Contactless conductivity detector from printed circuit board for paper-based analytical systems.

This work presents a capacitively coupled contactless conductivity detector (CD) etched out from a printed circuit board (PCB) as potential sensor for paper-based analytical systems. Two lines of any desirable pattern forming 35-μm thick planar copper electrodes were produced on a PCB plate (40 mm × 60 mm) by photolithography. The final PCB plate was covered with polypropylene film to serve as the insulating layer for the CD detector.