Development of microwave gas sensors

Abstract This work presents a novel approach in gas detection by an original method of microwave transduction. The design of the sensor includes a coplanar grounded wave guide with a gas sensing material to study its sensitivity to ammonia in argon flux. The sensing material can play the role of the substrate or can be deposited as a thin layer on a microstrip structure used in electronics. Submitted to an electromagnetic excitation in microwave energies, the sensor response in the presence of a gas results in a specific modification of the reflected wave (real and imaginary parts). The goals of this study include an examination of the form of the sensitive material and its influence on the response of the microwave gas sensor. Two cases are considered: bulk or thin layer. In bulk case, the material plays the role of the substrate of the microstrip structure. In the second case, a thin layer is deposited on the sensor. We showed how, in the presence of ammonia, the reflected wave is related to its concentration. The response to the material–gas interaction depends on the excitation frequency. The parameter used as the sensor response is the ratio of the reflected wave on the incident wave at each frequency. The study deals with the influence of molecular sensing materials (CoPc) on the response of the sensor in the presence of ammonia. All the measurement were carried out at room temperature.

[1]  J. Brunet,et al.  On-board phthalocyanine gas sensor microsystem dedicated to the monitoring of oxidizing gases level in passenger compartments , 2008 .

[2]  Chen Yuquan,et al.  SAW gas sensor with proper tetrasulphonated phthalocyanine film , 1994 .

[3]  D. Stuerga,et al.  Broadband microwave gas sensor: A coaxial design , 2010 .

[4]  Thomas Nirmaier,et al.  Sensitive NO2 detection with surface acoustic wave devices using a cyclic measuring technique , 2000 .

[5]  I. Lundström,et al.  An electronic tongue based on voltammetry , 1997 .

[6]  Ralf Moos,et al.  Direct Catalyst Monitoring by Electrical Means: An Overview on Promising Novel Principles , 2009 .

[7]  Jérôme Brunet,et al.  Molecular semiconductor-doped insulator (MSDI) heterojunctions: an alternative transducer for gas chemosensing. , 2009, The Analyst.

[8]  R. Gutierrez-Osuna,et al.  Fusion of three sensory modalities for the multimodal characterization of red wines , 2004, IEEE Sensors Journal.

[9]  G. G. Roberts,et al.  Surface acoustic wave sensors incorporating Langmuir-Blodgett films , 1988 .

[10]  G. Collins,et al.  Chemiresistor gas sensors based on photoconductivity changes in phthalocyanine thin films: enhancement of response toward ammonia by photoelectrochemical deposition with metal modifiers , 1990 .

[11]  J. Saja,et al.  On the effect of ammonia and wet atmospheres on the conducting properties of different lutetium bisphthalocyanine thin films , 2008 .

[12]  Neal A. Rakow,et al.  A colorimetric sensor array for odour visualization , 2000, Nature.

[13]  J. Rossignol,et al.  Rapid synthesis of tin (IV) oxide nanoparticles by microwave induced thermohydrolysis , 2008 .

[14]  A. Pauly,et al.  Influence of peripheral electron-withdrawing substituents on the conductivity of zinc phthalocyanine in the presence of gases. Part 2 : oxidizing gases , 1998 .

[15]  E. Maciak,et al.  Metal-free phthalocyanine and palladium sensor structure with a polyethylene membrane for hydrogen detection in SAW systems , 2007 .

[16]  D. Stuerga,et al.  Metal oxide-based gas sensor and microwave broad-band measurements: an innovative approach to gas sensing , 2007 .

[17]  Inta Muzikante,et al.  A Novel Gas Sensor Transducer Based on Phthalocyanine Heterojunction Devices , 2007, Sensors.

[18]  A. Thionnet,et al.  Une nouvelle technique de détection des endommagements dans les composites basée sur l utilisation des micro-ondes et des circuits microrubans résonants , 2006 .

[19]  S. C. Thorpe,et al.  Fast response metal phthalocynanine-based gas sensors , 1989 .

[20]  Joan Ramon Morante,et al.  Gas detection with SnO2 sensors modified by zeolite films , 2007 .

[21]  Daniel Filippini,et al.  Chemical sensing with familiar devices. , 2006, Angewandte Chemie.

[22]  S. K. Gupta,et al.  Detection of reducing gases by SnO2 thin films: an impedance spectroscopy study , 2005 .

[23]  Udo Weimar,et al.  Copper phthalocyanine suspended gate field effect transistors for NO2 detection , 2006 .

[24]  Marcel Bouvet,et al.  Phthalocyanine-based field-effect transistor as ozone sensor , 2001 .

[25]  H. Xiong,et al.  Electrical transduction in phthalocyanine-based gas sensors: from classical chemiresistors to new functional structures , 2009 .

[26]  M. Reyes-Barranca,et al.  New chemical sensor based on a MOS transistor with rear contacts and two flat surfaces , 1996 .

[27]  Resistance and capacitance analysis of Pd-doped and undoped SnO2 thick films sensors exposed to CO atmospheres , 2006 .

[28]  Göran Gustafsson,et al.  Determination of field-effect mobility of poly(3-hexylthiophene) upon exposure to NH3 gas , 1990 .

[29]  Jérôme Brunet,et al.  Improvement in real time detection and selectivity of phthalocyanine gas sensors dedicated to oxidizing pollutants evaluation , 2005 .

[30]  J. Rossignol,et al.  Physique/Physique appliquée Développement d'un nouveau capteur de gaz basé sur la détection à large bande micro-onde , 2007 .

[31]  Antonio J. Ricco,et al.  Surface acoustic wave gas sensor based on film conductivity changes , 1985 .

[32]  Irina I. Ivanova,et al.  Surface chemistry of nanocrystalline SnO2: Effect of thermal treatment and additives , 2007 .

[33]  Ralf Moos,et al.  Catalysts as Sensors—A Promising Novel Approach in Automotive Exhaust Gas Aftertreatment , 2010, Sensors.