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In this paper a nanofiber (NF) thin film is proposed as a new sensing interface for chemical and biochemical sensor applications. NFs made of Poly-Lactic Acid-Co-Glycolic Acid (PLAGA) polymer with the diameters about SO0 nm were deposited on the gold surface of a thickness shear mode (TSM) micro viscoelastic sensor operating at 10 MHz. The NF thin film coated TSM sensors exposed to gaseous and liquid media under various ambient conditions.

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This paper describes a novel acoustic wave sensor designed for identification of chemical reactions. The principle of operation of the sensor is based on the acoustic emission (AE) phenomena. Chemical changes taking place during reactions are accompanied by energy transfer with some of the energy converted into acoustic waves. The AE waves frequency spectra exhibited unique patterns for the studied chemical reactions, and were used for their identification. A backpropagating neural network was used to implement the recognition of the AE chemical pattern. Potential applications of the AE chemical sensor include process control in the chemical, food, medica1 and pharmaceutical industries. 0-78U3-5400-1/99/ ! 3 10.00 8 1999 IEEE