Organic Field-Effect Transistor-Based Ultrafast, Flexible, Physiological-Temperature Sensors with Hexagonal Barium Titanate Nanocrystals in Amorphous Matrix as Sensing Material

Suman Mandal, Madhuchanda Banerjee, Satyajit Roy, Ajoy Mandal, Arnab Ghosh, Biswarup Satpati, Dipak K. Goswami

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Organic field-effect transistors (OFETs) with hexagonal barium titanate nanocrystals (h-BTNCs) in amorphous matrix as one of the bilayer dielectric systems have been fabricated on a highly flexible 10 μm thick poly(ethylene terephthalate) substrate. The device current and mobility remain constant up to a bending radius of 4 mm, which makes the substrate suitable for wearable e-skin applications. h-BTNC films are found to be highly temperature-sensitive, and the OFETs designed based on this material showed ultraprecision measurement (∼4.3 mK), low power (∼1 μW at 1.2 V operating voltage), and ultrafast response (∼24 ms) in sensing temperature over a range of 20-45 °C continuously. The sensors are highly stable around body temperature and work at various extreme conditions, such as under water and in solutions of different pH values and various salt concentrations. These properties make this sensor unique and highly suitable for various healthcare and other applications, wherein a small variation of temperature around this temperature range is required to be measured at an ultrahigh speed.

Original languageEnglish
Pages (from-to)4193-4202
Number of pages10
JournalACS applied materials & interfaces
Volume11
Issue number4
DOIs
StatePublished - 30 Jan 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
Copyright © 2018 American Chemical Society.

Keywords

  • electronic skin
  • flexible sensors
  • healthcare sensors
  • low-power OFETs
  • organic field-effect transistors
  • temperature sensors

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