In this paper, we present our preliminary results of high aspect ratio 3D PEDOT pillar study by drop-on demand (DOD)
direct printing system. Design of the experimental setup and the fabrication of the DOD PEDOT pillar are introduced.
Currently, the system can achieve a PEDOT pillar with a height of 300 μm and 80 μm in diameter. The proposed
PEDOT 3D printing process has a wide range of potential applications in the eletronics and display industry.
Reliability is one important issue in using PEDOT: PSS as a strain gauge for large strain measurements. In our research,
PEDOT: PSS strain gauge is fabricated on the polyurethane and porous substrate, which enhances the mechanical
property when large strain and cyclic loads are applied to it. Our result shows that with the polyurethane as the substrate
adhesion layer, the strain of PEDOT: PSS can go up to 17.7% and stabilize without reference resistance drifting.
Viscosity measurement by bend loss of fiber is presented. The sensing principle makes use of the damping
characteristic of a vibrating optical fiber probe with fix-free end configuration. By measuring the displacement of the
fiber probe, the viscosity can be determined by matching the probe's displacement with the displacement built in the
database obtained by either experimental method or Finite element calculation. Experimental results are presented by
measuring the sucrose and glycerol solutions of different concentrations with a viscosity varying from 1 to 15 cP.
Stokes' flow assumption is utilized to attenuate the mass density effect and simplify the viscosity measurement.