Wood is good for a lot of things.
Engquist built on this experience by attempting to optimize the removal of lignin to create a more efficient channel for the polymer to operate within, before analyzing the conductive properties of the balsa-polymer unit.
By stacking millimeter-thick units that operated as electrodes and channels, the team found they could create a rather crude transistor. With no voltage, the entire structure can be considered open and the switch set in the 'on' position. Pump in 6 volts, and the channel fills with electrons, slowly squeezing the channel shut and flicking the switch into the 'off' position.
Rapid computations aside, biodegradable electronics made from easily harvested resources could be used in remote sensors that need to break down easily or inconspicuous devices powered by movements in the environment.
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