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Composite substrate, intended for an apparatus for quantitative detection of a component present in a gas or liquid

  • US 4,860,573 A
  • Filed: 07/17/1987
  • Issued: 08/29/1989
  • Est. Priority Date: 10/03/1985
  • Status: Expired due to Fees
First Claim
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1. A composite substrate for use in an apparatus for the quantitative detection of a substance present in a gas or liquid of the type having transducer means for inducing elastic vibrations in a surface layer of the substrate and detector means for sensing changes in the elastic vibrations resulting from bonding of the substance to be detected with the surface layer, the improvement wherein the surface layer (D'"'"') of said substrate (D) comprises a first substance having first active sites (A) adapted for covalent chemical bonding and molecules (X) of a second substance, said molecules (X) having at least one first active site forming a covalent bond with a respective active site (A) of said substrate (D'"'"'), and having at least one second active site (B) different from said first site, said second active sites (B) of said molecules (X) being adapted for selectively and reversibly making a coordinative bond with molecules (G) of the substance to be detected.

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