Current-voltage-temperature characteristics of DNA origami.
The temperature dependences of the current-voltage characteristics of a sample of triangular DNA origami deposited in a 100 nm gap between platinum electrodes are measured using a probe station. Below 240 K, the sample shows high impedance, similar to that of the substrate. Near room temperature the current shows exponential behavior with respect to the inverse of temperature. Sweep times of 1 s do not yield a steady state; however sweep times of 450 s for the bias voltage secure a steady state. The thermionic emission and hopping conduction models yield similar barriers of approximately 0.7 eV at low voltages. For high voltages, the hopping conduction mechanism yields a barrier of 0.9 eV and the thermionic emission yields 1.1 eV. The experimental data set suggests that the dominant conduction mechanism is hopping in the range 280-320 K. The results are consistent with theoretical and experimental estimates of the barrier for related molecules.
Bellido
Edson P
EP
Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
Bobadilla
Alfredo D
AD
Rangel
Norma L
NL
Zhong
Hong
H
Norton
Michael L
ML
Sinitskii
Alexander
A
Seminario
Jorge M
JM