Patent ID: 8544314

Claim:
A carbon dioxide sensor comprising: a first beam that includes a functionalized surface, wherein the functionalized surface of the first beam is a silicon surface that is connected to a 1,8 DIAZA BICYCLO [5,4,0]UNDEC-7-ENE (DBU) by alkyl chains; a second beam that includes a functionalized surface, wherein the functionalized surface of the second beam is a silicon surface that is connected to a 1,8 DIAZA BICYCLO [5,4,0]UNDEC-7-ENE (DBU) by alkyl chains, and wherein the functionalized surface of the second beam is altered to inhibit adsorption of carbon dioxide such that differential sensing of carbon dioxide may be performed by monitoring changes in the resonant frequency of the first beam relative to the resonant frequency of second beam; a first frequency measuring circuit that measures the resonant frequency of the first beam; and a second frequency measuring circuit that measures the resonant frequency of the second beam; and a control that analyzes the signals from the first frequency measuring circuit and the second frequency measuring circuit to perform differential sensing for determining the amount of carbon dioxide exposure of the carbon dioxide sensor.