We report the creation of a low flow rate air flow sensor from PEDOT
micro-hairs. The hairs are printed as pipette-defined depositions using a
nanopositioning system. The printing technique was developed for fabricating
structures in 2D and 3D.
Here micro-hairs with diameters of 4.4 μm were
repeatedly extruded with constant heights. These hairs were then applied to
produce a prototype flow rate sensor, which was shown to detect flows of
3.5 l min−1.
Structural analysis was performed to demonstrate that the
design can be modified to potentially observe flows as low as
0.5 l min−1. The results are extended to propose a
practical digital flow rate sensor.
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