Selectivity improvement of semi-conducting gas sensors by selective filter for atmospheric pollutants detection

The monitoring of atmospheric pollution using chemical gas sensors is a challenge due to the lack of selectivity of most existing devices. However, their performances can be improved using filtering films achieving the separation or the removal of some gases. This study is focused on the detection of carbon monoxide and of oxidant pollutants (nitrogen dioxide and ozone) by sensors constituted of SnO2, or phthalocyanine compounds. Two types of filters were investigated. Filters based on MnO2 powder are successful to remove ozone while preserving nitrogen dioxide in a large temperature range from ambient to 400 -C, but they partially convert carbon monoxide. The second type of filter constituted of indigo powder is also efficient to remove ozone without modification of nitrogen concentration at ambient. Then, these filters were associated with sensing element. MnO2 thick films were deposited by screen-printing on SnO2. With resulting sensors, the interference of ozone for the detection of CO or of NO2 is reduced, but some technological problems such as adhesion of MnO2 layer have to be solved. For phthalocyanine devices, the indigo filter placed upstream to the sensitive layer makes the sensor selective to nitrogen dioxide.

[1]  G. Tournier,et al.  The influence of a platinum membrane on the sensing properties of a tin dioxide thin film , 2002 .

[2]  H. Meixner,et al.  Selectivity in high-temperature operated semiconductor gas-sensors , 1998 .

[3]  M. Straka,et al.  Residual aqueous ozone determination by gas diffusion flow injection analysis , 1985 .

[4]  René Lalauze,et al.  Physico-chemical contribution of gold metallic particles to the action of oxygen on tin dioxide sensors , 2003 .

[5]  N. Bârsan,et al.  In2O3 and MoO3–In2O3 thin film semiconductor sensors: interaction with NO2 and O3 , 1998 .

[6]  Christophe Pijolat,et al.  Development of tin oxide material by screen-printing technology for micro-machined gas sensors , 2003 .

[7]  Hidemoto Nakagawa,et al.  The interference elimination for gas sensor by catalyst filters , 2000 .

[8]  E. H. Adema,et al.  Monitoring ambient ozone with a passive measurement technique method, field results and strategy , 1996 .

[9]  M. Ivanovskaya,et al.  Mechanism of O3 and NO2 detection and selectivity of In2O3 sensors , 2001 .

[10]  John F. Currie,et al.  Micromachined thin film solid state electrochemical CO2, NO2 and SO2 gas sensors , 1999 .

[11]  Karel Štulík,et al.  An amperometric solid-state NO2 sensor with a solid polymer electrolyte and a reticulated vitreous carbon indicator electrode , 2000 .

[12]  C. Feng,et al.  Effect of Gas Diffusion Process on Sensing Properties of SnO2 Thin Film Sensors in a SiO2 / SnO2 Layer‐Built Structure Fabricated by Sol‐Gel Process , 1994 .

[13]  Theodor Doll,et al.  Conductivity and work function ozone sensors based on indium oxide , 1998 .

[14]  C. Pijolat,et al.  Tin dioxide gas sensor as a tool for atmospheric pollution monitoring: Problems and possibilities for improvements , 2003 .

[15]  Giorgio Sberveglieri,et al.  Ozone detection using low-power-consumption metal–oxide gas sensors , 1999 .

[16]  J. Brunet,et al.  Evaluation of atmospheric pollution by two semiconductor gas sensors , 2001 .

[17]  G. Tournier,et al.  Effect of a platinum membrane on the sensing properties of materials based on thin and thick tin dioxide films , 2002 .

[18]  Michele Penza,et al.  NOX GAS SENSING CHARACTERISTICS OF WO3 THIN FILMS ACTIVATED BY NOBLE METALS (PD, PT, AU) LAYERS , 1998 .

[19]  K. Fukui,et al.  H2 selective gas sensor based on SnO2 , 1998 .

[20]  G. Cass,et al.  Ozone fading of natural organic colorants: mechanisms and products of the reaction of ozone with indigos. , 1988, Environmental Science and Technology.

[21]  J. Brezmes,et al.  Pt-loaded Al2O3 catalytic filters for screen-printed WO3 sensors highly selective to benzene , 2004 .

[22]  Norio Miura,et al.  A COMPACT SOLID-STATE AMPEROMETRIC SENSOR FOR DETECTION OF NO2 IN PPB RANGE , 1998 .

[23]  A. Pauly,et al.  Doping mechanisms of phthalocyanines by oxidizing gases: Application to gas sensors , 1994 .

[24]  John D. Wright,et al.  Gas adsorption on phthalocyanines and its effects on electrical properties , 1989 .

[25]  P. Hauptmann.  Sensors: A Comprehensive Survey , 1996 .

[26]  T. A. Jones,et al.  Gas-induced electrical conductivity changes in metal phthalocyanines☆ , 1986 .

[27]  Peter C. Hauser,et al.  Sensitive electrochemical detection of ozone , 2002 .

[28]  Claude Lucat,et al.  The thick film route to selective gas sensors , 1995 .

[29]  Y. Nishioka,et al.  A novel semiconductor NO gas sensor operating at room temperature , 1998 .

[30]  Christophe Pijolat,et al.  Application of membranes and filtering films for gas sensors improvements , 2005 .

[31]  S. N. Malchenko,et al.  In2O3-based gas sensors , 1993 .

[32]  Yung Kwon Sung,et al.  Ozone sensing properties of In2O3-based semiconductor thick films , 2000 .

[33]  Maria Luisa Grilli,et al.  The NO2 response of solid electrolyte sensors made using nano-sized LaFeO3 electrodes , 2001 .

[34]  Gian Carlo Cardinali,et al.  Gas sensors for air quality monitoring: realisation and characterisation of undoped and noble metal-doped SnO2 thin sensing films deposited by the pulsed laser ablation , 1999 .

[35]  René Lalauze,et al.  Gas detection for automotive pollution control , 1999 .

[36]  W. Göpel,et al.  Filters for tin dioxide CO gas sensors to pass the UL2034 standard , 2000 .

[37]  K. Maeda,et al.  Solid electrolyte NOx sensor using pyrochlore-type oxide electrode 1 Devoted to the late Dr Tetsuro , 1998 .

[38]  Giorgio Sberveglieri,et al.  Investigation on the O3 sensitivity properties of WO3 thin films prepared by sol–gel, thermal evaporation and r.f. sputtering techniques , 2000 .

[39]  Norio Miura,et al.  Potentiometric NOx sensor based on stabilized zirconia and NiCr2O4 sensing electrode operating at high temperatures , 2001 .

[40]  Juntao Lu,et al.  A Solid‐State Ozone Sensor Based on Solid Polymer Electrolyte , 1998 .

[41]  Christophe Pijolat,et al.  Selectivity improvement of SnO2 films by superficial metallic films , 1999 .

[42]  Norio Miura,et al.  HIGH-TEMPERATURE POTENTIOMETRIC/AMPEROMETRIC NOX SENSORS COMBINING STABILIZED ZIRCONIA WITH MIXED-METAL OXIDE ELECTRODE , 1998 .