Suspended single-electron transistors: fabrication and measurement
  We have fabricated aluminum single-electron transistors in which the island is not in contact with the substrate. This new type of device, which can be called suspended single-electron transistor (SUSET), displayed well-defined I-V and dI/dV-V features typical for high-quality standard SET's. 
G. S. Paraoanu and A. M. Halvari