Abstract
Modern solid-state gas sensors approaching ppb-level limit of detection open new perspectives for process control, environmental monitoring and exhaled breath analysis. Organic field-effect transistors (OFETs) are especially promising for gas sensing due to their outstanding sensitivities, low cost and small power consumption. However, they suffer of poor selectivity, requiring development of cross-selective arrays to distinguish analytes, and environmental instability, especially in humid air. Here we present the first fully integrated OFET-based electronic nose with the whole sensor array located on a single substrate. It features down to 30 ppb limit of detection provided by monolayer thick active layers and operates in air with up to 95% relative humidity. By means of principal component analysis, it is able to discriminate toxic air pollutants and monitor meat product freshness. The approach presented paves the way for developing affordable air sensing networks for the Internet of Things.
Highlights
Modern solid-state gas sensors approaching ppb-level limit of detection open new perspectives for process control, environmental monitoring and exhaled breath analysis
We demonstrate the first fully integrated Organic field-effect transistors (OFETs)-based electronic nose, which operates in air with up to 95% relative humidity and has down to 30 ppb limit of detection
The ultrasensitive OFET-based sensor array with 2D nanoscale active layers was realized by Langmuir technique for organic semiconducting (OSC) monolayer deposition and its partial modification with different receptors on a single substrate to induce cross-selectivity
Summary
Modern solid-state gas sensors approaching ppb-level limit of detection open new perspectives for process control, environmental monitoring and exhaled breath analysis. Organic field-effect transistors (OFETs) are especially promising for gas sensing due to their outstanding sensitivities, low cost and small power consumption They suffer of poor selectivity, requiring development of cross-selective arrays to distinguish analytes, and environmental instability, especially in humid air. Detection of toxic gases, such as nitrogen oxides, hydrogen sulfide and ammonia, attracts many research activities due to increasing danger of air pollution related to industrial emissions, bumps and combustion engines[1] These gases are considered as disease markers in exhaled breath and can be used for non-invasive healthcare monitoring[2,3]. The biggest flaws of them are environmental instability and poor selectivity Most of these sensors work only in vacuum, nitrogen or dry air and respond to a wide variety of interfering gases due to nonspecific interactions of the target analyte with the active layer. Its versatility was demonstrated by exceptional capabilities for environmental monitoring in wide humidity range and food freshness control
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