Bacteria Inside Semiconductors as Potential Sensor Elements: Biochip Progress

It was discovered at the beginning of this Century that living bacteriaand specifically the extremophile Pseudomonas syzgiicould be captured inside growing crystals of pure water-corroding semiconductorsspecifically germaniumand thereby initiated pursuit of truly functional biochip-based biosensors. This observation was first made at the inside ultraviolet-illuminated walls of ultrapure water-flowing semiconductor fabrication facilities (fabs) and has since been, not as perfectly, replicated in simpler flow cell systems for chip manufacture, described here. Recognizing the potential importance of these adducts as optical switches, for example, or probes of metabolic events, the influences of the fabs and their components on the crystal nucleation and growth phenomena now identified are reviewed and discussed with regard to further research needs. For example, optical beams of current photonic circuits can be more easily modulated by integral embedded cells into electrical signals on semiconductors. Such research responds to a recently published Grand Challenge in ceramic science, designing and synthesizing oxide electronics, surfaces, interfaces and nanoscale structures that can be tuned by biological stimuli, to reveal phenomena not otherwise possible with conventional semiconductor electronics. This short review addresses only the fabrication facilities features at the time of first production of these potential biochips.

Sah, Vasu, Robert Baier






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