Now showing items 21-40 of 91

  • Effects of graphene nanoplatelets on the morphology of polycarbonate-graphene composite foams prepared by supercritical carbon dioxide two-step foaming 

    Gedler, Gabriel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (2015-05)
    Article
    Open Access
    Low density polycarbonate foams containing different amounts of graphene nanoplatelets with variable cellular morphologies were prepared using a supercritical carbon dioxide two-step foaming process, which consisted of the ...
  • Elastic bending modulus of monolayer graphene 

    Lu, Q; Arroyo Balaguer, Marino; Huang, R (2009-05)
    Article
    Open Access
    An analytic formula is derived for the elastic bending modulus of monolayer graphene based on an empirical potential for solid-state carbon atoms. Two physical origins are identified for the non-vanishing bending stiffness ...
  • Electrical control of optical emitter relaxation pathways enabled by graphene 

    Tielrooij, K. J.; Orona, L.; Ferrier, A.; Badioli, M.; Navickaite, G.; Coop, S.; Nanot, S.; Kalinic, B.; Cesca, T.; Gaudreau, L.; Ma, Q.; Centeno, A.; Pesquera, A.; Zurutuza, A.; Riedmatten, H. de; Goldner, P.; García de Abajo, Francisco Javier; Jarillo-Herrero, P.; Koppens, Frank H. L. (Nature Publishing Group, 2015-01-19)
    Article
    Open Access
    Controlling the energy flow processes and the associated energy relaxation rates of a light emitter is of fundamental interest and has many applications in the fields of quantum optics, photovoltaics, photodetection, ...
  • Electrically tunable nonlinear plasmonics in graphene nanoislands 

    Garcia de Abajo, Francisco Javier; Cox, Joel D. (Nature Publishin group, 2014-12-11)
    Article
    Open Access
    Nonlinear optical processes rely on the intrinsically weak interactions between photons enabled by their coupling with matter. Unfortunately, many applications in nonlinear optics are severely hindered by the small response ...
  • Electromagnetic shielding effectiveness of polycarbonate/graphene nanocomposite foams processed in 2-steps with supercritical carbon dioxide 

    Gedler, Gabriel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio; Ozisik, Rahmi (2015)
    Article
    Open Access
    The electromagnetic interference (EMI) shielding properties of polycarbonate/graphene composites foamed with supercritical carbon dioxide were investigated as a function of cellular morphology and graphene particle dispersion. ...
  • El Grafeno. Parte II: procesos y viabilidad de su producción 

    Mayora Curzio, Carlos A.; Cremades Oliver, Lázaro Vicente; Cusidó Fàbregas, Joan Antoni (2015-07)
    Article
    Open Access
    Ante el descubrimiento del grafeno, un material con propiedades de gran interés tecnológico, la industria busca optimizar sus mecanismos de producción con el objetivo de abordar un mercado para el cual se prevé un gran ...
  • Energy-dependent path of dissipation in nanomechanical resonators 

    Güttinger, Johannes; Noury, Adrien; Weber, Peter; Martin Eriksson, Axel; Lagoin, Camille; Moser, Joel; Eichler, Christopher; Wallraff, Andreas; Isacsson, Andreas; Bachtold, Adrian (Nature, 2017-05-15)
    Article
    Open Access
    Energy decay plays a central role in a wide range of phenomena1,2,3, such as optical emission, nuclear fission, and dissipation in quantum systems. Energy decay is usually described as a system leaking energy irreversibly ...
  • Enhanced electrical conductivity in graphene-filled polycarbonate nanocomposites by microcellular foaming with sc-CO2 

    Gedler, Gabriel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio (2016-01)
    Article
    Open Access
    Electrically conductive polycarbonate (PC) foams containing a low concentration of graphene nanoplatelets (0.5 wt.%) were produced with variable range of expansion ratio by applying a high-pressure batch foaming process ...
  • Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process 

    Gedler, Gabriel; Antunes, Marcelo de Sousa Pais; Velasco Perero, José Ignacio; Ozisik, Rahmi (2016-01)
    Article
    Open Access
    The dielectric and electromagnetic interference (EMI) shielding properties of polycarbonate/graphene nanocomposites foamed using supercritical carbon dioxide were studied as a function of their cellular and compositemorphology. ...
  • Enhanced graphene nonlinear response through geometrical plasmon focusing 

    Saavedra, J. R. M.; García de Abajo, F. Javier (AIP, 2018-01-01)
    Article
    Open Access
    We propose a simple approach to couple light into graphene plasmons and focus these excitations at focal spots of a size determined by the plasmon wavelength, thus producing high optical field enhancement that boosts the ...
  • Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods 

