Liquid transistors

TITLE: Liquid Transistors

Advisors: Sameer R Sonkusale

Researchers: Shideh Kabiri Ameri

ABSTRACT:

Innovations in transistor technologies are so far driven by the need of the computing and consumer electronics market for higher speed, lower power and higher levels of integration. However such devices are ill-suited for long-term interfaces with biological cells/tissues since they are rigid, planar devices that are often biologically incompatible. There is a need for flexible stretchable transistors that can reliably interface with biology. Applications range from chronic neural implants to bio-hybrid cardiac pacemaker or artificial pancreas.

APPROACH:

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We have created a unique three dimensional transistor from graphene and used liquid-gating for controlling the transistor operation. Use of graphene makes it biocompatible, and also offers flexibility. Moreover use of liquid gating provides all-around electrostatic control which is ideally suited for wet biological environment. Graphene comes in the form of a foam made single or double layer and also exhibit interesting chemical and strain sensing properties.


Results:

The transistor was made from graphene foam with ionic-liquid serving as the gate. Transistor showed exemplary ambipolar behavior with a much higher current carrying capacity than even regular 2D graphene transistors (published in CARBON 2014). We have new results with ion-gel dielectric on flexible PDMS for a stretchable three dimensional foam transistor planned for publication.

 

Publications:

Please see the publication page.