Photo-induced sensitivity and selectivity of semiconductor gas sensors
First Claim
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1. A selective gas sensor, comprising:
- a semiconducting substrate;
a narrow band radiation source that directs narrowband radiation to the semiconducting substrate; and
a plurality of electrodes coupled to the semiconducting substrate, whereby a gas is selectively sensed.
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Abstract
A selective gas sensor comprises a semiconducting substrate, a radiation source that directs narrowband radiation to the semiconducting substrate; and a plurality of electrodes coupled to the semiconducting substrate, whereby a gas is selectively sensed. A method of selectively sensing a gas comprises the steps of contacting the semiconducting substrate with a gas, directing narrowband radiation to the semiconducting substrate and sensing the resistance of the semiconducting substrate, thereby selectively sensing the gas.
41 Citations
60 Claims
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1. A selective gas sensor, comprising:
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a semiconducting substrate;
a narrow band radiation source that directs narrowband radiation to the semiconducting substrate; and
a plurality of electrodes coupled to the semiconducting substrate, whereby a gas is selectively sensed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of selectively sensing a gas, comprising the steps of:
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contacting a semiconducting substrate with a gas;
directing narrowband radiation to the semiconducting substrate; and
sensing the resistance of the semiconducting substrate, thereby selectively sensing the gas. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. A selective gas sensor, comprising:
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a semiconducting substrate;
a solid state narrowband radiation source integrated with the semiconducting substrate that directs narrowband radiation to the semiconducting substrate, wherein the mean energy of the narrowband radiation is less than the bandgap energy of the semiconducting substrate;
the narrowband radiation is selectively absorbed by a complex, the complex comprising the semiconducting substrate and the gas to be selectively sensed; and
a plurality of electrodes coupled to the semiconducting substrate, whereby a gas is selectively sensed.
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- 57. The sensor of claim 57, wherein the semiconducting substrate is SnO2, TiO2, ZnO, WO3, Fe2O3, In2O3, Ga2O3, SrTiO3, BaTiO3, CdS, GaAs, GaN, or Si.
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58. A method of selectively sensing a gas, comprising the steps of:
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contacting a semiconducting substrate with a gas;
directing narrowband radiation to the semiconducting substrate from a solid state narrowband radiation source integrated with the semiconducting substrate, wherein the mean energy of the narrowband radiation is less than the bandgap energy of the semiconducting substrate;
the narrowband radiation is selectively absorbed by a complex, the complex comprising the semiconducting substrate and the gas; and
sensing the resistance of the semiconducting substrate, thereby selectively sensing the gas.
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- 59. The method of claim 59, further including sensing at least two distinct gases.
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