The relationship between network morphology and conductivity in nanotube films

被引：126

作者：

Lyons, Philip E. ^{[1
,2
]}

De, Sukanta ^{[1
,2
]}

Blighe, Fiona ^{[1
]}

Nicolosi, Valeria ^{[1
]}

Pereira, Luiz Felipe C. ^{[1
]}

Ferreira, Mauro S. ^{[1
]}

Coleman, Jonathan N. ^{[1
,2
]}

机构：

[1] Univ Dublin Trinity Coll, Sch Phys, Dublin 2, Ireland

[2] Univ Dublin Trinity Coll, CRANN, Dublin 2, Ireland

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 104卷 / 04期

基金：

爱尔兰科学基金会;

关键词：

D O I：

10.1063/1.2968437

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have characterized both the direct current conductivity and morphology of a wide range of films made from bundled nanotubes, produced by a selection of commercial suppliers. The conductivity increases with increasing nanotube graphitization but decreases with increasing film porosity P and mean bundle diameter (D). Computational studies show that the network conductivity is expected to scale linearly with the number density of interbundle junctions. A simple expression is derived to relate the junction number density to the porosity and mean bundle diameter. Plotting the experimental network conductivities versus the junction number density calculated from porosity and bundle diameter shows an approximate linear relationship. Such a linear relationship implies that the conductivity scales quadratically with the nanotube volume fraction, reminiscent of percolation theory. More importantly it shows the conductivity to scale with < D >(-3). Well-defined scaling with diameter and porosity allows the calculation of a specific conductivity expected for films with porosity of 50% and mean bundle diameter of 2 rim. This predicted specific conductivity scales well with the level of nanotube graphitization, reaching values as high as 1.5 X 10(7) S/m for well graphitized HiPCO single walled nanotubes. (C) 2008 American Institute of Physics.

引用

页数：8

共 29 条

[1] Carbon nanotube sheets as electrodes in organic light-emitting diodes [J].

Aguirre, CM ;

Auvray, S ;

Pigeon, S ;

Izquierdo, R ;

Desjardins, P ;

Martel, R .

APPLIED PHYSICS LETTERS, 2006, 88 (18)

[2] Transparent and flexible carbon nanotube transistors [J].

Artukovic, E ;

Kaempgen, M ;

Hecht, DS ;

Roth, S ;

GrUner, G .

NANO LETTERS, 2005, 5 (04) :757-760

[3] Exfoliation in ecstasy:: liquid crystal formation and concentration-dependent debundling observed for single-wall nanotubes dispersed in the liquid drug γ-butyrolactone [J].

Bergin, Shane D. ;

Nicolosi, Valeria ;

Giordani, Silvia ;

de Gromard, Antoine ;

Carpenter, Leslie ;

Blau, Werner J. ;

Coleman, Jonathan N. .

NANOTECHNOLOGY, 2007, 18 (45)

[4] On the factors controlling the mechanical properties of nanotube films [J].

Blighe, Fiona M. ;

Lyons, Philip E. ;

De, Sukanta ;

Blau, Werner J. ;

Coleman, Jonathan N. .

CARBON, 2008, 46 (01) :41-47

[5] Observation of percolation-like scaling - Far from the percolation threshold - In high volume fraction, high conductivity polymer-nanotube composite films [J].

Blighe, Fiona M. ;

Hernandez, Yenny R. ;

Blau, Werner J. ;

Coleman, Jonathan N. .

ADVANCED MATERIALS, 2007, 19 (24) :4443-+

[6] A VOLUME PROBLEM [J].

BOERSMA, J ;

DEDOELDER, PJ ;

JANSEN, JKM .

SIAM REVIEW, 1983, 25 (01) :102-106

[7] Transparent flexible organic thin-film transistors that use printed single-walled carbon nanotube electrodes [J].

Cao, Q ;

Zhu, ZT ;

Lemaitre, MG ;

Xia, MG ;

Shim, M ;

Rogers, JA .

APPLIED PHYSICS LETTERS, 2006, 88 (11)

[8] Probing electrical transport in nanomaterials: Conductivity of individual carbon nanotubes [J].

Dai, HJ ;

Wong, EW ;

Lieber, CM .

SCIENCE, 1996, 272 (5261) :523-526

[9]

Dressel M., 2002, Electrodynamics of Solids: Optical Properties of Electrons in Matter

[10] Modification of transparent and conducting single wall carbon nanotube thin films via bromine functionalization [J].

Fanchini, Giovanni ;

Unalan, Husnu Emrah ;

Chhowalla, Manish .

APPLIED PHYSICS LETTERS, 2007, 90 (09)

← 1 2 3 →