Solution processed organic transistor chip for multiplexed selective ion sensing

This work introduces a simple solution processed solid-state organic transistor sensor chip for multiplexed and selective ion sensing. The multi-ion sensing chip is capable of selectively detecting potassium (K+), sodium (Na+) and calcium (Ca2+) ions at physiologically relevant concentrations.The sensors are responsive to 4-5 decades of each primary ion. When a response from interfering ions is seen at higher concentrations, the sensors can uniquely discriminate between primary and interfering ions by a difference in the polarity of the current modulation.