Document Type

Patent

Publication Date

8-13-2002

Abstract

An acoustic wave based-chemical sensor utilizing a crystal substrate and a coating of at least two blended materials is disclosed. The blended materials comprise a combination of (a) a high glass transition temperature polymer or a material of high melting point, and (b) a low glass transition temperature polymer or a material having a low melting point. Transducers are connected to the crystal substrate to generate an alternating potential across the crystal substrate, which in turn causes the crystal to resonate due to the converse piezoelectric effect. The blended coating absorbs the analyte, thus changing the mass of the chemical sensor, and accordingly changing its resonant frequency. The transducers detect this change in resonant frequency to indicate that the analyte is present. The use of blended materials results in a thicker coating combining the preferred properties of the blend constituents, such as improved detection sensitivities, faster response times, less acoustic wave damping, and higher operational temperature ranges.

Patent Number

US 6,432,362 B1

ISURF Reference Number

2562

Assignee

Iowa State University Research Foundation, Inc.,

Application Number

US 09/413,401

Date Filed

10-6-1999

Language

en

File Format

application/pdf

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