Sensor and method for detecting predetermined chemical species in solution

  • US 5,705,399 A
  • Filed: 05/20/1994
  • Issued: 01/06/1998
  • Est. Priority Date: 05/20/1994
  • Status: Expired due to Fees
First Claim
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1. A quartz crystal microbalance chemical sensor comprising:

  • (a) a crystal detector oscillator having a resonant frequency and capable of providing a measurement signal based upon the resonant frequency of the detector oscillator, the crystal detector oscillator having a first crystal side for directly contacting a solution, and a second crystal side isolated from contacting the solution;

    (b) a first electrode integral to the first crystal side, the first electrode having an inner and outer perimeter defining an outer portion of the first crystal side which is exterior to the outer perimeter of the first electrode and an inner portion of the first crystal side which is interior to the inner perimeter of the first electrode; and

    (c) a second electrode integral to the second crystal side.

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