Abstract
We have fabricated a terahertz compatible polytetrafluoroethylene (PTFE) based microfluidic flow-cell, in which terahertz time-domain spectroscopy of a range of concentrations of aqueous bovine serum albumin (BSA) was performed, demonstrating the device’s suitability for future studies of biomolecular interactions. The novel combination of oxygen plasma treatments and milling was used to both increase and decrease the wettability of the channel and surrounding substrate (to superhydrophobic levels) respectively, producing a stark contrast in contact angles allowing surface tension effects to confine liquid in the channel. PTFE is a chemically inert, bio-compatible material with ideal spectroscopic properties at sub-millimetre wavelengths.
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