Method of Electrochemical Detection/Identification of Single Organic Molecules Using Scanning Tunneling Microscopy.
Patent, Filed 27 Jan 94, patented 5 Mar 96,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A method of detectingidentifying organic molecules which have been mixed with an appropriate electrolyte to form an electrolytic solution is disclosed. The organic molecules to be detectedidentified are adsorbed onto the surface of a conducting substrate, which is adjusted to an overall positive voltage potential within a range of E sub LOW and E sub HIGH. The voltage potential on the surface of the conducting substrate, and, accordingly, the adsorbed organic molecules, is adjusted until an electrochemically-induced change occurs The voltage potential at which the change occurs is characteristic of the organic molecule, thus permitting detectionidentification thereof. Because the contrast of photomicrographic images generated concurrently by an associated scanning tunneling microscope is remarkably sensitive to the changes in the foregoing voltage potentials, the electrochemical ability to detectidentify organic molecules is extended to a single molecule by the combination of electrochemical and scanning tunneling microscopy techniques, according to the present invention.
- Organic Chemistry
- Physical Chemistry
- Electrical and Electronic Equipment
- Atomic and Molecular Physics and Spectroscopy