John Rogers, "Stretchy Electronics That Can Dissolve in Your Body"

Oct 11, 2014 01:26 PM  similar to  SNI talk.

Rogers is at UIUC.

bio-integr electronics  and transient electronics.

smaller, faster, cheaper is what we want.

we work on bio-integrated:

circuits are built on rigid wafers  (always true)

how to wrap brain or heart with it or skin with computer.

how throw out the wafer.  mat. sci challenges.

eg brain:  shows abt 4 inch wafer... but how to integrate.

current is Utah array.

modulus  150 gigapascal  (silicon CMOS wafer);

brain 5 kilopascal modulus.

use air hammer to put Utah array into brain.

over time:  hard shard of glass in jello;  continued mech irritation.

Utah Array... a  work horse... but can do better;

want soft, shape conformal, and biocompatible;

semiconductor:  organic vs inorg and field effect mobility

E Ink:  polymers....   carbon NTs  prob best... but immature;

(graphene may be irrelevant)

but can u do it with Silicon...  repurpose it... prob quickest path.

rigid, brittle... drop it it breaks....   bending stiffness (depends on youngs mod)

but go to 10 nm thickness...   thin silicon is floppy;

v flexible;  thin silicon  ....  good but fragile;

do heterogenous integr   but combine with silicone (rubber like)

print it onto a plastic substrate....    floppy, flexible and sticky.

shows  GaAs membranes printed onto plastic  1600 of them  100% yield.

now build it onto plastic or rubber... but cannot adapt to brain...

but need something that can be stretched like a rubber band...

print electronics onto pre-strechted surface then let it shrink... like accordion bellows.

shows 3 stage ring oscillator;  in wavy geometry;  they work;

use it to wrap skin or heart....(3d form when relaxed)

ECoG;  SOTA:

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