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