NDLI: Multifunctional and responsive surfaces based on fs laser micro/nano structuring of silicon

Content Provider	IEEE Xplore Digital Library
Author	Stratakis, E. Barberoglou, M. Pagkozidis, A. Zorba, V. Mateescu, A. Achilleos, D.S. Vamvakaki, M. Anastasiadis, S.H. Fotakis, C.
Copyright Year	2009
Description	Author affiliation: Lawerence Berkeley National Laboratory, MS70-108B, 1 Cyclotron Rd., Berkeley, CA 94720, USA (Zorba, V.) \|\| Institute of Electronic Structure and Laser, Foundation for Research & Technology Hellas, (IESL-FORTH), P.O. Box 1527, Heraklion, 711 10, Greece (Stratakis, E.; Barberoglou, M.; Pagkozidis, A.; Mateescu, A.; Achilleos, D.S.; Vamvakaki, M.; Anastasiadis, S.H.; Fotakis, C.)
Abstract	Control over the surface morphology of solids as well as manufacturing of functional biomimetic surfaces with special responsive properties, also known as “smart surfaces”, have attracted intense scientific research effort. The recent surge of interest in these responsive systems stems from the widespread number of applications ranging from environmental cleanup to molecular sensors and micro/nano fluidic devices. We report here a methodology for the development of multifunctional responsive surfaces via ablating Si wafers with femtosecond laser pulses and subsequently coating them with different types of functional coatings [1]. The initial laser structured surfaces exhibit controlled dual-scale roughness at both the micro- and the nano-scale, which mimics the hierarchical morphology of responsive surfaces found in nature. Depending on the conformal coating deposited onto these surfaces, the following functionalities and reversible responsive properties are attained: a) pH responsiveness (Fig. 1a): when a polymer brush is “grafted from” these surfaces based on a pH-sensitive polymer, these artificially structured surfaces can alter their behaviour from super-hydrophilic (after immersion in a low pH buffer) to super-hydrophobic and water repellent (following immersion to a high pH buffer), (b) Photo-responsiveness (Fig. 1b): when photo-responsive azobenzene molecules are grafted onto the surface, a dynamic optical control of the wetting properties is obtained and the surface can be switched from super-hydrophilic (after irradiation with UV light) to hydrophobic (following irradiation with visible light), (c) Electro-responsiveness (Fig. 1c): when a conformal oxide layer is thermally grown, a dynamic electrical control of the wettability can be achieved by means of electrowetting and (d) Chemo-responsiveness (Fig. 1d): when the surface is electrochemically etched to form a porous Si layer selective sensitivity to organic solvents is obtained.
Starting Page	1
Ending Page	1
File Size	2416081
Page Count	1
File Format	PDF
ISBN	9781424440795
DOI	10.1109/CLEOE-EQEC.2009.5192319
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-14
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Biomimetics Surface emitting lasers Surface morphology Silicon Surface roughness Pulsed laser deposition Rough surfaces Coatings Optical control Optical polymers
Content Type	Text
Resource Type	Article

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