Silicon-Based Optoelectronic Tongue for Label-Free and Nonspecific Recognition of Vegetable Oils.

A special electronic tongue system based on photoelectric measurements on Si-Si/SiN sensitive structures is reported. The sensing approach is based on measuring of minority carrier lifetime in silicon-based substrates using microwave-detected photoconductance decay. This inexpensive and environmentally friendly combinatorial electronic sensing platform is able to create characteristic electronic fingerprints of liquids, detect, and recognize them.