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Phthalocyanine based integrated gas sensor

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: Carmen Moldovan, Lavinia G. Hinescu, Rodica Iosub, Mihail Hinescu, Mihai Nisulescu, Bogdan Firtat, Mircea Modreanu, Dan Dascalu, Victor Voicu, Cornel Tarabasanu

Editorial: Semiconductor Conference, 2002. CAS 2002 Proceedings. International, 1, p.55-58, 2002.


This paper presents the layout and the technological steps for an interdigitally integrated capacitor used for gas detection. Silicon micromachining technology is applied for manufacturing the sensor substrate. The sensitive layer used is phthalocyanine (Pc) deposed by EDL (evaporated dyes layers technique). Many solutions were found using the phthalocyanine derivatives deposition technique. Considering the different sensitivities of phthalocyanines derivatives, we obtained different gas sensors. The copper phthalocyanine (Cu Pc) and nickel phthalocyanine (Ni Pc) have been investigated for NO/sub x/ detection. The measurement of sensors for NO/sub x/ and NH/sub 3/ detection are presented as concentration versus impedance. The microsensor testing structures deposited with phthalocyanines were investigated by impedance measurements in a vacuum chamber controlled by a gas analyzer. The measurements were made at room temperature but a medium temperature is applied (< 200/spl deg/C) after measurement, for cleaning the material in order to reuse the sensor. The sensor is integrated, MOS compatible, cheap, easy to use and has low power consumption.

Cuvinte cheie: phthalocyanine sensor, silicon technology, evaporated dyes layers