This paper reports ex-situ preparation of conductive polymer/single-walled carbon nanotubes (SWNTs) nanocomposites by adding high conductive SWNTs to the polymer matrix. Sonication methods were used to disperse the SWNTs in the polymer. The conductivity of the nanocomposites is tuned by increasing the concentration of SWNTs. Furthermore, we present two-photon polymerization (2PP) method to fabricate structures on the basis of conductive photosensitive composites. The conductive structures were successfully generated by means of 2PP effect induced by a femtosecond laser.
Microassembling with holographic optical tweezers (HOT) is a flexible manufacturing technology for the precise
fabrication of complex microstructures. In contrast to classical direct writing techniques, here, microparticles are
transported within a fluid to appropriate positions, where they are finally bound. Therefore, optical forces act against the
inner friction of the fluid. This effect limits the microassembling process in the meaning of process speed. In this work
we investigate these limitations depending on the applied laser power and particle size. Additionally, different to
conventional optical tweezers, HOTs use spatial light modulators (SLM) to control the laser beam and the object's
position. This is performed at discrete step sizes caused by successively imaging respective kinoforms on the SLM at
specific refresh rates. An optimization of the step size and the applied update rate are crucial to reach maximum
velocities in particle movement. Therefore, the performance of dynamic particle manipulation is investigated in
individual experiments. Stable manipulation velocities of up to 114 μm/s have been reported in our work using 6 μm
polystyrene particles and an applied laser power of 445 mW.
This work reports the preparation of polymer/TiO2 nanocomposite by adding TiO2 nanoparticles to the polymer matrices.
TiO2 nanoparticles can be effectively dispersed into the polymer. The refractive index of the nanocomposites can be
tuned by increasing the concentration of TiO2 nanoparticles. The prepared samples exhibit excellent optical transparency
in the Vis-NIR region, i.e. at two-photon polymerization (TPP) processing wavelength, and can be used to write threedimensional
structures by means of TPP. Structures with high refractive index have been produced with the novel ultrahigh
resolution technology based on TPP processing of polymer/TiO2 nanocomposites.