| CPC G01N 27/327 (2013.01) [G01N 27/4145 (2013.01)] | 11 Claims |

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1. A sensor device, adapted to detect glucose concentration in saliva of an object, comprising:
a conductive substrate;
a polymer layer disposed on said conductive substrate and made from conducting polymer; and
a plurality of carbon-nanotube layers disposed on said polymer layer;
wherein a mixture of the saliva of the object and an enzyme is applied on the plurality of carbon-nanotube layers to detect the glucose concentration in the saliva, and
wherein said sensor device is free of the enzyme.
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