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Recent research activities in the area of low-cost sensing and diagnostics that are realized on cellulosic paper substrate are presented. First a three-dimensional origami paper-based analytical device (omPAD) with multiple electrochemical sensors, an integrated sample reservoir and tight integration with a custom CMOS potentiostat is presented. Second, an optical sensor array with built-in microfluidic...
A three dimensional paper-based analytical device (PAD) with multiple electrochemical sensors, an integrated sample reservoir and tight integration with a custom CMOS potentiostat is presented. The sensors are fabricated using a combination of wax printing and screen printing using a solution based approach in ambient conditions without the need for expensive fabrication equipment or a cleanroom....
Small biological signals can be resolved in presence of large artifacts using various methods. A layered approach to artifact rejection is presented here, using multiple techniques in a cascade fashion including blanking on the second gain stage. Results show superior performance of a layered approach including fast-settle blanking compared to other methods of rejection.
Lack of accessible medical care in developing countries has prompted a need for low-cost point of care medical diagnostics. Paper based medical diagnostics have been demonstrated as a viable option in these areas due for their simplicity, low-cost and easy disposal. This paper presents a custom CMOS readout IC in conjunction with paper-based electrodes as electrochemical sensors as a low-cost medical...
Large arrays of cross-reactive sensor elements offer the ability to identify vapors from the signature response of the ensemble. We create an array of heterogeneous gas sensing microassemblies using dielectrophoretic assembly of various nanomaterials on silicon. Gas sensitive materials include reduced graphene oxide (rGO) platelets, single wall carbon nanotubes, and copper oxide nanowires. The array...
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