Electronic Design

Micronail Chip Links Electronics With Bio Cells

IMEC (www.imec.com), a nanotechnology research center based in Leuven, Belgium, has developed a unique microchip with microscopic nail structures that enables close communication between electronics and biological cells. The new chip is a mass-producible, easy-to-use tool for electrophysiology research, for example for fundamental research on the functioning and dysfunctioning of the brain. Each micronail structure serves as a close contact-point for one cell, and contains an electrode that can very accurately record and trigger in real-time the electrical activity of an individual electrogenic cell in a network.

IMEC’s micronail chip (see photo) can be used to study the communication mechanisms between cells, such as cardiomyocytes (heart cells) or neurons (brain cells). The electrodes in the chip are the size of cells and even smaller. They consist of tiny nail structures made of a metal stem covered with an oxide layer, and a conductive (e.g. gold or titanium nitride) tip. When cells are applied on the chip surface, the cell membranes naturally engulf the nail structures, thereby creating a strong contact with the electrode. This close contact improves signal-to-noise ratio, enabling precise recording of electrical signals and electrical stimulation of single cells.

“We tackled several challenges to realize this micronail chip such as keeping the cells alive on the chip surface; combining the wet cell solution with the electronics underneath without destroying the electronics; guiding the cell growth so that the cell body is just on top of one individual electrode; and last but not least: bring the cells as close as possible to the chip surface. Now we have a unique instrument to record and interpret the signals of the neurons. We can also stimulate neurons and follow up the consequences to unravel the functioning of our brain,” said Wolfgang Eberle, Group manager Bioelectronic systems at IMEC.

Kris Verstreken, Director Bio-Nanoelectronics added, “Little is known about the functioning of our brain. Where do emotions origin? How do we build up memories? Or what is the cause of brain diseases such as Parkinson’s disease or Alzheimer’s disease? Many processes in our brain are unknown. Neurons are very plastic cells, continuously forming new connections and breaking up or rebuilding new ones. But how do they do that? And which are the consequences for learning and development? On the long term, we can use the knowledge that we build up with in vitro experiments on our micronail chip to diagnose diseases, or even develop therapies, by stimulating cells, or building new communication bridges between cells after a brain infarct.”

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