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Articles de revues sur le sujet « Materials Chemistry - Graphene Nanostructure »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Barra, Ana, Cláudia Nunes, Eduardo Ruiz-Hitzky et Paula Ferreira. « Green Carbon Nanostructures for Functional Composite Materials ». International Journal of Molecular Sciences 23, no 3 (6 février 2022) : 1848. http://dx.doi.org/10.3390/ijms23031848.

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Carbon nanostructures are widely used as fillers to tailor the mechanical, thermal, barrier, and electrical properties of polymeric matrices employed for a wide range of applications. Reduced graphene oxide (rGO), a carbon nanostructure from the graphene derivatives family, has been incorporated in composite materials due to its remarkable electrical conductivity, mechanical strength capacity, and low cost. Graphene oxide (GO) is typically synthesized by the improved Hummers’ method and then chemically reduced to obtain rGO. However, the chemical reduction commonly uses toxic reducing agents, such as hydrazine, being environmentally unfriendly and limiting the final application of composites. Therefore, green chemical reducing agents and synthesis methods of carbon nanostructures should be employed. This paper reviews the state of the art regarding the green chemical reduction of graphene oxide reported in the last 3 years. Moreover, alternative graphitic nanostructures, such as carbons derived from biomass and carbon nanostructures supported on clays, are pointed as eco-friendly and sustainable carbonaceous additives to engineering polymer properties in composites. Finally, the application of these carbon nanostructures in polymer composites is briefly overviewed.
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Wallace, Steaphan M., Thiyagu Subramani, Wipakorn Jevasuwan et Naoki Fukata. « Conversion of Amorphous Carbon on Silicon Nanostructures into Similar Shaped Semi-Crystalline Graphene Sheets ». Journal of Nanoscience and Nanotechnology 21, no 9 (1 septembre 2021) : 4949–54. http://dx.doi.org/10.1166/jnn.2021.19329.

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Graphene sheets displaying partial crystallinity and nanowire structures were formed on a silicon substrate with silicon nanowires by utilizing an amorphous carbon source. The carbon source was deposited onto the silicon nanostructured substrate by breaking down a polymer precursor and was crystallized by a nickel catalyst during relatively low temperature inert gas annealing. The resulting free-standing graphene-based material can remain on the substrate surface after catalyst removal or can be removed as a separate film. The film is flexible, continuous, and closely mimics the silicon nanostructure. This follows research on similar solid carbon precursor derived semi-crystalline graphene synthesis procedures and applies it to complex silicon nanostructures. This work examined the progression of the carbon, finding that it migrates through the thin film catalyst and forms the graphene only on the other side, and that the process can successfully be used to form 3D shaped graphene films. Semi-crystalline graphene has the possible application of being flexible transparent electrodes, and the 3D shaping opens the possibility of more complex configurations and applications.
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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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Xu, Yangyang, Jinyang Liu, Chuandong Zuo, Hongbing Cai, Ping Wu, Zhigao Huang, Fachun Lai, Limei Lin, Weifeng Zheng et Yan Qu. « The Role of Hydrogen on the Growth of Graphene Nanostructure Using a Two-Step Method ». Journal of Nanoscience and Nanotechnology 19, no 11 (1 novembre 2019) : 7294–300. http://dx.doi.org/10.1166/jnn.2019.16652.

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Chemical vapor deposition (CVD) is widely applied in synthesizing high quality graphene, whose size, shape and structure are strongly impacted by the hydrogen concentration and, however, its role is not fully understood. In the traditional CVD, the concentration of the hydrogen keeps the constant in whole synthesis process and subsequently the nucleation and growth process are carried out simultaneously, therefore, its roles are usually confused and indistinguishable. In this report, the role of hydrogen on the growth of graphene nanostructure was creatively studied by introducing a two-step method which divided the nucleation and growth process for the first time. In the first step, the hexagonal graphene domain grown with the same conditions was used as precursor to eliminate the impact of the nucleation. In the second step, the role of hydrogen on the growth of graphene nanostructure was investigated by controlling the hydrogen concentration. The evolution behavior of the graphene nanostructure with the hydrogen concentration was systematically investigated. Two roles of the hydrogen, namely growth and etching modes, are clearly disclosed and then a possible mechanism was proposed. The results shown here may provide valuable guidance to understand the graphene growth mechanism and further advance the synthesis of unique graphene nanostructure.
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Huang, Yue, Jiayi Lin, Liyue Liu, Qing Lu, Xiaoling Zhang, Ganghua Zhang et Dezeng Li. « Enhanced performance of graphene transparent conductive films by introducing SiO2 bilayer antireflection nanostructure ». New Journal of Chemistry 43, no 48 (2019) : 19063–68. http://dx.doi.org/10.1039/c9nj03671g.

