Journal
ACS NANO
Volume 3, Issue 2, Pages 351-356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn800798a
Keywords
molecular machines; nanocars; single molecule fluorescence spectroscopy; single molecule dynamics on surfaces; polarization spectroscopy
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Funding
- NSF NIRT [ECCS-0708765]
- NSF Penn State MRSEC
- Robert A. Welch Foundation [C-1664, C-1489]
- 3M for Nontenured Faculty Grant
- Energy and Environmental Systems Institute (EESI) at Rice University
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [820404] Funding Source: National Science Foundation
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Nanomachines designed to exhibit controlled mechanical motions on the molecular scale present new possibilities of building novel functional materials. Single molecule fluorescence imaging of dye-labeled nanocars on a glass surface at room temperature showed a coupled translational and rotational motion of these nanoscale machines with an activation energy of 42 +/- 5 kJ/mol. The 3 nm-long dye-labeled carborane-wheeled nanocars moved by as much as 2.5 mu m with an average speed of 4.1 nm/s. Translation of the nanocars due a wheel-like rolling mechanism is proposed and this is consistent with the absence of movement for a three-wheeled nanocar analogue and the stationary behavior of unbound dye molecules. These findings are an important first step toward the rational design and ultimate control of surface-operational molecular machines.
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