Nanotubes electron transport

Bockrath M, Cobden D H, McEuen P L, Chopra N G, Zettl A, Thess A and Smalley R E 1997 Single-electron transport in ropes of nanotubes Science 275 1922-5. 

S.B. Cronin, R. Barnett, M. Tinkham, S.G. Chou, O. Rabin, M.S. Dresselhaus, A.K. Swan, M.S. Unlu, and B.B. Goldberg, Electrochemical gating of individual single-wall carbon nanotubes observed by electron transport measurements and resonant Raman spectroscopy. Appl. Phys. Lett. 84, 2052—2054 (2004). 

Finally, an interesting concept, recently advanced, is the implementation of active materials as nanotube arrays. These systems have high surface area to optimize contact between semiconductor and electrolyte, and good light trapping properties. Their inner space could also be filled with catalysts or sensitizers and/ or pn junctions to obtain charge separation and facilitate electron transport [136]. 

Fournet P, Coleman JN, Lahr B, Drury A, Blau WJ, O Brien DF, Horhold HH (2001). Enhanced brightness in organic light-emitting diodes using a carbon nanotube composite as an electron-transport layer. J. Appl. Phys. 90 969-975. 

V. Meunier, M. Terrones, Electronic transport and mechanical properties of phorous and phosphorus-nitrogen doped carbon nanotubes, ACS Nano, vol. 3, pp. 19131-1921, 2009. 

Fig. 17.6 (a) Overview of processes and typical time constants under working conditions (1 sun) in a Ru-dye-sensitized solar cell with iodide/triiodide electrolyte. Recombination processes are indicated by red arrows. Reprinted with permission from [30]. Copyright 2010, American Chemical Society. Electron transport across nanostructured semiconductor films (b) in the absence and (c) in the presence of a nanotube support architecture. Reprinted with permission from [38]. Copyright 2007, American Chemical Society. 

We note the unique, highly ordered titania nanotube array structure enables the conductive electrolyte, in this work IM KOH, to permeate the entire internal and external surfaces, hence there is a constant electrostatic potential along the length of the tubes (no RC ladder effect). Therefore long-range electron transport is dominated... 

Generally, a carbon nanotube FET device is constructed by a substrate (gate), two microelectrodes (source and drain), and bridging material between the electrodes, which is typically an individual SWNT or a SWNT network. A SWNT FET is usually fabricated by casting a dispersion of bulk SWNTs or directly growing nanotubes on the substrate by chemical vapor deposition (C VD) either before or after the electrodes are patterned.64 Due to the diffusive electron transport properties of semiconducting SWNTs, the current flow in SWNT FET is extremely sensitive to the substance adsorption or other related events on which the sensing is based. 

M. Bockrath, D.H. Cobden, P.L. McEuen, N.C. Chopra, A. Zettl, A. Thess, R.E. Smalley, Single-Electron Transport in Ropes of Carbon Nanotubes , Science, 275, 1922 (1997)... 

Interest in carbon nanotubes has grown at a very rapid rate because of their many exceptional properties, which span the spectrum from mechanical and chemical robustness to novel electronic transport properties. The field is reviewed and several of the important directions, including their chemical structure, electronic structure, transport properties, electronic, elastic and field emission properties are summarized. 

A different set of carbon arc growth conditions is also found to produce very thin nanotubes.[Ii93, Be93] Those groups found that the presence of Fe or Co somehow catalyzed the formation of single-shelled nanotubes. Such samples may be especially useful for comparison to theories of electronic transport and mechanical properties. 

Bachtold, A. et al.. Scanned probe microscopy of electronic transport in carbon nanotubes, Phys. Rev. Lett. 84, 6082-6085, 2000. 

To avoid the account of the edge effects let us consider rather long structures (L > 50 nm), i.e. we will consider the armchair single-wall carbon nanotubes with the length greater than electron mean free path [2-6]. To describe the electron-phonon transport in nanotubes like that the semiclassical approach and the kinetic Boltzmann equation for one-dimensional electron-phonon gas can be used [4,6]. In this connection the purpose of the present study is to develop a model of electron transport based on a numerical solution of the Boltzmann transport equation. 

---