Label-free SnO nanowire FET biosensor for protein detection.

Novel tin oxide field-effect-transistors (SnO NW-FET) for pH and protein detection applicable in the healthcare sector are reported. With a SnO NW-FET the proof-of-concept of a bio-sensing device is demonstrated using the carrier transport control of the FET channel by a (bio-) liquid modulated gate. Ultra-thin AlO fabricated by a low temperature atomic layer deposition (ALD) process represents a sensitive layer to H ions safeguarding the nanowire at the same time.