Abstract
Conjugated polymers (CPs) are emerging as part of a promising future for gas-sensing applications. However, some of their limitations, such as poor specificity, humidity sensitivity and poor ambient stability, remain persistent. Herein, a novel combination of a polymer-monomer heterostructure, derived from a CP (PDVT-10) and a newly reported monomer [tris(keto-hydrazone)] has been integrated in an organic field-effect transistor (OFET) platform to sense H2S selectively. The hybrid heterostructure shows an unprecedented sensitivity (525% ppm-1) and high selectivity toward H2S gas. In addition, we demonstrated that the PDVT-10/tris(keto-hydrazone) OFET sensor has the lowest limit of detection (1 ppb), excellent ambient stability (∼5% current degradation after 150 days), good response-recovery behavior, and exceptional electrical behavior and gas response reproducibility. This work can help pave the way to incorporate futuristic gas sensors in a multitude of applications.
Highlights
A biological nose is a consortium of multiple sensing and signal conditioning elements, which are key in identifying airborne analytes
The top view of our organic fieldeffect transistor (OFET) gas sensor with specially designed gas-absorbent membranes is shown in Fig. 1
Using a CMOS-compatible approach, we have successfully fabricated a miniaturized OFET sensor whose size measured around 5.0 mm  5.0 mm, which exactly fits on top of the forefinger (Fig. 1d)
Summary
A biological nose is a consortium of multiple sensing and signal conditioning elements, which are key in identifying airborne analytes. When compared to a pristine PDVT-10 OFET device, the developed PDVT-10/ tris(keto-hydrazone) heterostructure sensors exhibit an exceptional 64-fold increase in sensitivity toward H2S gas, with an excellent selectivity when operating at room temperature.
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