Staff directory

Publications

2017

  • Design of Hierarchical Surfaces for Tuning Wetting Characteristics

    Fernández A., Francone A., Thamdrup L.H., Johansson A., Bilenberg B., Nielsen T., Guttmann M., Sotomayor Torres C.M., Kehagias N. ACS Applied Materials and Interfaces; 9 (8): 7701 - 7709. 2017. 10.1021/acsami.6b13615.

    Patterned surfaces with tunable wetting properties are described. A hybrid hierarchical surface realized by combining two different materials exhibits different wetting states, depending on the speed of impingement of the water droplets. Both "lotus" (high contact angle and low adhesion) and "petal" (high contact angle and high adhesion) states were observed on the same surface without the need of any modification of the surface. The great difference between the capillary pressures exerted by the microstructures and nanostructures was the key factor that allowed us to tailor effectively the adhesiveness of the water droplets. Having a low capillary pressure for the microstructures and a high capillary pressure for the nanostructures, we allow to the surface the possibility of being in a lotus state or in a petal state. © 2017 American Chemical Society.


  • Hierarchical surfaces for enhanced self-cleaning applications

    Fernández A., Francone A., Thamdrup L.H., Johansson A., Bilenberg B., Nielsen T., Guttmann M., Sotomayor Torres C.M., Kehagias N. Journal of Micromechanics and Microengineering; 27 (4, 045020) 2017. 10.1088/1361-6439/aa62bb.

    In this study we present a flexible and adaptable fabrication method to create complex hierarchical structures over inherently hydrophobic resist materials. We have tested these surfaces for their superhydrophobic behaviour and successfully verified their self-cleaning properties. The followed approach allow us to design and produce superhydrophobic surfaces in a reproducible manner. We have analysed different combination of hierarchical micro-nanostructures for their application to self-cleaning surfaces. A static contact angle value of 170 with a hysteresis of 4 was achieved without the need of any additional chemical treatment on the fabricated hierarchical structures. Dynamic effects were analysed on these surfaces, obtaining a remarkable self-cleaning effect as well as a good robustness over impacting droplets. © 2017 IOP Publishing Ltd.


2015

  • Residual layer-free Reverse Nanoimprint Lithography on silicon and metal-coated substrates

    Fernández A., Medina J., Benkel C., Guttmann M., Bilenberg B., Thamdrup L.H., Nielsen T., Sotomayor Torres C.M., Kehagias N. Microelectronic Engineering; 141: 56 - 61. 2015. 10.1016/j.mee.2014.11.025. IF: 1.197

    In this work we demonstrate that Reverse Nanoimprint Lithography is a feasible and flexible lithography technique applicable to the transfer of micro and nano polymer structures with no residual layer over areas of cm2 areas on silicon, metal and non-planar substrates. We used a flexible polydimethylsiloxane stamp with hydrophobic features. We present residual layer-free patterns imprinted using a commercial poly(methylmethacrylate) thermoplastic polymer over silicon, nickel and pre-patterned substrates. Our versatile patterning technology is adaptable to free form nano structuring and has coupling to adhesion technologies. © 2014 Elsevier B.V. All rights reserved.


2014

  • Embedded inkjet printed silver grids for ITO-free organic solar cells with high fill factor

    Burgués-Ceballos, I.; Kehagias, N.; Sotomayor-Torres, C.M.; Campoy-Quiles, M.; Lacharmoise, P.D. Solar Energy Materials and Solar Cells; 127: 50 - 57. 2014. 10.1016/j.solmat.2014.03.024. IF: 5.030


  • Hypersonic phonon propagation in one-dimensional surface phononic crystal

    Graczykowski, B.; Sledzinska, M.; Kehagias, N.; Alzina, F.; Reparaz, J.S.; Sotomayor Torres, C.M. Applied Physics Letters; 2014. 10.1063/1.4870045. IF: 3.515


  • Order quantification of hexagonal periodic arrays fabricated by in situ solvent-assisted nanoimprint lithography of block copolymers

    Simão, C.; Khunsin, W.; Kehagias, N.; Salaun, M.; Zelsmann, M.; Morris, M.A.; Sotomayor Torres, C.M. Nanotechnology; 2014. 10.1088/0957-4484/25/17/175703. IF: 3.672


2013

  • Fabrication of highly ordered sub-20 nm silicon nanopillars by block copolymer lithography combined with resist design

    Salaun, M.; Zelsmann, M.; Archambault, S.; Borah, D.; Kehagias, N.; Simao, C.; Lorret, O.; Shaw, M.T.; Sotomayor Torres, C.M.; Morris, M.A. Journal of Materials Chemistry C; 1 (22): 3544 - 3550. 2013. 10.1039/c3tc30300d. IF: 6.108


  • Lasing in nanoimprinted two-dimensional photonic crystal band-edge lasers

    Reboud, V.; Romero-Vivas, J.; Lovera, P.; Kehagias, N.; Kehoe, T.; Redmond, G.; Sotomayor Torres, C.M. Applied Physics Letters; 2013. 10.1063/1.4790646. IF: 3.794


  • Metallic nanoparticles enhanced the spontaneous emission of semiconductor nanocrystals embedded in nanoimprinted photonic crystals

    Reboud, V.; Lévêque, G.; Striccoli, M.; Placido, T.; Panniello, A.; Curri, M.L.; Alducin, J.A.; Kehoe, T.; Kehagias, N.; Mecerreyes, D.; Newcomb, S.B.; Iacopino, D.; Redmond, G.; Torres, C.M.S. Nanoscale; 5 (1): 239 - 245-245. 2013. 10.1039/c2nr32134c. IF: 6.233


  • Robust spin crossover platforms with synchronized spin switch and polymer phase transition

    Novio, F.; Evangelio, E.; Vazquez-Mera, N.; González-Monje, P.; Bellido, E.; Mendes, S.; Kehagias, N.; Ruiz-Molina, D. Scientific Reports; 3 2013. 10.1038/srep01708. IF: 2.927


  • Soft-graphoepitaxy using nanoimprinted polyhedral oligomeric silsesquioxane substrates for the directed self-Assembly of PS-b-PDMS

    Borah, D.; Simao, C.D.; Senthamaraikannan, R.; Rasappa, S.; Francone, A.; Lorret, O.; Salaun, M.; Kosmala, B.; Kehagias, N.; Zelsmann, M.; Sotomayor-Torres, C.M.; Morris, M.A. European Polymer Journal; 49 (11): 3512 - 3521-3521. 2013. 10.1016/j.eurpolymj.2013.08.011. IF: 2.562


2012

  • Enhanced light extraction in ITO-free OLEDs using double-sided printed electrodes

    Reboud, V.; Khokhar, A.Z.; Sepúlveda, B.; Dudek, D.; Kehoe, T.; Cuffe, J.; Kehagias, N.; Lira-Cantu, M.; Gadegaard, N.; Grasso, V.; Lambertini, V.; Sotomayor Torres, C.M. Nanoscale; 4 (11): 3495 - 3500. 2012. .


  • Polymer photonic band-gaps fabricated by nanoimprint lithography.

    Reboud, V. ; Kehoe, T.; Romero Vivas, J.; Kehagias, N.; Zelsmannd, M.; Alsina, F.; Sotomayor Torres, C.M. Photonics and Nanostructures - Fundamentals and Applications; 10: 632 - 635. 2012. .


  • Soft graphoepitaxy of hexagonal PS-b-PDMS on nanopatterned POSS surfaces fabricated by nanoimprint lithography

    Simao, C.; Francone, A.; Borah, D.; Lorret, O.; Salaun, M.; Kosmala, B. ; Shaw, M.T.; Dittert, B.; Kehagias, N.; Zelsmann, M.; Morris, M.A.; Sotomayor Torres, C.M. Journal of Photopolymer Science and Technology; 25(2): 239 - 244. 2012. .