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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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Liu, Yansheng, Zhenle Qin, Junpeng Deng, Jin Zhou, Xiaobo Jia, Guofu Wang et Feng Luo. « The Advanced Applications of 2D Materials in SERS ». Chemosensors 10, no 11 (2 novembre 2022) : 455. http://dx.doi.org/10.3390/chemosensors10110455.

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Surface-enhanced Raman scattering (SERS) as a label-free, non-contact, highly sensitive, and powerful technique has been widely applied in determining bio- and chemical molecules with fingerprint recognitions. 2-dimensional (2D) materials with layered structures, tunable optical properties, good chemical/physical stabilities, and strong charge–transfer interaction with molecules have attracted researchers’ interests. Two-D materials with a large and flat surface area, as well as good biocompatibility have been considered promising candidates in SERS and widely applied in chemical and bio-applications. It is well known that the noble metallic nanostructures with localized surface plasmon effects dominate the SERS performance. The combination of noble metallic nanostructure with 2D materials is becoming a new and attractive research domain. Until now, the SERS substrates combined with 2D materials, such as 2D graphene/metallic NPs, 2D materials@metallic core-shell structures, and metallic structure/2D materials/metallic structure are intensely studied. In this review, we introduce different kinds of fabrication strategies of 2D and 3D SERS substrates combing with 2D materials as well as their applications. We hope this review will help readers to figure out new ideas in designing and fabricating SERS substrates with high SERS performance that could enlarge the applicable domains of SERS.
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Shang, Lina, Faming Kang, Wenze Gao, Zheng Zhou et Wei Xu. « On-Surface Synthesis of sp-Carbon Nanostructures ». Nanomaterials 12, no 1 (31 décembre 2021) : 137. http://dx.doi.org/10.3390/nano12010137.

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The on-surface synthesis of carbon nanostructures has attracted tremendous attention owing to their unique properties and numerous applications in various fields. With the extensive development of scanning tunneling microscope (STM) and noncontact atomic force microscope (nc-AFM), the on-surface fabricated nanostructures so far can be characterized on atomic and even single-bond level. Therefore, various novel low-dimensional carbon nanostructures, challenging to traditional solution chemistry, have been widely studied on surfaces, such as polycyclic aromatic hydrocarbons, graphene nanoribbons, nanoporous graphene, and graphyne/graphdiyne-like nanostructures. In particular, nanostructures containing sp-hybridized carbons are of great advantage for their structural linearity and small steric demands as well as intriguing electronic and mechanical properties. Herein, the recent developments of low-dimensional sp-carbon nanostructures fabricated on surfaces will be summarized and discussed.
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Catania, Federica, Elena Marras, Mauro Giorcelli, Pravin Jagdale, Luca Lavagna, Alberto Tagliaferro et Mattia Bartoli. « A Review on Recent Advancements of Graphene and Graphene-Related Materials in Biological Applications ». Applied Sciences 11, no 2 (10 janvier 2021) : 614. http://dx.doi.org/10.3390/app11020614.

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Graphene is the most outstanding material among the new nanostructured carbonaceous species discovered and produced. Graphene’s astonishing properties (i.e., electronic conductivity, mechanical robustness, large surface area) have led to a deep change in the material science field. In this review, after a brief overview of the main characteristics of graphene and related materials, we present an extensive overview of the most recent achievements in biological uses of graphene and related materials.
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Žurauskienė, Nerija. « Engineering of Advanced Materials for High Magnetic Field Sensing : A Review ». Sensors 23, no 6 (8 mars 2023) : 2939. http://dx.doi.org/10.3390/s23062939.

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Advanced scientific and industrial equipment requires magnetic field sensors with decreased dimensions while keeping high sensitivity in a wide range of magnetic fields and temperatures. However, there is a lack of commercial sensors for measurements of high magnetic fields, from ∼1 T up to megagauss. Therefore, the search for advanced materials and the engineering of nanostructures exhibiting extraordinary properties or new phenomena for high magnetic field sensing applications is of great importance. The main focus of this review is the investigation of thin films, nanostructures and two-dimensional (2D) materials exhibiting non-saturating magnetoresistance up to high magnetic fields. Results of the review showed how tuning of the nanostructure and chemical composition of thin polycrystalline ferromagnetic oxide films (manganites) can result in a remarkable colossal magnetoresistance up to megagauss. Moreover, by introducing some structural disorder in different classes of materials, such as non-stoichiometric silver chalcogenides, narrow band gap semiconductors, and 2D materials such as graphene and transition metal dichalcogenides, the possibility to increase the linear magnetoresistive response range up to very strong magnetic fields (50 T and more) and over a large range of temperatures was demonstrated. Approaches for the tailoring of the magnetoresistive properties of these materials and nanostructures for high magnetic field sensor applications were discussed and future perspectives were outlined.
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Zhou, Zhe, Fei Xiu, Tongfen Jiang, Jingxuan Xu, Jie Chen, Juqing Liu et Wei Huang. « Solution-processable zinc oxide nanorods and a reduced graphene oxide hybrid nanostructure for highly flexible and stable memristor ». Journal of Materials Chemistry C 7, no 35 (2019) : 10764–68. http://dx.doi.org/10.1039/c9tc03840j.

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12

Yan, Xin, et Liang-shi Li. « Solution-chemistry approach to graphene nanostructures ». Journal of Materials Chemistry 21, no 10 (2011) : 3295. http://dx.doi.org/10.1039/c0jm02827d.

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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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14

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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Lau, Kam Sheng, Sin Tee Tan, Riski Titian Ginting, Poi Sim Khiew, Siew Xian Chin et Chin Hua Chia. « A mechanistic study of silver nanostructure incorporating reduced graphene oxide via a flow synthesis approach ». New Journal of Chemistry 44, no 4 (2020) : 1439–45. http://dx.doi.org/10.1039/c9nj04881b.

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Tabassum, Sadia, Saira Naz, Amjad Nisar, Hongyu Sun, Shafqat Karim, Maaz Khan, Shiasta Shahzada, Ata ur Rahman et Mashkoor Ahmad. « Synergic effect of plasmonic gold nanoparticles and graphene oxide on the performance of glucose sensing ». New Journal of Chemistry 43, no 47 (2019) : 18925–34. http://dx.doi.org/10.1039/c9nj04532e.

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A highly sensitive Au–GO hybrid nanostructure based non-enzymatic glucose biosensor is fabricated and exhibits superior sensitivity of 84.53 μA mM−1 cm−2. The biosensor also has applications for the detection of glucose in human blood serum, food samples and drinks.
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Wei, Xianqi, Zelin Li, Junchen Lu, Shunlong Xu, Yuancheng Zhu, Linxing Shi, Zengguang Huang, Guoqing Lu et Xiaoli Wang. « Thermal Conductivity of Graphene on Nanostructure Size from Nonequilibrium Molecular Dynamics Simulations ». Journal of Computational and Theoretical Nanoscience 17, no 4 (1 avril 2020) : 1566–70. http://dx.doi.org/10.1166/jctn.2020.8938.

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Thermal transport of graphene occupies a unique place in thermal management of electronic devices, especially for nanosize devices with high-density integration and high dissipated power. The structure of graphene on nanometer scale changes its thermal conductance. Here, the thermal characters of graphene have been researched by nonequilibrium molecular dynamics simulation (NEMDS) at room temperature. Special attention is focused on the edge type (zigzag or armchair) and nanostructure size dependence of conductivity for heat. The consequences suggest that the thermal conductivity of zigzag edge has been higher than that of armchair, which is because of the higher phonon group velocities. Furthermore, thermal conductivity shows a rising tendency, when the model is calculated from length of 21.84 nm to 43.78 nm. The result indicates that the thermal property performs a strong dependence on nanostructure size which is less than phonon mean free path (775 nm). Our research highlights the significance of structure attribute relationships together with providing useful guideline in calculations for nanosize devices thermal management.
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Kudr, Jiri, Vojtech Adam et Ondrej Zitka. « Fabrication of Graphene/Molybdenum Disulfide Composites and Their Usage as Actuators for Electrochemical Sensors and Biosensors ». Molecules 24, no 18 (17 septembre 2019) : 3374. http://dx.doi.org/10.3390/molecules24183374.

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From the rediscovery of graphene in 2004, the interest in layered graphene analogs has been exponentially growing through various fields of science. Due to their unique properties, novel two-dimensional family of materials and especially transition metal dichalcogenides are promising for development of advanced materials of unprecedented functions. Progress in 2D materials synthesis paved the way for the studies on their hybridization with other materials to create functional composites, whose electronic, physical or chemical properties can be engineered for special applications. In this review we focused on recent progress in graphene-based and MoS2 hybrid nanostructures. We summarized and discussed various fabrication approaches and mentioned different 2D and 3D structures of composite materials with emphasis on their advances for electroanalytical chemistry. The major part of this review provides a comprehensive overview of the application of graphene-based materials and MoS2 composites in the fields of electrochemical sensors and biosensors.
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Turchinovich, Dmitry, Zoltan Mics, Søren A. Jensen, Klaas-Jan Tielrooij, Ivan Ivanov, Khaled Parvez, Akimitsu Narita et al. « Ultrafast carrier dynamics in graphene and graphene nanostructures ». Terahertz Science and Technology 13, no 4 (décembre 2020) : 135–48. http://dx.doi.org/10.1051/tst/2020134135.

