Accession Number : ADD018021

Title :   Method of Electrochemical Detection/Identification of Single Organic Molecules Using Scanning Tunneling Microscopy.

Descriptive Note : Patent, Filed 27 Jan 94, patented 5 Mar 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Tao, Nongjian ; Lindsay, Stuart M

Report Date : 05 Mar 1996

Pagination or Media Count : 11

Abstract : A method of detecting/identifying organic molecules which have been mixed with an appropriate electrolyte to form an electrolytic solution is disclosed. The organic molecules to be detected/identified 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 detection/identification 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 detect/identify organic molecules is extended to a single molecule by the combination of electrochemical and scanning tunneling microscopy techniques, according to the present invention.

Descriptors :   *SCANNING ELECTRON MICROSCOPES, *DETECTION, *MOLECULES, *TUNNELING(ELECTRONICS), *ELECTROCHEMISTRY, *IDENTIFICATION, *ORGANIC COMPOUNDS, *PATENTS, CONDUCTIVITY, SOLUTIONS(MIXTURES), ADSORPTION, ELECTRONIC SCANNERS, VOLTAGE, SUBSTRATES, ELECTRON MICROSCOPY, IMAGES, ELECTROLYTES, ELECTROLYSIS, PHOTOMICROGRAPHY

Subject Categories : Organic Chemistry
      Physical Chemistry
      Electrical and Electronic Equipment
      Atomic and Molecular Physics and Spectroscopy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE