CMI News

McEuen group reports studies of individual suspended carbon nanotubes.

March 12th, 2009  -  

The McEuen group published a manuscript in Nano Letters describing the characterization of suspended carbon nanotubes. They used optical trapping techniques and scanning photocurrent microscopy to investigate the motion of suspended single-walled carbon nanotubes in solution. The movement of nanotubes was studied by monitoring their photocurrent images and measuring their thermal fluctuations by imaging microbeads attached to nanotubes by single-stranded DNA.

By analyzing their thermal fluctuations, the McEuen group was able to obtain the torsional and bending stiffness of nanotubes and then calculate their diameters and measure, with subangstrom resolution, the effective attachment point of the microbead to the nanotube.