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In this paper we provide a comprehensive view on the ultrafast conduction dynamics in graphene and graphene nanostructures. We show that ultrafast conduction in graphene can be well understood within a simple thermodynamic picture, by taking into account the dynamical interplay between electron heating and cooling, with the driving electric field acting as a supplier of thermal energy to graphene electron population. At the same time, the conductive properties of graphene nanostructures, such as graphene nanoribbons (GNRs) and carbon nanotubes (CNTs), can be well explained within the concept typical for disordered materials, such as e.g. organic semiconductors - the conduction by the free charge experiencing long-range localization.
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Metaxa, Zoi S., Athanasia K. Tolkou, Stefania Efstathiou, Abbas Rahdar, Evangelos P. Favvas, Athanasios C. Mitropoulos et George Z. Kyzas. « Nanomaterials in Cementitious Composites : An Update ». Molecules 26, no 5 (6 mars 2021) : 1430. http://dx.doi.org/10.3390/molecules26051430.

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This review is an update about the addition of nanomaterials in cementitious composites in order to improve their performance. The most common used nanomaterials for cementitious materials are carbon nanotubes, nanocellulose, nanographene, graphene oxide, nanosilica and nanoTiO2. All these nanomaterials can improve the physical, mechanical, thermal and electrical properties of cementitious composites, for example increase their compressive and tensile strength, accelerate hydration, decrease porosity and enhance fire resistance. Cement based materials have a very complex nanostructure consisting of hydration products, crystals, unhydrated cement particles and nanoporosity where traditional reinforcement, which is at the macro and micro scale, is not effective. Nanomaterials can reinforce the nanoscale, which wasn’t possible heretofore, enhancing the performance of the cementitious matrix.
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Kumar, Sanjay, Suneel Kumar, Manisha Sengar et Pratibha Kumari. « Gold-carbonaceous materials based heterostructures for gas sensing applications ». RSC Advances 11, no 23 (2021) : 13674–99. http://dx.doi.org/10.1039/d1ra00361e.

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Kononov, Alina, Alexandra Olmstead, Andrew D. Baczewski et André Schleife. « First-principles simulation of light-ion microscopy of graphene ». 2D Materials 9, no 4 (15 septembre 2022) : 045023. http://dx.doi.org/10.1088/2053-1583/ac8e7e.

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Abstract The extreme sensitivity of 2D materials to defects and nanostructure requires precise imaging techniques to verify presence of desirable and absence of undesirable features in the atomic geometry. Helium-ion beams have emerged as a promising materials imaging tool, achieving up to 20 times higher resolution and 10 times larger depth-of-field than conventional or environmental scanning electron microscopes. Here, we offer first-principles theoretical insights to advance ion-beam imaging of atomically thin materials by performing real-time time-dependent density functional theory simulations of single impacts of 10–200 keV light ions in free-standing graphene. We predict that detecting electrons emitted from the back of the material (the side from which the ion exits) would result in up to three times higher signal and up to five times higher contrast images, making 2D materials especially compelling targets for ion-beam microscopy. This predicted superiority of exit-side emission likely arises from anisotropic kinetic emission. The charge induced in the graphene equilibrates on a sub-fs time scale, leading to only slight disturbances in the carbon lattice that are unlikely to damage the atomic structure for any of the beam parameters investigated here.
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Ma, Hongyu, Xiaofang Chen, Shabin Mohammed, Yaoxin Hu, Jun Lu, George P. Simon, Hongjuan Hou et Huanting Wang. « A thermally reduced graphene oxide membrane interlayered with an in situ synthesized nanospacer for water desalination ». Journal of Materials Chemistry A 8, no 48 (2020) : 25951–58. http://dx.doi.org/10.1039/d0ta05790h.

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Gulab, Hussain, Nusrat Fatima, Nadia Shahzad, Muhammad Imran Shahzad, Mohsin Siddique, Muhammad Hussain et Muhammad Humayun. « Fabrication of Carbon/Zinc Oxide Nanocomposites as Highly Efficient Catalytic Materials for Application in Dye-Sensitized Solar Cells ». Catalysts 12, no 11 (3 novembre 2022) : 1354. http://dx.doi.org/10.3390/catal12111354.

