Chemistry: electrical and wave energy – Processes and products
Patent
1982-01-12
1983-10-25
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204406, 204411, 204412, 204416, 204431, 324 715, 357 25, G01N 2746
Patent
active
044117418
ABSTRACT:
An apparatus and method for measuring the concentration of various components in a fluid sample. The apparatus comprises a chemically sensitive field effect transistor (CHEMFET) having a semiconductor substrate and a pair of diffusion regions formed at the surface of the substrate. An electrical insulating layer is positioned adjacent the substrate and a fluid pervious bridge member is mounted to the insulating layer so as to form a gap between the bridge member and insulating layer. The apparatus also includes means for imposing an electrical charge on the bridge member, means for imposing an electrical potential between the diffusion regions, and means for detecting current flow between the diffusion regions. The fluid sample to be analyzed is introduced through the fluid pervious bridge member and into the gap where various components of the fluid sample are adsorbed by the bridge member, and in another embodiment, also by an adsorptive layer which is applied within the gap. The adsorptive layer can be specifically chosen so as to render the apparatus chemically selective of one or more fluid components.
REFERENCES:
patent: 3719564 (1973-03-01), Lilly, Jr. et al.
patent: 4020830 (1977-05-01), Johnson et al.
I. Lundstrom et al., "A Hydrogen-Sensitive MOS Field-Effect Transistor," 26 Applied Physics Letters, 55-57 (Jan. 15, 1975).
J. H. Griffiths et al., "Applications of the Surface-Potential Detector," The Chromatography of Gases and Vapours, Part IV, 3446-3453 (1954).
G. Phillips, "An Electronic Method of Detecting Impurities in the Air," 28 J. Sci. Inst. 342-347 (1951).
Hulse Dale E.
Jensen Allen R.
Kaplan G. L.
University of Utah
Workman H. Ross
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