2011

  • Direct top-down ordering of diblock copolymers through nanoimprint lithography

    Salaün, M.; Kehagias, N.; Salhi, B.; Baron, T.; Boussey, J.; Sotomayor Torres, C.M.; Zelsmann, M. Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures; 29 2011. 10.1116/1.3662399.


  • Fine control of critical dimension for the fabrication of large bandgap high frequency photonic and phononic crystals

    Cuffe, J. ; Dudek, D.; Kehagias, N.; Chapuis, P.O.; Reboud, V.; Alsina, F. ; McInerney, J.G.; Sotomayor Torres, C.M. Microelectronic Engineering; 2011. .


  • Low temperature direct imprint of polyhedral oligomeric silsesquioxane (POSS) resist

    Kehagias, N.; Zelsmann, M.; Chouiki, M.; Francone, A.; Reboud, V.; Schoeftner, R.; Sotomayor Torres, C. Microelectronic Engineering; 2011. .


  • Surface-Directed Dewetting of a Block Copolymer for Fabricating Highly Uniform Nanostructured Microdroplets and Concentric Nanorings

    Farrell, R.A.; Kehagias, N.; Shaw, M.T.; Reboud, V.; Zelsmann, M.; Holmes, J.D.; Sotomayor Torres, C.M.; Morris, M.A. ACS Nano; 2011. .


2010

  • Tuning the Intensity of Metal-Enhanced Fluorescence by Engineering Silver Nanoparticle Arrays

    Yang, B.; Lu, N.; Qi, D.; Ma, R.; Wu, A.; Hao, J.; Liu, X.; Mu, Y.; Reboud, V.; Kehagias, N.;Sotomayor Torres, C.M.; Yin Chiang Boey, F.; Chen, X.; Chi, L. Small; 2010. .


2009

  • Inline metrology configuration for sub-wavelength diffraction using microscope optics

    T. Kehoe; V. Reboud; N.Kehagias; C.M. Sotomayor Microelectronic Engineering; 86 (04-juny): 1036 - 1039. 2009. .


  • Nanoimprinted plasmonic crystals for light extraction applications

    V. Reboud; N. Kehagias; T. Kehoe; G. Leveque; C. Mavidis; M. Kafesaki.; C.M. Sotomayor Microelectronic Engineering; 87: 1367 - 1369. 2009. 10.1016/j.mee.2009.12.030.


  • Stamp replication for thermal and UV nanoimprint lithography using a UV sensitive silsesquioxane resist

    N. Kehagias; V. Reboud; J.de Girolamo; M. Chouiki; M. Zelsmann; J. Boussey; C.M. Sotomayor Microelectronic Engineering; 86: 1036 - 1039. 2009. 10.1016/j.mee.2009.01.052.


  • Tuning the intensity of metal enhanced fluorescence by engineering silver nanoparticle arrays

    B. Yang; N. Lu; D. Qi; Q. Wu; J. Hao; R. Ma; X. Liu; Y. Mu; V. Reboud; N. Kehagias; C. M. Sotomayor; F.Y. Chiang; X. Chen and L. Chi Small; 6 (9): 1038 - 1043. 2009. 10.1002/smll.200902350.


2008

  • Fabrication of defect-free nanoimprinted photonic crystal for laser applications

    V Reboud; N Kehagias; M Striccoli; T Placido; A Panniello; M L Curri; M Zelsmann; F Reuther; G Gruetzner; C M Sotomayor Torres Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes; 47: 5139 - 5141. 2008. 10.1143/JJAP.47.5139.


  • Modification of spontaneous emission of (CdSe)ZnS nanocrystals embedded in nanoimprinted photonic crystals

    V. Reboud; N. Kehagias; M. Zelsmann; M. Striccoli; M. Tamborra; M. L. Curri; A. Agostiano; M. Fink; F. Reuther; G. Gruetzner; C. M. Sotomayor Torres Journal of Nanoscience and Nanotechnology; 8: 535 - 539. 2008. 10.1166/jnn.2008.A143.


