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A wireless LC chemical sensor based on a high quality factor EIS capacitor
- Source :
-
Sensors & Actuators B: Chemical . Oct2007, p648-654. 7p. - Publication Year :
- 2007
-
Abstract
- Abstract: This paper reports on the concept, design, fabrication and experimental results of a new passive wireless sensor for pH measurements. The sensor is based on a LC resonator formed by an inductor and an electrolyte–insulator–silicon (EIS) capacitor working as a pH-to-capacitance transductor. A reference electrode is used to obtain a stable dc potential at the electrolyte. An additional comb-like electrode located on the surface of the insulator is also provided to obtain a low ac impedance. Using this double-electrode scheme a Q larger than 15 is achieved for a wide range of conductivities. Wireless measurements of the LC sensor yields a sensitivity of 1.0% frequency change per pH unit. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09254005
- Database :
- Academic Search Index
- Journal :
- Sensors & Actuators B: Chemical
- Publication Type :
- Academic Journal
- Accession number :
- 26680331
- Full Text :
- https://doi.org/10.1016/j.snb.2007.04.025