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Different nanostructured semiconducting ZnO photoanodes were prepared by Hydrothermal (HT), Co-precipitation (CoP) and Chemical Bath Deposition (CBD) methods for their use in the Dye Sensitized Solar Cells (DSSCs) in the present study. Additionally, different ZnO nanocomposites were synthesized by mixing the Carbon Nanotubes (CNTs), Graphene Oxide (GO) and their combination with the ZnO nanostructures. Scanning electron microscopy (SEM) revealed various morphologies of ZnO nanostructures and nanocomposites such as nanoflowers, nanorods, rhombohedral, cubic, and cauliflower-like nanorods, and nanorods with hexagonal symmetry. Energy Dispersive X-ray (EDX) spectra confirmed the purity of the synthesized samples. X-ray Diffraction (XRD) demonstrated the hexagonal wurtzite phase of ZnO and a minor presence of CNTs and graphene. The UV-Visible, transmittance and diffuse reflectance spectra demonstrated that the ZnO synthesized through the CBD method exhibits the highest transmittance as 70–71% in the UV-Vis range and reduced % R. Optical band gaps of the samples were determined with the help of Tauc plots. Comparison of J-V characteristics showed that the ZnO synthesized via the HT method exhibits the highest conversion efficiency of 1.45%. Comparison among pristine ZnO synthesized via CBD and ZnO nanocomposites revealed that ZnO/CNTs possesses the highest energy conversion efficiency of 1.23% with enhanced JSC of 4.49 mA/cm2.
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Yang, Chuanning, Wangchuan Xiao, Shizhao Ren et Qiyong Li. « Flexible Free-Standing Graphene-Fe2O3 Hybrid Paper with Enhanced Electrochemical Performance for Rechargeable Lithium-Ion Batteries ». Coatings 12, no 11 (11 novembre 2022) : 1726. http://dx.doi.org/10.3390/coatings12111726.

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The cyclic performance of flexible free-standing graphene-Fe2O3 hybrid sheet is considerably improved and was fabricated by a novel one-step hydrothermal process. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical workstation are performed to characterize the microstructure and electrochemical performance of the graphene-Fe2O3 hybrid sheet. At a current density of 200 mA·g−1, the obtained product has a high initial discharge capacity of 1466 mAh·g−1. The nanohybrids also exhibited a considerably high reversible capacity of 765 mAh·g−1 and high Coulombic efficiency of 99.8% after 100 cycles, which benefited from the open 3D laminated nanostructure constructed by layered graphene paper and Fe2O3 nanoparticles. Therefore, the composite has excellent rate performance and stability and can be greatly extended as the anode material of lithium-ion batteries.
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Guo, Meng, Yanmei Yang, Yanhua Leng, Li Wang, Huomin Dong, Hong Liu et Weifeng Li. « Edge dominated electronic properties of MoS2/graphene hybrid 2D materials : edge state, electron coupling and work function ». Journal of Materials Chemistry C 5, no 20 (2017) : 4845–51. http://dx.doi.org/10.1039/c7tc00816c.

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Wilson, Peter M., Gilbert N. Mbah, Thomas G. Smith, Daniel Schmidt, Rebecca Y. Lai, Tino Hofmann et Alexander Sinitskii. « Three-dimensional periodic graphene nanostructures ». Journal of Materials Chemistry C 2, no 10 (2014) : 1879. http://dx.doi.org/10.1039/c3tc32277g.

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Guseva, Evgenia N., et Vjacheslav V. Zuev. « Kinetics formation of nanostructure of polyurethanes in the presence of graphene ». Fullerenes, Nanotubes and Carbon Nanostructures 24, no 7 (11 mai 2016) : 474–78. http://dx.doi.org/10.1080/1536383x.2016.1183120.

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Peng, Yuanyou, Meimei Yu, Lei Zhao, Xiwei Ji, Tianqi He, Ying Liu, Qi Wang et Fen Ran. « 3D layered nanostructure of vanadium nitrides quantum Dots@Graphene anode materials via In-Situ redox reaction strategy ». Chemical Engineering Journal 417 (août 2021) : 129267. http://dx.doi.org/10.1016/j.cej.2021.129267.

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Golzar, Hossein, Fatemeh Yazdian, Mohadeseh Hashemi, Meisam Omidi, Dorsa Mohammadrezaei, Hamid Rashedi, Masoumeh Farahani, Nazanin Ghasemi, Javad Shabani shayeh et Lobat Tayebi. « Optimizing the hybrid nanostructure of functionalized reduced graphene oxide/silver for highly efficient cancer nanotherapy ». New Journal of Chemistry 42, no 15 (2018) : 13157–68. http://dx.doi.org/10.1039/c8nj01764f.

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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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Troncoso, Omar P., et Fernando G. Torres. « Bacterial Cellulose—Graphene Based Nanocomposites ». International Journal of Molecular Sciences 21, no 18 (7 septembre 2020) : 6532. http://dx.doi.org/10.3390/ijms21186532.

