An inter-segment tunneling nanoscale force sensor: Modeling and simulation

A segmented high aspect ratio nanowire employing the tunneling effect is proposed to theoretically realize non-linear effects in nanoscale force sensing. The structure consists of an external insulating shell with metallic core regions separated at the structure´s geometric center. The separation is considered to be in the order of a few Å for the tunneling effect to be pronounced. As the structure is subjected to an axial force at the ends, buckling occurs causing a change in the separation which results in a non-linear change in the current. Force-separation and current-force relations are studied and the high sensitivity of the structure as a force sensor is established.