Fiber-based organic electrochemical transistor

Abstract

An organic electrochemical transistor (OECT) that may be used as a biosensor is built up by layers applied to a monofilament. A first conducting layer applied to the monofilament includes generally cylindrical source and drain contacts with a gap therebetween. An electro-active layer of an organic material altering its electrical conductivity through a change in redox state is in electrical contact with the source and drain contacts, and has a transistor channel interface for contacting an electrolyte. A gate electrode is spaced apart from the first monofilament, and may comprise a cylindrical layer built up on another length of monofilament.

Description

technical field [0001] The present invention relates to electrochemical devices, and in particular, but not exclusively, to electrochemical transistor devices based on conductive organic materials. Background technique [0002] Transistors are important building blocks of electronic devices and have been widely used in the development of various sensors including electrical and chemical sensors. Among the different types of transistor-based sensors, electrochemical transistors (ECTs) have been favored due to their simple and inexpensive fabrication, mechanical flexibility, and suitability for miniaturization relative to conventional transistors such as field-effect transistors (FETs), received special attention. Organic materials such as conducting polymers have been used to develop organic electrochemical transistors (OECTs), which facilitates the application of OECTs in the fields of biological and chemical sensing. [0003] In contrast to field-effect transistors (FETs)...

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Problems solved by technology

These planar OECTs have practical disadvantages due to their relatively poor flexibility and bulkiness, which prevents their use in applications where flexibility and small-scale manipulation are necessary.

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