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Bacterial cellulose (BC) and graphene are materials that have attracted the attention of researchers due to their outstanding properties. BC is a nanostructured 3D network of pure and highly crystalline cellulose nanofibres that can act as a host matrix for the incorporation of other nano-sized materials. Graphene features high mechanical properties, thermal and electric conductivity and specific surface area. In this paper we review the most recent studies regarding the development of novel BC-graphene nanocomposites that take advantage of the exceptional properties of BC and graphene. The most important applications of these novel BC-graphene nanocomposites include the development of novel electric conductive materials and energy storage devices, the preparation of aerogels and membranes with very high specific area as sorbent materials for the removal of oil and metal ions from water and a variety of biomedical applications, such as tissue engineering and drug delivery. The main properties of these BC-graphene nanocomposites associated with these applications, such as electric conductivity, biocompatibility and specific surface area, are systematically presented together with the processing routes used to fabricate such nanocomposites.
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Zhang, Rui, Tongqing Zhang, Youfeng Cai, Xuyang Zhu, Qiong Han, Yu Li et Yi Liu. « Reduced Graphene Oxide-Doped Ag3PO4 Nanostructure as a High Efficiency Photocatalyst Under Visible Light ». Journal of Inorganic and Organometallic Polymers and Materials 30, no 2 (4 juin 2019) : 543–53. http://dx.doi.org/10.1007/s10904-019-01214-z.

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Muchtar, Ahmad Rifqi, Ni Luh Wulan Septiani, Muhammad Iqbal, Ahmad Nuruddin et Brian Yuliarto. « Preparation of Graphene–Zinc Oxide Nanostructure Composite for Carbon Monoxide Gas Sensing ». Journal of Electronic Materials 47, no 7 (21 mars 2018) : 3647–56. http://dx.doi.org/10.1007/s11664-018-6213-x.

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Mutuma, Bridget K., Boitumelo Matsoso, Kamalakannan Ranganathan, Daniel Wamwangi et Neil J. Coville. « Generation of open-ended, worm-like and graphene-like structures from layered spherical carbon materials ». RSC Advances 6, no 24 (2016) : 20399–408. http://dx.doi.org/10.1039/c5ra25880d.

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Shahmoradi, Saleheh, Hossein Golzar, Mohadeseh Hashemi, Vahid Mansouri, Meisam Omidi, Fatemeh Yazdian, Amir Yadegari et Lobat Tayebi. « Optimizing the nanostructure of graphene oxide/silver/arginine for effective wound healing ». Nanotechnology 29, no 47 (27 septembre 2018) : 475101. http://dx.doi.org/10.1088/1361-6528/aadedc.

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Balandin, Alexander A. « Thermal properties of graphene and nanostructured carbon materials ». Nature Materials 10, no 8 (22 juillet 2011) : 569–81. http://dx.doi.org/10.1038/nmat3064.

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Park, Ho Seok, Bong Gill Choi, Won Hi Hong et Sung-Yeon Jang. « Controlled assembly of graphene oxide nanosheets within one-dimensional polymer nanostructure ». Journal of Colloid and Interface Science 406 (septembre 2013) : 24–29. http://dx.doi.org/10.1016/j.jcis.2013.03.072.

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Thirumal, Vediyappan, Palanisamy Rajkumar, Kisoo Yoo et Jinho Kim. « Hydrothermal Synthesis of Boron-Doped Graphene for High-Performance Zinc-Ion Hybrid Capacitor Using Aloe Vera Gel Electrolyte ». Inorganics 11, no 7 (29 juin 2023) : 280. http://dx.doi.org/10.3390/inorganics11070280.

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The great interest in developing emerging zinc-ion capacitors (ZIC) for energy storage applications is due to their inexpensiveness and the future necessity for hybrid electrical energy storage devices. The Zn-ion hybrid capacitor device was assembled using boron (B)-doped reduced graphene oxide (B-RGO) material, which acts as the cathode, and pure zinc metal as an anode. This research work aims to study the influence of B-doped reduced graphene oxide (B-RGO) with Aloe vera gel as an electrolyte. The reduced graphene oxide (RGO) and B-RGO electrode active materials were confirmed through X-ray diffraction (XRD), RAMAN, Fourier transformation infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM) and field emission-transmission electron microscopy (FE-TEM) analysis. The surface morphological images reveal that a few-layered nanostructure B-RGO was used in the Zn-ion hybrid capacitor device. The electrochemical performance of the Zn-ion hybrid capacitor was evaluated through cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) measurements, with a wide active potential range of 0–2 V versus Zn/Zn+. The mixture composition of Aloe vera extract and 1M ZnSO4 electrolyte generated a stable voltage and exhibited good capacitive behavior. The fabricated ZIC coin cell device with the Aloe vera gel semi-gel electrolyte containing ZnSO4 demonstrated improved Zn+ ionic exchange and storage efficiency. Moreover, the B-RGO electrode active material exhibited excellent cycle stability. The simple one-step electrochemical technique is the most suitable process for boron doping into graphene nanosheets for future energy storage applications.
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IONI, Yulia V. « NANOPARTICLES OF NOBLE METALS ON THE SURFACE OF GRAPHENE FLAKES ». Periódico Tchê Química 17, no 36 (20 décembre 2020) : 1199–211. http://dx.doi.org/10.52571/ptq.v17.n36.2020.1215_periodico36_pgs_1199_1211.pdf.

