. We hypothesize that GQDs with desirable fluorescence properties which can be used for effective biomedical imaging (such as near infrared emission) may be synthesized from cheap carbon sources. Here, we show that these fluorescent GQDs are fabricated in a facile wet chemistry route using activated charcoal as the starting material. The GQDs were characterized with AFM, TEM, FTIR, PL spectroscopy, Raman spectroscopy and animal imaging techniques. The particles were visible in animals indicating their potential for biomedical imaging. The GQDs exhibited excitation that spanned the UV and visible ranges and emission that spanned the visible and near infrared ranges. The GQDs were an average of 4 nm in height, crystalline, from 1 to 60 nm in size. The GQDs were consistent with the presence of graphene and the following functional groups: C-O, C-H, C=C, and CO2H. In conclusion, GQDs with favorable photophysical properties can be produced from affordable and widely available raw materials for imaging and other biomedical application purposes.
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Bi, Kaixi, Jiliang Mu, Wenping Geng, Linyu Mei, Siyuan Zhou, Yaokai Niu, Wenxiao Fu, Ligang Tan, Shuqi Han et Xiujian Chou. « Reliable Fabrication of Graphene Nanostructure Based on e-Beam Irradiation of PMMA/Copper Composite Structure ». Materials 14, no 16 (17 août 2021) : 4634. http://dx.doi.org/10.3390/ma14164634.

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Graphene nanostructures are widely perceived as a promising material for fundamental components; their high-performance electronic properties offer the potential for the construction of graphene nanoelectronics. Numerous researchers have paid attention to the fabrication of graphene nanostructures, based on both top-down and bottom-up approaches. However, there are still some unavoidable challenges, such as smooth edges, uniform films without folds, and accurate dimension and location control. In this work, a direct writing method was reported for the in-situ preparation of a high-resolution graphene nanostructure of controllable size (the minimum feature size is about 15 nm), which combines the advantages of e-beam lithography and copper-catalyzed growth. By using the Fourier infrared absorption test, we found that the hydrogen and oxygen elements were disappearing due to knock-on displacement and the radiolysis effect. The graphene crystal is also formed via diffusion and the local heating effect between the e-beam and copper substrate, based on the Raman spectra test. This simple process for the in-situ synthesis of graphene nanostructures has many promising potential applications, including offering a way to make nanoelectrodes, NEMS cantilever resonant structures, nanophotonic devices and so on.
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Bezzon, Vinícius D. N., Thaís L. A. Montanheiro, Beatriz R. C. de Menezes, Renata G. Ribas, Victor A. N. Righetti, Karla F. Rodrigues et Gilmar P. Thim. « Carbon Nanostructure-based Sensors : A Brief Review on Recent Advances ». Advances in Materials Science and Engineering 2019 (3 mars 2019) : 1–21. http://dx.doi.org/10.1155/2019/4293073.

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A brief review reporting the recent advances on the carbon nanostructured materials-based sensors covering recently published works is presented. Several works dealing with experimental and theoretical data are reviewed and discussed. The main results for carbon nanotubes, nanodiamonds, fullerene, graphene, and hybrid carbon-nanostructured devices that show sensing properties in different fields were considered for the discussions. The goal of this paper was to highlight sensor mechanisms, and the best results reached up to now are creating bases for further applications.
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Kausar, Ayesha, Ishaq Ahmad, M. H. Eisa et Malik Maaza. « Graphene Nanocomposites in Space Sector—Fundamentals and Advancements ». C 9, no 1 (3 mars 2023) : 29. http://dx.doi.org/10.3390/c9010029.

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Graphene is one of the most significant carbon nanomaterials, with a one-atom-thick two-dimensional nanostructure. Like other nanocarbons, graphene has been used as a polymer reinforcement. This review explores the impact of graphene and graphene-based nanocomposites on aerospace applications. The fabrication and indispensable features of graphene-derived nanocomposites have been considered. Numerous polymers and nanocomposites have been employed for aerospace systems such as reinforced thermosetting/thermoplastic polymers and epoxy/graphene nanocomposites. Moreover, graphene-modified carbon-fiber-based composites have been discussed for the space sector. Aerospace nanocomposites with graphene have been investigated for superior processability, structural features, morphology, heat stability, mechanical properties, flame resistance, electrical/thermal conductivity, radiation protection, and adhesion applications. Subsequently, epoxy and graphene-derived nanocomposites have been explored for heat/mechanically stable aerospace engineering structures, radiation-shielding materials, adhesives, coatings, etc.
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