Field Emission from Single- Double- and Multi-Walled
Carbon Nanotubes Chemically Attached to Silicon
Cameron. J Shearer,1,3 Adam. Fahy,2 Matthew. G. Barr,2 Katherine. E Moore,1 Paul. C Dastoor,2 and
Joseph. G. Shapter1,3
1
Centre for Nanoscale Science and Technology, School of Chemical and Physical Sciences, Flinders
University, Adelaide, South Australia 5042
2
Centre for Organic Electronics, School of Physics, University of Newcastle, Callaghan, New South
Wales 2308
3
E-mail: Cameron.Shearer@flinders.edu.au or Joe.Shapter@flinders.edu.au
Supplementary information:
Figure A1 shows a Raman spectrum of the pristine DWCNT dropped onto a mica surface. The Raman
spectra in Figure A1 shows one major difference to that of the SWCNTs and the Si-DWCNT surface.
The RBM band (100 – 350 cm-1, inset) consists of 5 discernable peaks. Each peak is due to a distinct
diameter of CNT within the DWCNT powder as shown in Table A1. The multiple peaks observed
indicate that DWCNTs of different inner and outer wall diameter are present within the sample. Not all
the possible diameters are shown because not all the CNT diameters are excited by the 532 nm laser
used. Additionally any RBM peaks below 150 cm-1 are cut out by the filter in the spectrometer such that
it is not possible to detect CNTs with a diameter greater than 1.8 nm.
1
FIG. A1. Raman spectrum of DWCNTs powder with zoom of RBM region (inset).
Table A1: Major RBM peak positions and corresponding calculated diameter for DWCNTs.
Peak Position
Diameter
(cm-1)
(nm)
167
1.57
207
1.23
261
0.94
301
0.81
315
0.77
2