Embodiments in accordance with the present invention relate to techniques
for the growth and attachment of single wall carbon nanotubes (SWNT),
facilitating their use as robust and well-characterized tools for AFM
imaging and other applications. In accordance with one embodiment, SWNTs
attached to an AFM tip can function as a structural scaffold for
nanoscale device fabrication on a scanning probe. Such a probe can
trigger, with nanometer precision, specific biochemical reactions or
conformational changes in biological systems. The consequences of such
triggering can be observed in real time by single-molecule fluorescence,
electrical, and/or AFM sensing. Specific embodiments in accordance with
the present invention utilize sensing and manipulation of individual
molecules with carbon nanotubes, coupled with single-molecule
fluorescence imaging, to allow observation of spectroscopic signals in
response to mechanically induced molecular changes. Biological
macromolecules such as proteins or DNA can be attached to nanotubes to
create highly specific single-molecule probes for investigations of
intermolecular dynamics, for assembling hybrid biological and nanoscale
materials, or for developing molecular electronics. In one example,
electrical wiring of single redox enzymes to carbon nanotube scanning
probes allows observation and electrochemical control over single
enzymatic reactions by monitoring fluorescence from a redox-active
cofactor or the formation of fluorescent products. Enzymes "nanowired" to
the tips of carbon nanotubes in accordance with embodiments of the
present invention, may enable extremely sensitive probing of biological
stimulus-response with high spatial resolution, including product-induced
signal transduction.