  • Nanoimprint lithography and surface modification as prospective technologies for heterogeneous integration

    N Kehagias; W Hu; N Lu; L Chi; H Fuchs; A Genua; J A Alduncin; J A Pomposo; D Mecerreyes; C M Sotomayor Torres Physica Status Solidi (C) Current Topics in Solid State Physics; 5: 3671 - 3575. 2008. 10.1002/pssc.200780226 .


  • Residual layer thickness in nanoimprint: experiments and coarse-grain simulation

    N Kehagias; V Reboud; C M Sotomayor Torres; V Sorotin; A Svintsov; S Zaitsev Microelectronic Engineering; 85: 846 - 849. 2008. 10.1016/j.mee.2007.12.041.


2007

  • Embedded nano channels fabricated by non-selective reverse contact UV nanoimprint lithography technique

    N. Kehagias; G. Chansin; V. Reboud; M. Zelsmann; C. Schuster; M. Kubenz; F. Reuther; G. Gruetzner; C. M. Sotomayor Torres Microelectronic Engineering; 10: 1016. 2007. .


  • Functional patterns obtained by nanoimprinting lithography and subsequent growth of polymer brushes

    A Genua; J. A. Alduncín; J. A. Pomposo; N Kehagias; V. Reboud; C. M. Sotomayor Torres; D. Mecerreyes Nanotechnology; 2007. 10.1088/0957-4484/18/21/215301.


  • Multicolor Emission on Prepatterned Substrates Using a Single Dye Species

    W. Hu; N. Lu; H. Zhang; Y. Wang; N. Kehagias; V. Reboud; C. M. Sotomayor Torres; J. Hao; W. Li; H. Fuchs; L. Chi Advanced Materials; 19: 2119 - 2123. 2007. 10.1002/adma.200602491.


  • Photoluminescence enhancement in metallic nanocomposite printable polymer

    V. Reboud; N. Kehagias; M. Striccoli; T. Placido; A. Panniello; M. L. Curri; M. Zelsmann; F. Reuther; G. Gruetzner; C. M. Sotomayor Torres Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures; 2007. .


  • Photoluminescence enhancement in nanoimprinted photonic crystals and coupled surface plasmons

    V. Reboud; N. Kehagias; M. Zelsmann; C. Schuster; M. Fink; F. Reuther; G. Gruetzner; C. M. Sotomayor Torres Optics Express; 2007. .


  • Reverse-contact UV nanoimprint lithography for multilayered structure fabrication

    N Kehagias; V Reboud; G Chansin; M Zelsmann; C Jeppesen; C Schuster; M Kubenz; F Reuther; G Gruetzner; C M Sotomayor Torres Nanotechnology; 2007. .


  • Spontaneous emission control of colloidal nanocrystals using nanoimprinted photonic crystals,

    V. Reboud; N. Kehagias; M. Zelsmann; M. Striccoli; M. Tamborra; M. L. Curri; A. Agostiano; M. Fink; F. Reuther; G. Gruetzner; C. M. Sotomayor Torres Applied Physics Letters; 90: 11114. 2007. .


  • Spontaneous emission of nanocrystals in nanoimprinted photonic structures

    V. Reboud; N. Kehagias; M. Zelsmann; M. Striccoli; M. Tamborra; M. L. Curri; A. Agostiano; M. Fink; F. Reuther; G. Gruetzner; C. M. Sotomayor Torres Microelectronic Engineering; 10: 1016. 2007. .


  • Two-dimensional polymer photonic crystal band-edge lasers fabricated by nanoimprint lithography

    V. Reboud; P. Lovera; N. Kehagias; M. Zelsmann; C. Schuster; F. Reuther; G. Gruetzner; G. Redmond; C. M. Sotomayor Torres Applied Physics Letters; 91: 15110. 2007. .