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Carbon is a spread element that has many different reaction combinations. Obtaining new composite materials based on nanoparticles is a very actual and perspective topic because nanoparticles possess unique properties. These properties are retained and even amplified when nanoparticles are located in various matrixes. Furthermore, nowadays, the creation of graphene-based composites and graphene-related structures is a promising area of synthesis of composite nanomaterials. Previous research has determined that graphene has a unique set of electrophysical, thermal, optical, and mechanical properties. In this study, the synthesis of nanocomposites representing nanoparticles of noble metals (Au, Pd, Rh) on the surface of graphene flakes were carried out, and the study of their composition, structure, physical and chemical properties, and possible applications in catalysis. The immobilization of nanoparticles on the surface of graphene oxide and graphene was developed, and the original method of synthesis of nanocomposite noble metal nanoparticles on the graphene flakes surface using supercritical isopropanol as a reduction agent for the transformation of graphene oxide into graphene was created. The study of physical and chemical properties of the obtained nanocomposites and results of the study of obtained nanocomposites as catalysts for model organic reactions of cross-coupling and hydroformylation showed that it is possible to create the graphene-based nanostructures as effective functional nanomaterials. Research on the synthesis of graphene compounds and its unique physical properties form a promising direction in the chemistry and physics of new inorganic functional materials. The resulting nanocomposites can be used in such branches as electrodes for LEDs and solar cells, field-effect transistors, supercapacitors, sensors, fuel cells.
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Lu, Li, Hua Tian, Junhui He et Qiaowen Yang. « Graphene–MnO2 Hybrid Nanostructure as a New Catalyst for Formaldehyde Oxidation ». Journal of Physical Chemistry C 120, no 41 (10 octobre 2016) : 23660–68. http://dx.doi.org/10.1021/acs.jpcc.6b08312.

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Dimitrakakis, Georgios K., Emmanuel Tylianakis et George E. Froudakis. « Pillared Graphene : A New 3-D Network Nanostructure for Enhanced Hydrogen Storage ». Nano Letters 8, no 10 (8 octobre 2008) : 3166–70. http://dx.doi.org/10.1021/nl801417w.

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Ominato, Yuya, et Mikito Koshino. « Orbital magnetism of graphene nanostructures ». Solid State Communications 175-176 (décembre 2013) : 51–61. http://dx.doi.org/10.1016/j.ssc.2013.09.023.

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Karthikeyan, S., M. Selvapandiyan et A. Sankar. « Electrochemical performance of reduced graphene oxide (rGO) decorated lanthanum oxide (La2O3) composite nanostructure as asymmetric supercapacitors ». Inorganic Chemistry Communications 139 (mai 2022) : 109331. http://dx.doi.org/10.1016/j.inoche.2022.109331.

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Ferraiuolo, Raffaella, Michela Alfe, Valentina Gargiulo, Giovanni Piero Pepe, Francesco Tafuri, Alessandro Pezzella, Giovanni Ausanio et Domenico Montemurro. « Insights into the Electrical Characterization of Graphene-like Materials from Carbon Black ». Coatings 12, no 11 (21 novembre 2022) : 1788. http://dx.doi.org/10.3390/coatings12111788.

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A new class of graphene-related materials (GRMs) obtained as water suspensions through a two-step oxidation/reduction of a nanostructured carbon black, namely graphene-like (GL) materials, has recently emerged. GL materials undergo self-assembly in thin amorphous films after drying upon drop-casting deposition on different surfaces. The GL films, with thicknesses of less than a micron, were composed of clusters of nanoparticles each around 40 nm in size. The exploitation of the GL films for different options (e.g., bioelectronic, sensoristic, functional filler in composite) requires a deep characterization of the material in terms of their electric transport properties and their possible interaction with the surface on which they are deposited. In this work, a careful electrical characterization of GL films was performed at room temperature and the results were compared with those achieved on films of benchmark graphenic materials, namely graphene oxide (GO) materials, obtained by the exfoliation of graphite oxide, which differ both in morphology and in oxidation degree. The results indicate a non-linear current–voltage relationship for all the investigated films. The extrapolated dielectric constant (ε) values of the investigated GRMs (GL and GO materials) agree with the experimental and theoretically predicted values reported in the literature (ε~2–15). Because similar conductance values were obtained for the GL materials deposited on glass and silicon oxide substrates, no significant interactions of GL materials with the two different substrates were highlighted. These results are the starting point for boosting a feasible use of GL materials in a wide spectrum of applications, ranging from electronics to optics, sensors, membranes, functional coatings, and biodevices.
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Kim, Seong-Eun, Jin-Kook Yoon et In-Jin Shon. « Rapid Sintering of Nanostructured WC-Graphene Composites and Their Mechanical Properties ». Journal of Nanoscience and Nanotechnology 20, no 7 (1 juillet 2020) : 4436–39. http://dx.doi.org/10.1166/jnn.2020.17579.