    Atout, H.; Alvarez, Mayra G; Chebli, D.; Bouguettoucha, A.; Tichit, Didier; Llorca Piqué, Jordi; Medina Cabello, Francisco (2017-11)
    Article
    Open Access
    In this study, two different preparation methods of titanium dioxide nanoparticles/reduced graphene oxide nanocomposites were investigated using direct sol-gel method followed by hydrothermal treatment or simple hydrothermal ...
  • Establishing nanoscale heterogeneity with nanoscale force measurements 

    Chang, Yun-Hsiang, Yun-Hsiang; Olukan, Tuza; Lai, Chia-Yun; Santos, Sergio; Lin, Tze-Yu; Apostoleris, Harry; Font Teixidó, Josep; Barcons Xixons, Víctor; Chiesa, Matteo (2015-08-13)
    Article
    Open Access
    Establishing the presence or absence of nanoscale compositional heterogeneity with nanoscale resolution is becoming instrumental for the development of many fields of science. Force versus distance measurements and parameters ...
  • Estudio de viabilidad de una planta de producción de grafeno 

    Mayora Curzio, Carlos Alfredo (Universitat Politècnica de Catalunya, 2014-06)
    Master thesis (pre-Bologna period)
    Open Access
    Ante el reciente descubrimiento del grafeno, un nuevo material con propiedades de gran interés tecnológico, la industria busca optimizar sus mecanismos de producción con el objetivo de abordar un mercado para el cual se ...
  • Extraordinary linear dynamic range in laser-defined functionalized graphene photodetectors 

    Sanctis, Adolfo De; Jones, Gareth F.; Wehenkel, Dominique J.; Bezares, Francisco; Koppens, Frank H. L.; Craciun, Monica F.; Russo, Saverio (Science, 2017-05-26)
    Article
    Open Access
    Graphene-based photodetectors have demonstrated mechanical flexibility, large operating bandwidth, and broadband spectral response. However, their linear dynamic range (LDR) is limited by graphene’s intrinsic hot-carrier ...
  • Fast and sensitive terahertz detection using an antenna-integrated graphene pn-junction 

    Castilla, Sebastián; Terrés, Bernat; Autore, Marta; Viti, Leonardo; Li, Jian; Nikitin, Alexey Y.; Vangelidis, Ioannis; Watanabe, Kenji; Taniguchi, Takashi; Lidorikis, Elefterios; Vitiello, Miriam S.; Hillenbrand, Rainer; Tielrooij, Klaas-Jan; Koppens, Frank H.L. (ACS, 2019-03-18)
    Article
    Restricted access - publisher's policy
    Although the detection of light at terahertz (THz) frequencies is important for a large range of applications, current detectors typically have several disadvantages in terms of sensitivity, speed, operating temperature, ...
  • Fundamentals of graphene-enabled wireless on-chip networking 

    Abadal Cavallé, Sergi; Llatser Martí, Ignacio; Mestres Sugrañes, Albert; Solé Pareta, Josep; Alarcón Cot, Eduardo José; Cabellos Aparicio, Alberto (Springer, 2017)
    Part of book or chapter of book
    Restricted access - publisher's policy
    The book presents the state of art in the emerging field of molecular and nanoscale communication. It gives special attention to fundamental models, and advanced methodologies and tools used in the field. It covers a wide ...
  • Graphene-based multimode interference device design for optical switching applications 

    T'jollyn, Servaas (Universitat Politècnica de Catalunya, 2018-08-27)
    Master thesis
    Open Access
    Covenantee:  Vrije Universiteit Brussel / Universiteit Gent
    The relatively small size and low energy consuming switching potential offered by graphene-based electro-optic and electro-absorption switches has attracted a lot of attention in the photonics community recently and there ...
  • Graphene-based terahertz antennas for area-constrained applications 

    Abadal Cavallé, Sergi; Hosseininejad, Seyed Ehsan; Cabellos Aparicio, Alberto; Alarcón Cot, Eduardo José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Open Access
    Graphene is enabling a plethora of applications in a wide range of fields due to its unique electrical, mechanical, and optical properties. In the realm of wireless communications, graphene shows great promise for the ...
  • Graphene-enabled Photonic Networks On-Chip 

    Hurtado Martínez, David (Universitat Politècnica de Catalunya, 2015-02)
    Bachelor thesis
    Restricted access - confidentiality agreement
  • Graphene-enabled wireless communication for massive multicore architectures 

    Abadal Cavallé, Sergi; Alarcón Cot, Eduardo José; Cabellos Aparicio, Alberto; Lemme, Max; Nemirovsky, Mario (2013-11-11)
    Article
    Restricted access - publisher's policy
    Current trends in microprocessor architecture design are leading towards a dramatic increase of core-level parallelization, wherein a given number of independent processors or cores are interconnected. Since the main ...