Sensitive and selective pentacene-guanine field-effect transistor sensing of nitrogen dioxide and interferent vapor analytes.



Citation:

Shi W, Yu J, Katz HE. Sensitive and selective pentacene-guanine field-effect transistor sensing of nitrogen dioxide and interferent vapor analytes. Sensors and Actuators B: Chemical 2018;254:940-948.

Abstract:

The biomolecule guanine and organic semiconductor pentacene were used to form a sensitive and selective organic field-effect transistor (OFET) pair sensitive to nitrogen dioxide gas and five other vapor analytes. OFETs with two configurations were fabricated, one of which used thermally deposited guanine and pentacene layer-by-layer to form the sensing unit, while the other one only adopted pentacene as the sensing element. First, the OFET using the guanine-pentacene sensing unit was more sensitive to nitrogen dioxide gas. Then, these two kinds of OFETs showed opposite responses and/or different response magnitudes to the other vapor analytes. The sensing responses of the two OFETs presented distinct patterns and thus could distinguish individual analytes including nitrogen dioxide. The work demonstrates the application of a low-cost and environmental-friendly biomolecule to organic electronic sensing.