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The current concern about WC focuses on its low fracture toughness below the ductile-brittle transition temperature despite its many attractive properties. To improve its mechanical properties, the approach generally utilized has been the addition of a second phase to form composites and to make nanostructured materials. In this paper, graphene was evaluated as the reinforcing agent in WC ceramics using a novel sintering method (high-frequency induction heated sintering method). Highly dense nanostructured WC and WC-graphene composites were obtained within two min at 1550 °C. The effect of graphene on the grain size and the mechanical properties (hardness and fracture toughness) of WC-graphene composites was evaluated.
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Han, Qingyan, Zhu Lu, Wei Gao, Meng Wu, Yongkai Wang, Zhongyu Wang, Jianxia Qi et Jun Dong. « Three-dimensional AuAg alloy NPs/graphene/AuAg alloy NP sandwiched hybrid nanostructure for surface enhanced Raman scattering properties ». Journal of Materials Chemistry C 8, no 36 (2020) : 12599–606. http://dx.doi.org/10.1039/d0tc02752a.

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Ye, Shizhuo, Ruohua Zhu, Qijun Huang, Jin He, Hao Wang, Yawei Lv et Sheng Chang. « A transport isolation by orbital hybridization transformation toward graphene nanoribbon-based nanostructure integration ». Nanotechnology 29, no 45 (7 septembre 2018) : 455704. http://dx.doi.org/10.1088/1361-6528/aadc75.

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Krasnova, Anna O., Nadezhda V. Glebova, Angelina G. Kastsova, Maxim K. Rabchinskii et Andrey A. Nechitailov. « Thermal Stabilization of Nafion with Nanocarbon Materials ». Polymers 15, no 9 (27 avril 2023) : 2070. http://dx.doi.org/10.3390/polym15092070.

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The stability of Nafion–carbon composites is important for the efficient functioning of fuel cells. The thermal decomposition of Nafion, nanostructured carbon materials, such as multi-walled carbon nanotubes, graphene-like materials, and their composites, have been studied using constant heating rate thermogravimetry in air. Materials were characterized by quantitative and qualitative analysis methods, such as thermogravimetry, X-ray photoelectron spectroscopy, scanning, and transmission electron microscopy with field emission. In Nafion–carbon composites, an increase in the thermal stability of the Nafion polymer is observed due to the formation of surface compounds at the Nafion–carbon interface. In this case, the degree of stabilization is affected by both the component composition of the composite and the structure of the nanocarbon material. The greatest effect was obtained in the case of using thermally expanded graphite (few-layer graphene). Nafion is distributed to a greater extent over the surface of the carbon material due to its high structural accessibility. The most thermally stable composite is Nafion–graphene in a mass ratio of components 1:4 with one stage Nafion degradation at 422 °C, whereas the degradation of pristine Nafion occurs in three stages at 341, 413, and 430 °C. The dependences of thermal stability and features of thermal degradation on the composition and structure of composites are discussed.
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Alharbi, Raed, Mehrdad Irannejad et Mustafa Yavuz. « A Short Review on the Role of the Metal-Graphene Hybrid Nanostructure in Promoting the Localized Surface Plasmon Resonance Sensor Performance ». Sensors 19, no 4 (19 février 2019) : 862. http://dx.doi.org/10.3390/s19040862.

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Localized Surface Plasmon Resonance (LSPR) sensors have potential applications in essential and important areas such as bio-sensor technology, especially in medical applications and gas sensors in environmental monitoring applications. Figure of Merit (FOM) and Sensitivity (S) measurements are two ways to assess the performance of an LSPR sensor. However, LSPR sensors suffer low FOM compared to the conventional Surface Plasmon Resonance (SPR) sensor due to high losses resulting from radiative damping of LSPs waves. Different methodologies have been utilized to enhance the performance of LSPR sensors, including various geometrical and material parameters, plasmonic wave coupling from different structures, and integration of noble metals with graphene, which is the focus of this report. Recent studies of metal-graphene hybrid plasmonic systems have shown its capability of promoting the performance of the LSPR sensor to a level that enhances its chance for commercialization. In this review, fundamental physics, the operation principle, and performance assessment of the LSPR sensor are presented followed by a discussion of plasmonic materials and a summary of methods used to optimize the sensor’s performance. A focused review on metal-graphene hybrid nanostructure and a discussion of its role in promoting the performance of the LSPR sensor follow.
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