Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 156, Issue 1, Pages 433-443Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.04.078
Keywords
Photopatternable magnetic composite; Superparamagnetic magnetite particles; Agglomerates in polymer composite; Magnetic microcantilevers; Magnetic nanocomposite
Funding
- ETH Zurich [TH-28 06-3]
- SNSF [200020-113350]
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A superparamagnetic nanocomposite obtained by dispersing superparamagnetic magnetite nanoparticles in the epoxy SU-8 is used to fabricate microstructures by photolithography. The dispersion of the nanoparticles and the level of agglomerations are analyzed by optical microscopy, TEM (transmission electron microscope), SAXS (small-angle X-ray scattering), XDC (X-ray disc centrifuge) and XRD (X-ray diffraction). Two different phosphate-based dispersing agents are compared. In order to obtain a high-quality nanocomposite, the influence of particle concentration 1-10 vol.% (4-32 wt.%) on composite fabrication steps such as spin coating and UV exposure are systematically analyzed. Features with narrow widths (down to 1.3 mu m) are obtained for composites with 5 vol.% particle concentration. Mechanical, magnetic and wetting properties of the nanocomposites are characterized. These nanocomposites exhibit superparamagnetic properties with a saturation magnetization up to 27.9 kA m(-1) for 10 vol.%. All nanocomposites show no differences in surface polarity with respect to pure SU-8, and exhibit a moderate hydrophobic behavior (advancing dynamic contact angles approximately 81 degrees). Microcantilevers with particle concentrations of 0-5 vol.% were successfully fabricated and were used to determine the dynamic Young's modulus of the composite. A slight increase of the Young's modulus with increased particle concentration from 4.1 GPa (pure SU-8) up to 5.1 GPa (for 5 vol.%) was observed. (C) 2011 Elsevier B.V. All rights reserved.
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