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A novel power-controlling approach for integrated, conductometric gas sensors

Barillaro, G; Lazzerini, GM; Strambini, LM; (2009) A novel power-controlling approach for integrated, conductometric gas sensors. In: Brugger, J and Briand, D, (eds.) PROCEEDINGS OF THE EUROSENSORS XXIII CONFERENCE. (pp. 188 - 191). ELSEVIER SCIENCE BV

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Abstract

An original power controlling driving/reading circuit for Porous Silicon JFET (PSJFET) gas sensors is presented. The PSJFET is an integrated p-channel JFET with two independent gates: a meso-structured PS layer, acting as a sensing, floating gate, which modulates the JFET current upon adsorption/desorption of specific analytes, and a high-impedance electric gate, which allows the JFET current tuning independently from analytes in the environment. The circuit exploits the independence of the sensing and electrical gate terminals to set/control the sensor power-dissipation, which is kept almost constant independently from adsorption/desorption-induced effects, while simultaneously carrying out a current-voltage conversion. For such a purpose, a negative feedback loop is used to modulate the PSJFET electric gate voltage, which becomes the output signal, while keeping constant the source-drain sensor current and, hence, the power dissipation. The proposed approach is validated by performing time-resolved measurements on PSJFET sensors under different NO2 concentrations (100ppb, 300ppb, 500ppb), at room temperature.

Type: Proceedings paper
Title: A novel power-controlling approach for integrated, conductometric gas sensors
Event: 23rd Eurosensors Conference
Location: Lausanne, SWITZERLAND
Dates: 2009-09-06 - 2009-09-09
DOI: 10.1016/j.proche.2009.07.047
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/140432
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