Sensitivity control for nanotube sensors

A nanostructure sensing device for detecting at least one analyte, comprising:

• a substrate;
• a first nanostructure disposed over the substrate;
• a first conductive element disposed over the substrate and forming an electrical junction with the first nanostructure;
• a second conductive element disposed over the substrate and forming an electrical junction with the first nanostructure;
• a first metal node in contact with the first nanostructure;
• and
• contact regions adjacent to junctions of the conductive elements and the first nanostructure and adjacent to contacts between the first metal node and the first nanostructure.

An electronic nanostructure device, comprising:

• a substrate;
• a first nanostructure disposed over the substrate;
• a first conductive element disposed over the substrate and forming a first electrical junction with a first nanostructure;
• a second conductive element disposed over the substrate and forming a second electrical junction with the first nanostructure;
• contact regions adjacent to junctions of the conductive elements and the first nanostructure;
• passivation material on the contact regions;
• and
• a portion of the first nanostructure substantially free of passivation material.