A combination of low limit of detection, low power consumption, and portability makes OFETs chemical sensors promising for various applications in the areas of industrial safety control, food spoilage detection, and medical diagnostics.
Our sensors are able to operate in air and allow an ultrafast detection of different analytes at low concentrations down to tens of parts per billion. The sensors are reusable and can be utilized in real-time air-quality monitoring systems. We show that a direct current response of the LS OFET can be split into the alteration of various transistor parameters, responsible for the interactions with different toxic gases.
1. Sensor fabrication
  • Based on the BTBT derivatives
  • Self assembled semiconducting monolayer
To induce selectivity to target gases we are covering our sensors with receptor layers based on metalloporphyrins with different metal atoms.
2. Working principal
  • Gas physisorption
  • Charge trapping
Absorption of polar molecules on the surface changes local field distribution and trap charges, thus can be registered by changes in the transistor current.
3. Recovery
After sensing the devices recovers to the initial state relatively fast.
The sensors are able to operate at room temperature in air with relative humidity up to 100%.


NH3 and H2S real-time detection in the humid air by two-layer Langmuir-Schaefer OFETs‍ 

A.A. Trul, V.P. Chekusova, O.V. Borshchev, E.V. Agina, S.A. Ponomarenko 

Sensors and Actuators B: Chemical, 2020 doi:10.1016/j.snb.2020.128609 

Highly Sensitive Air-Stable Easily Processable Gas Sensors Based on Langmuir–Schaefer Monolayer Organic Field-Effect Transistors for Multiparametric H2S and NH3 Real-Time Detection‍ 

A.S. Sizov, A.A. Trul, V.P. Chekusova, O.V. Borshchev, A.A. Vasiliev, E.V. Agina, S.A. Ponomarenko 

ACS Appl. Mater. Interfaces, 2018, 10 (50), 43831–43841; doi:10.1021/acsami.8b15427‍ 

Organosilicon dimer of BTBT as a perspective semiconductor material for toxic gas detection with monolayer organic field-effect transistors 

‍A.A. Trul, A.S. Sizov, V.P. Chekusova, O.V. Borshchev, E.V. Agina, M.A. Shcherbina, A.V. Bakirov, S.N. Chvalun, S.A. Ponomarenko 

Journal of Materials Chemistry C, 2018, 6, 9649-9659; doi:10.1039/C8TC02447B‍ 

Synthesis of organosilicon derivatives of [1]benzothieno[3,2-b][1]-benzothiophene for efficient monolayer Langmuir–Blodgett organic field effect transistors‍ 

O.V. Borshchev, A.S. Sizov, E.V. Agina, A.A. Bessonov and S.A. Ponomarenko 

Chem. Commun., 2017, 53, 885-888; doi:10.1039/C6CC08654C 

Direct-write printing of reactive oligomeric alkoxysilanes as an affordable and highly efficient route for promoting local adhesion of silver inks on polymer substrates‍ 

M.N. Kirikova, E.V. Agina, A.A. Bessonov, A.S. Sizov, O.V. Borshchev, A.A. Trul, A.M. Muzafarov, S.A. Ponomarenko 

Journal of Materials Chemistry C, 2016, 4, 2211-2218; doi:10.1039/C5TC03497C

Thiophene-based monolayer OFETs prepared by Langmuir techniques‍ 

E.V. Agina, A.S. Sizov, D.S. Anisimov, A.A. Trul, O.V. Borshchev, D.Y. Paraschuk, M.A. Shcherbina, S.N. Chvalun, S.A. Ponomarenko 

Proceedings of SPIE, 2015, Vol. 9568, 95680Z; doi:10.1117/12.2188338

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