Twenty-five years of field effect gas sensor research in Linköping

Lundström, Ingemar; Sundgren, H.; Winquist, Fredrik; Eriksson, Mats; Krantz‐Rülcker, Christina; Spetz, Anita Lloyd

doi:10.1016/j.snb.2006.09.046

Cited by 165 publications

(124 citation statements)

References 51 publications

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“…better thermal stability. Hence, the possibility of producing nanocomposite coatings with Pt and TiC x /a-C is interesting to investigate [3,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Carbide and nanocomposite thin films in the Ti–Pt–C system

Lewin

Buchholt

et al. 2010

Thin Solid Films

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Thin films in the Ti-Pt-C system were deposited by non-reactive, DC-magnetron sputtering.Samples were characterised using X-ray photoelectron spectroscopy, X-ray diffraction, and transmission electron microscopy. A previously not reported metastable solid solution carbide, (Ti 1-x Pt x )C y with a Pt/Ti ratio of up to 0.43 was observed. This solid solution phase was present both as single phase in polycrystalline samples, and together with amorphous carbon (a-C) in nanocomposite samples. Annealing of nanocomposite samples lead to decomposition of the solid solution phase and formation of a nc-TiC x /a-C/nc-Pt nanocomposite. Test sensors for automotive gas exhausts manufactured from such a three-phase material suffers from complete oxidation of the coating at 400 °C with no observed sensor activity.

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“…better thermal stability. Hence, the possibility of producing nanocomposite coatings with Pt and TiC x /a-C is interesting to investigate [3,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Carbide and nanocomposite thin films in the Ti–Pt–C system

Lewin

Buchholt

et al. 2010

Thin Solid Films

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“…This voltage drop is influenced in the presence of various reducing and oxidizing gases. The response mechanism for hydrogen containing gases is mainly based on formation of polar hydroxide groups on the insulator surface at the metal insulator interface [4], [21]. Non-hydrogen containing dipole gases like CO and NO may also directly form dipoles or charged species on uncovered patches of the insulator [22], [23].…”

Section: A Sensor Devicementioning

confidence: 99%

“…It is interesting to note that the sensor reaction to NH 3 and C 3 H 6 changes its sign when oxygen is present. This can be explained by the sensing mechanism now being dominated by the reaction of the gas with adsorbed oxygen and spill-over effects [4], [21].…”

Section: B Influence Of Background Oxygenmentioning

confidence: 99%

“…It is known that the influence of humidity on the sensing properties of field effect gas sensors is not as strong as for metal oxide gas sensors. It was reported that for MISiC-FETs the influence of water vapor is constant for humidity levels above 2% [4], [7] while there is strong humidity dependence for MOX sensors over practically the whole range [29], [30]. However, the influence was studied again due to the fact that the FET gas sensor is now run in TCO.…”

Section: Influence Of Water Vapormentioning

confidence: 99%

“…The advantages of both types can be combined in a field effect transistor (FET). Using a catalytic gate material like palladium, platinum or iridium the device can be made gas sensitive [4]. Metal insulator silicon carbide field effect transistors (MISiC FET), especially, seem to be suitable candidates for emission control and on board diagnostics (OBD) [5].…”

mentioning

confidence: 99%

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Increasing the Selectivity of Pt-Gate SiC Field Effect Gas Sensors by Dynamic Temperature Modulation

et al. 2012

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Abstract-Based on a diode coupled silicon carbide field effect transistor with platinum as catalytic gate material, the influence of dynamic temperature modulation on the selectivity of GasFETs has been investigated. This operating mode, studied intensively for semiconductor gas sensors, has only recently been applied to field effect transistors. A suitable temperature cycle (T-cycle) for detection of typical exhaust gases (CO, NO, C 3 H 6 , H 2 , NH 3 ) was developed and combined with appropriate signal processing. The sensor data was evaluated using multivariate statistics, e.g. linear discriminant analysis (LDA). Measurements have proven that typical exhaust gases can be discriminated in backgrounds with 0%, 10% and 20% oxygen. Furthermore, we are able to quantify the mentioned gases and to determine unknown concentrations based on training data. Very low levels of relative humidity (r.h.) below a few percent influence the sensor response considerably but for higher levels the cross interference of humidity is negligible. In addition, experiments regarding stability and reproducibility were performed.

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Discovery and Optimization of Sensing Materials Using Discrete and Gradient Arrays

Potyrailo

2012

Soft Matter Gradient Surfaces

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Twenty-five years of field effect gas sensor research in Linköping

Cited by 165 publications

References 51 publications

Carbide and nanocomposite thin films in the Ti–Pt–C system

Carbide and nanocomposite thin films in the Ti–Pt–C system

Increasing the Selectivity of Pt-Gate SiC Field Effect Gas Sensors by Dynamic Temperature Modulation

Discovery and Optimization of Sensing Materials Using Discrete and Gradient Arrays

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