A carbon dioxide gas sensor based on solid electrolyte for air quality control

A solid-state CO 2 sensor device using a metal-insulator-silicon carbide (MISiC) capacitor combined with a Li 2 CO 3 -BaCO 3 auxiliary layer was fabricated and tested for its basic sensing properties. The MISiC-based CO 2 sensor attached with the carbonate showed typical capacitance-voltage (C-V) properties in air at 400°C, and the sensor device responded well to changes in CO 2 concentration in air at 400°C. The sensor signals were directly proportional to the logarithm of CO 2 concentration. The results suggested that an electrochemical reaction of CO 2 occurred at the interface between the carbonate layer and the electrode, causing the applied voltage to shift in response to CO 2 .

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“…So far, potentiometric, [1][2][3][4][5][6] amperometric, 7,8 resistive, [9][10][11] and metal-insulator-semiconductor (MIS)-type 12,13 .…”

Section: Introductionmentioning

confidence: 99%

CO[sub 2] Sensor Combining an MISiC Capacitor and a Binary Carbonate

Inoue

Andersson

Yuasa

et al. 2011

Electrochem. Solid-State Lett.

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“…In fact, Mauvy et al suggested that the detection limit of a NASICON Na + sensor is conditioned by the dissolution of an amorphous secondary phase identified as NaaPO 4 [10]. It has also been found that the sensing properties of NASICON CO2 sensors are hindered in contact with moisture, even at room temperature [13,14]. Kida et al [ 12] concluded that these limitations are intimately related to the degradation of the NASICON component of the sensor and, in particular, to the segregation of a Na3PO a phase at the surface in contact with the humid atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Optimised NASICON ceramics for Na+ sensing

Fuentes

Figueiredo

Marques

et al. 2002

Ionics

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Abstract. NASICON dense ceramics were obtained from solid state reaction between SiO2, Na3PO4.12H20 and two different types of zirconia: monoclinic ZrO2 and the yttria-doped tetragonal phase (ZrO2)o.97(Y203)ao 3. Higher temperatures were needed to obtain dense samples of the yttrium free composition (1265 ~ The electrical conductivity, at room temperature, of the yttria-doped samples sintered at 1230 ~ (0.20 S/m) is significantly higher than the value obtained with the material prepared from pure ZrO2. The impedance spectra show that the differences in conductivity are predominantly due to the higher grain boundary resistance of the undoped ceramics, probably due to formation of monoclinic zirconia and glassy phases along the grain boundary. Further improvement of the electrical conductivity could be achieved after optimization of the grain size and density of grain boundaries. A maximum conductivity value of about 0.27 S/m at room temperature was obtained with the yttria-doped samples sintered at 1220 ~ for 40 h. Yttria-doped and undoped ceramics were tested as Na § potentiometric sensors. The detection limit of the yttriadoped sample (10 .4 mold) was one order of magnitude lower than the obtained with the undoped material.

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“…In general, the stability of the sensor is a very important parameter because its lifetime should be at least from 2 to 3 years . Thermal stability is a parameter that will affect directly the potential use of the sensor.…”

Section: Resultsmentioning

confidence: 99%

Thin‐film Potentiometric Sensor to Detect CO₂ Concentrations Ranging Between 2 % and 100 %

Rojo¹,

Castro-Hurtado²,

Mandayo³

et al. 2017

Electroanalysis

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A potentiometric thin‐film sensor to detect CO2 in a wide range (2–100 %) has been developed. The system has been fabricated depositing a reference electrode of Pt, a solid electrolyte of YSZ (Yttria‐stabilized Zirconia), a sensing phase made of Li2CO3 and a working electrode of Au via Physical Vapor Deposition (PVD). Characterization of the different elements has provided the optimal fabrication parameters and the system response for CO2 concentrations can be measured from 2 to 100 % at 450 °C. The sensor behaves as a non‐Nerstian system and slightly deviates from a linear response with the logarithm of CO2 until the CO2 concentration reaches the 30 %. Higher CO2 amounts make the response divert more from the Nernst law but give a stable and reproducible response to CO2 in a wide range of concentrations. Based on these promising results the recovery time, stability, repeatability and selectivity of the sensor have been measured. The performance showed by the thin film sensor proves the feasibility of the use of this system for biogas and natural gas applications owing to its very good consistency at low temperature in a wide concentration range.

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A carbon dioxide gas sensor based on solid electrolyte for air quality control

Cited by 66 publications

References 2 publications

CO[sub 2] Sensor Combining an MISiC Capacitor and a Binary Carbonate

CO[sub 2] Sensor Combining an MISiC Capacitor and a Binary Carbonate

Optimised NASICON ceramics for Na+ sensing

Thin‐film Potentiometric Sensor to Detect CO₂ Concentrations Ranging Between 2 % and 100 %

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A carbon dioxide gas sensor based on solid electrolyte for air quality control

Cited by 66 publications

References 2 publications

CO[sub 2] Sensor Combining an MISiC Capacitor and a Binary Carbonate

CO[sub 2] Sensor Combining an MISiC Capacitor and a Binary Carbonate

Optimised NASICON ceramics for Na+ sensing

Thin‐film Potentiometric Sensor to Detect CO2 Concentrations Ranging Between 2 % and 100 %

Contact Info

Product

Resources

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Thin‐film Potentiometric Sensor to Detect CO₂ Concentrations Ranging Between 2 % and 100 %