Functional molecular systems with resettable transport properties based on organic molecules and one-dimensional conductors

 

 

 

 

We’ll suggest a comprehensive model to describe the interaction between the molecular chains and carbon nanotubes in creating quasi-one-dimentional conductive structures with resettable transport properties. We’ll formulate technological principles of molecular arrays for memory devices based on cross-bar structures of nanotube electrodes connected by molecular providing switchable transport properties. This will be the base for the development of sensor devices of electrostatic type and organic conducting electronic systems with the effect of the memory (memristor).

 

Nanotube - single molecular interaction can be used not only for sensor application but for new single molecular device formation. And nanotube play a role of connective electrodes for single molecular channel. We observed the formation of PANI EB conductive channel in the gap between high aspect ratio carbon electrodes. The conductance increase up to 6 orders of magnitude compared to initial film of pure PANI EB. Tight binding between CNT and PANI initiates the electron delocalization and leads to conductance increasing for polymer chains in CNT-PANI composites. PANI-NT transistor demonstrates ambipolar properties at high gate voltages. The conductance can be varied up to four orders of magnitude.

It was shown that electric field induces one-dimensional semiconducting molecular channel assembling. This molecular channel demonstrate strong dependence on external (gate) electric field. The change of conductivity is no less then four orders of magnitude when gate potential changes on 5 Volts. The measured conductivity at zero gate potential was obtained 3,2 Sm/сm and is less then doped PANI. But if note the contribution in resistance of CNT-gold electrode contact is about 1 MOhm we can conclude that intrinsic conductivity of molecular channel between CNT can be an order higher.

Mobility estimation in the channel in mentioned conditions gives the value 1.16 cm2/V∙s, which significantly exceeds mobility in unstructured macroscopic polymer material, and which is in agreement with the value of mobility in undoped PANI nanofiber

 

 

 

 

Main publications

  1. I.I. Bobrinetskiy, A. V. Emelianov, V. K. Nevolin, A. V. Romashkin. Effect of an Organic Molecular Coating on Control Over the Conductance of Carbon Nanotube Channel // Semiconductors, 2014, Vol. 48, No. 13, pp. 1735–1741
  2. I.V. Fedorov, I.I.Bobrinetskiy, B.I. Shapiro, A.V. Romashkin, V.K. Nevolin. Photoelectric response of thiamonomethinecyanine J-aggregate nanoribbons deposited via dielectrophoresis technique // Physics Letters A, 2014, V. 378, Iss. 3, P. 226-228.
  3. Bobrinetskii I.I., Nevolin V.K., Romashkin A.V. Quasi One Dimensional Molecular Transistors Based on Polyaniline and Carbon Nanotubes as Electrodes // Semiconductors, 2012, Vol. 46, No. 13, pp. 1593-1597.
  4. Bobrinetskii I.I., Nevolin V.K., S. V. Khartov, Chaplygin Yu.A. Field-modulated conductivity in quasi-one-dimensional molecular conductors// Technical Physics Letters, 2005, Vol. 31, No.10. P. 885-887.

 

 

 

 

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