Chemical sensor and coating for same
First Claim
1. An acoustic wave-based chemical sensor, comprising:
- a substrate;
at least two electrodes connected to the substrate; and
a coating positioned over the substrate and at least one of the electrodes, the coating consisting of graphite microparticles.
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Abstract
An acoustic wave based-chemical sensor containing a crystal substrate and a coating of small particulate matter is disclosed. The small particulate matter can be graphite particles. 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 coating absorbs the analyte, thus changing the mass of the 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 small particulate matter results in a coating having a large surface area which facilitates mass uptake of large amounts of VOCs, improved acoustic properties even with relatively thick coatings, and a high operational temperature range.
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Citations
26 Claims
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1. An acoustic wave-based chemical sensor, comprising:
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a substrate;
at least two electrodes connected to the substrate; and
a coating positioned over the substrate and at least one of the electrodes, the coating consisting of graphite microparticles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. A coating for an acoustic wave based-chemical sensor, the coating consisting of graphite microparticles.
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19. A method of detecting volatile organic compounds using an acoustic wave-based chemical sensor comprising:
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a substrate;
at least two electrodes connected to the substrate; and
a coating positioned over the substrate and at least one of the electrodes, the coating consisting of graphite microparticles. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification