Multifunctional Responsive Hierarchically Structured Surfaces

Contact Person(s):
Dr. Emmanuel Stratakis

Research is focused on the functionalization of the 3D laser fabricated structures to obtain smart responsive surfaces that change their properties in response to different external stimuli.

Research Topics
Ultrafast Laser Micro- and Nano- processing


Control over the surface morphology of solids as well as manufacturing of functional surfaces with special responsive properties, also known as “smart surfaces”, have been the subject of intense research effort. We have developed an efficient methodology for creating multifunctional responsive surfaces exhibiting dual scale roughness via functionalization of 3D laser fabricated structures with a variety of stimuli responsive coatings. The final surfaces can reversibly switch between superhydrophilicity and superhydrophobicity and water repellency. Depending on the type of coating deposited onto these surfaces, pH-, photo-, electro-, chemo- responsiveness is attained, which can potentially be important for microfluidic applications. In all cases we showed that the responsive properties are fully reversible while the dual-scale roughness induces a dramatic amplification of the surface response to external stimuli.


Dr. Vassilia Zorba, Lawrence Berkeley National Laboratory, CA USA.


  • Tailoring the wetting properties of polymers from highly hydrophilic to superhydrophobic using UV laser pulses
    Pazokian, H., Selimis, A., Barzin, J., Jelvani, S., Mollabashi, M., Fotakis, C., Stratakis E., Journal of Micromechanics and Microengineering, 22, 035001, 2012

  • Properties of Silicon and Metal Oxide Electrowetting Systems
    Papadopoulou, E.L.; Zorba, V. Stratakis E, Fotakis, C., Journal of Adhesion Science and Technology, 26, 2143, 2012

  • Biomimetic micro/nanostructured functional surfaces for microfluidic and tissue engineering applications
    E. Stratakis, A. Ranella, and C. Fotakis, Biomicrofluidics, 5, 013411, 2011

  • Electrowetting Properties of ZnO and TiO2 Nanostructured Thin Films
    Evie L. Papadopoulou, Alexios Pagkozidis, Marios Barberoglou, Costas Fotakis, and Emmanuel Stratakis, Journal of Physical Chemistry C, 114, 10249, 2010

  • Bio-inspired water repellent surfaces produced by ultrafast laser structuring of silicon
    M. Barberoglou, V. Zorba, E. Stratakis, E. Spanakis, P. Tzanetakis, S.H. Anastasiadis and C. Fotakis, Applied Surface Science, 255, 5425, 2009

  • One Pot Direct Hydrothermal Growth of Photoactive TiO2 Films on Glass
    D. Vernardou, E. Stratakis, G. Kenanakis, H.M. Yates, S. Couris, M.E. Pemble, E. Koudoumas, N. Katsarakis, Journal of Photochemistry and Photobiology A, 202, 81, 2009

  • Reversible Photoinduced Wettability Transition of Hierarchical ZnO Structures
    E.L. Papadopoulou, M. Barberoglou, V, Zorba, A. Manousaki, A. Pagkozidis, E. Stratakis and C. Fotakis, Journal of Physical Chemistry C, 113, 2891, 2009

  • Reversible wettability of ZnO nanostructured thin films prepared by pulsed laser deposition
    E. L. Papadopoulou, V. Zorba, A. Pagkozidis, M. Barberoglou, E. Stratakis and C. Fotakis, Thin Solid Films, 518, 1267, 2009

  • Influence Of Solution Chemistry On The Properties Of Hydrothermally Grown TiO2 For Advanced Applications
    D. Vernardou, K. Vlachou, E. Spanakis, E. Stratakis, N. Katsarakis, E. Kymakis and E. Koudoumas, Catalysis Today, 144, 172, 2009

  • Photoinduced hydrophilic and photocatalytic response of hydrothermally grown TiO2 nanostructured thin films
    D. Vernardou, G. Kalorerakis, E. Stratakis, G. Kenanakis E. Koudoumas and N. Katsarakis, Solid State Sciences, 11, 1499, 2009

  • Light-induced reversible hydrophilicity of ZnO structures grown by aqueous chemical growth
    G. Kenanakis, E. Stratakis, K. Vlachou, D. Vernardou, E. Koudoumas, and N. Katsarakis, Applied Surface Science, 254, 5695, 2008

  • Biomimetic artificial surfaces quantitatively reproduce the water repellency of a Lotus leaf
    V. Zorba, E. Stratakis, M. Barberoglou, E. Spanakis, P. Tzanetakis, S.H. Anastasiadis and C. Fotakis, Advanced Materials, 20, 4049, 2008

  • Applications of ultrafast lasers in materials processing: Fabrication on self-cleaning surfaces and scaffolds for tissue engineering
    C. Fotakis, M. Barberoglou, V. Zorba, E. Stratakis, E. L. Papadopoulou, A. Ranella, K. Terzaki, and M. Farsari, Proceedings of SPIE, Laser Physics and Applications 2008, 2008

  • Novel Aspects of Materials Processing by Ultrafast Lasers: From Electronic to Biological and Cultural Heritage Applications
    C. Fotakis, V. Zorba, E. Stratakis, P. Tzanetakis, I. Zergioti, D. G. Papagoglou, K. Sambani, G. Filippidis, M. Farsari, P. Pouli, G. Bounos, S. Georgiou, Journal of Physics: Conference Series, 59, 266, 2007

  • Making silicon hydrophobic: wettability control by two-lengthscale simultaneous patterning with femtosecond laser irradiation
    V. Zorba, L. Persano, D. Pisignano, A. Athanassiou, E. Stratakis, R. Cingolani, P. Tzanetakis and C. Fotakis, Nanotechnology, 17, 3234, 2006

Project Members
Dr. Emmanuel Stratakis
Mr. Ioannis Paradisanos
Prof. Costas Fotakis
Prof. Spiros Anastasiadis
Prof. Maria Vamvakaki

Last Updated:  14/4/2013