Low-Voltage, Dual-Gate Organic Transistors with High Sensitivity and Stability toward Electrostatic Biosensing

Mark Nikolka, Dimitrios Simatos, Amir Foudeh, Raphael Pfattner, Iain Mcculloch, Zhenan Bao

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


High levels of performance and stability have been demonstrated for conjugated polymer thin-film transistors in recent years, making them promising materials for flexible electronic circuits and displays. For sensing applications, however, most research efforts have been focusing on electrochemical sensing devices. Here we demonstrate a highly stable biosensing platform using polymer transistors based on the dual-gate mechanism. In this architecture a sensing signal is transduced and amplified by the capacitive coupling between a low-k bottom dielectric and a high-k ionic elastomer top dielectric that is in contact with an analyte solution. The new design exhibits a high signal amplification, high stability under bias stress in various aqueous environments, and low signal drift. Our platform, furthermore, while responding expectedly to charged analytes such as the protein bovine serum albumin, is insensitive to changes of salt concentration of the analyte solution. These features make this platform a potentially suitable tool for a variety of biosensing applications.

Original languageEnglish (US)
Pages (from-to)40581-40589
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number36
StatePublished - Sep 9 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science


  • bioelectronics
  • field-effect transistors
  • ionic dielectric
  • low voltage
  • organic electronics
  • polymer devices
  • sensing


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