Optical and electronic images of a hydrogen nanosensor fabricated by the authors. An array of palladium nanowires is assembled, by means of ac dielectrophoresis, directly onto a silicon chip. Wires grow almost perpendicularly to interdigitated electrodes. The RT response of the devices depends on the size and morphology of the sensitive elements. Electric current changes can be reversible and greater than 140% in 4% H2.
