Direct write sensors
A method of making an acoustic wave sensor includes the steps of providing a piezoelectric substrate layer and printing on the substrate layer a sensor layer comprising a first interdigitated acoustic wave transducer, a sensing film, and positioned on an opposing side of the sensing film from the first interdigitated acoustic wave transducer at least one selected from the group consisting of a second interdigitated acoustic wave transducer and a Bragg reflector. An insulation layer can be printed. An antenna can be printed in an antenna layer, and the insulation layer can be interposed between the antenna layer and the sensor layer. An electrical connection can be printed between the antenna and the first interdigitated acoustic wave transducer. An acoustic wave sensor is also disclosed.
1. An acoustic wave sensor, comprising:
a piezoelectric substrate layer;
a sensor layer joined to the substrate layer and comprising a first interdigitated acoustic wave transducer and at least one other feature selected from the group consisting of a sensing film, an interdigitated acoustic wave transducer, and a Bragg reflector;
wherein all of the interdigitated acoustic wave transducers and Bragg reflector are aerosol jet printed;
an antenna layer and an insulation layer interposed between the antenna layer and the sensor layer, wherein the insulation layer and antenna layer are aerosol jet printed; and,
wherein at least one of the sensor layer and antenna layer comprise a dielectric matrix material.
2. An acoustic wave sensor, comprising:
a piezoelectric substrate layer;
a sensor layer joined to the substrate layer and comprising a first interdigitated acoustic wave transducer and at least one other feature selected from the group consisting of a sensing film, an interdigitated acoustic wave transducer, and a Bragg reflector;
wherein all of the interdigitated acoustic wave transducers and Bragg reflector are aerosol jet printed;
an antenna layer and an insulation layer interposed between the antenna layer and the sensor layer, wherein the insulation layer and antenna layer are aerosol jet printed; and,
wherein the sensor layer and the antenna layer are printed on opposing sides of the piezoelectric substrate layer.