CO2 sensing with gas sensors based on rare-earth compounds: Material exploration

Suzuki, Toshiharu; Sackmann, André; Lauxmann, Frieder; Berthold, Christoph; Weimar, Udo; Bârsan, Nicolae

doi:10.1016/j.snb.2020.128128

Cited by 23 publications

(14 citation statements)

References 41 publications

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“…In the presence of CO 2 , the resistance of the samples increases and returns to the initial value in pure air (Figure 6) in accordance to previously observed by other researchers [69]. The temperature dependence of the sensor response towards CO 2 demonstrates maximum at 470 • C, which is shifted down to 410 • C with the increase in air relative humidity (Figure 7).…”

Section: Gas Sensor Propertiessupporting

confidence: 90%

“…In addition to the main trend, the intensity of OH vibrations decreases slightly with the introduction of CO 2 , and also increases slightly with subsequent exposure in the air. This indicates the replacement of some hydroxyls by adsorbed carbonates due to competitive adsorption [69]. In general, the concentration of hydroxyls approaches a stationary value for two hours at 410 • C. On the contrary, the intensities of carbonate peaks strongly depend on the composition of the gas phase: their intensities increase in the presence of CO 2 , and then decrease with subsequent exposure in the air.…”

Section: Gas Sensor Propertiesmentioning

confidence: 94%

“…This may be due to hydroxyls recombination and desorption at a temperature of 410 • C even in a humid atmosphere. In the 1700-800 cm −1 range one can observe the positive bands corresponding to monodentate (1520 and 853 cm −1 ) and bidentate (1285 cm −1 ) surface carbonate species, respectively [69]. A sharp band at 1085 cm −1 can be assigned to carbonate group of lanthanum oxycarbonate [71].…”

Section: Gas Sensor Propertiesmentioning

confidence: 94%

“…Some characteristics of metal oxide semiconductor (MOS) gas sensors are summarized in Table 1 . The highest sensor response is demonstrated by materials based on lanthanum oxide [69]. However, for the widespread use of semiconductor sensors for continuous long-term monitoring of GHG in atmospheric air, it is still necessary: (i) to develop new materials with high selective sensitivity to target gases; (ii) to develop scalable technologies for the synthesis of materials and the formation of a sensitive layer that allows production of a large number of sensor elements with identical characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Flame-Made La2O3-Based Nanocomposite CO2 Sensors as Perspective Part of GHG Monitoring System

Andreev

Platonov

Филатова

et al. 2021

Sensors

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Continuous monitoring of greenhouse gases with high spatio-temporal resolution has lately become an urgent task because of tightening environmental restrictions. It may be addressed with an economically efficient solution, based on semiconductor metal oxide gas sensors. In the present work, CO2 detection in the relevant concentration range and ambient conditions was successfully effectuated by fine-particulate La2O3-based materials. Flame spray pyrolysis technique was used for the synthesis of sensitive materials, which were studied with X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs) and low temperature nitrogen adsorption coupled with Brunauer–Emmett–Teller (BET) effective surface area calculation methodology. The obtained materials represent a composite of lanthanum oxide, hydroxide and carbonate phases. The positive correlation has been established between the carbonate content in the as prepared materials and their sensor response towards CO2. Small dimensional planar MEMS micro-hotplates with low energy consumption were used for gas sensor fabrication through inkjet printing. The sensors showed highly selective CO2 detection in the range of 200–6667 ppm in humid air compared with pollutant gases (H2 50 ppm, CH4 100 ppm, NO2 1 ppm, NO 1 ppm, NH3 20 ppm, H2S 1 ppm, SO2 1 ppm), typical for the atmospheric air of urbanized and industrial area.

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Section: Gas Sensor Propertiessupporting

confidence: 90%

Section: Gas Sensor Propertiesmentioning

confidence: 94%

Section: Gas Sensor Propertiesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flame-Made La2O3-Based Nanocomposite CO2 Sensors as Perspective Part of GHG Monitoring System

Andreev

Platonov

Филатова

et al. 2021

Sensors

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“…The polaron conductivity and luminescent mechanisms of the lanthanides (Ln) derived from 4f-4f transition have been studied for the past few decades [1][2][3][4][5] and gained extensive attention in various fields, such as thinfilm crystals, 6 multifunctional ceramics, 7,8 laser emitters, 9 photocatalysts, 10,11 gas phase sensors, 12,13 and so on.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

et al. 2022

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Solid‐solution ceramics show a potential in the field of electronic devices. In particular, it is necessary to investigate the photoluminescence and conductive properties of CaEuNbMoO8 (CENMO) solid solution ceramics. It is demonstrated that the sintered ceramics appear as CaMoO4 phase with scheelite structure. The results of X‐ray photoelectron spectroscopy show that the abnormal reduction of Eu3+→Eu2+ occurs in the ceramics, which is due to the formation of VCa′′$V_{Ca}^{^{\prime\prime}}$ vacancy caused by the substitution of Ca2+ by Eu3+, making it act as electron donors. The change of local symmetry of Eu3+ ions in ceramics results in a strong red fluorescence, and the charge transition between Eu, Nb, and Mo ions and O ions in the host lattice results in the near‐ultraviolet (near‐UV) excitation. As a result, CaEuNbMoO8 ceramic materials have promising applications in both near‐ultraviolet excited light‐emitting diodes and thermistors.

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Interfacial Catalysis Enabled Acetone Sensors Based on Rationally Designed Mesoporous Metal Oxides with Erbium‐Doped WO₃ Framework

Liu

Gao

et al. 2022

Adv Materials Inter

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The emerging combination of Internet of Things requires the development of intelligent gas sensor, and semiconductor gas sensors based on metal oxides have been widely applied in industrial production, environmental monitoring, and food safety. Although versatile nanomaterials have been exploited as gas sensitive materials, restricted gas sensing performance including sensitivity, selectivity and stability, is still the fatal problem of practical applications. Herein, inspired by heteratomic doping engineering, unique rare earth erbium (Er)‐doped mesoporous tungsten oxide (Er/mWO3) has been synthesized via one‐step collaborative coassembly strategy, and Er ion‐doped mWO3 exhibited peculiarly hexagonal mesostructure (P63/mmc), tunable specific surface area (58.1–78.3 m2 g–1), uniform mesoporous size and highly crystallized framework with heteroatomic pore wall doping. The introduction of Er can significantly adjust the micro/nano structure and band characteristics, and 1.5 wt% Er‐doped mWO3 displays superior acetone sensing performance, including high response values (107 for 50 ppm), rapid response–recovery dynamics (9/56 s), prominent acetone selectivity, low concentration detection (125 ppb), anti‐humidity property and excellent long‐term stability. Such an excellent sensing performance is mainly attributed to unique interfaces catalytic sites induced by heteroatom interstitial doping. This finding opens a door for the design of smart gas sensors for environmental monitoring and industrial safety.

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CO2 sensing with gas sensors based on rare-earth compounds: Material exploration

Cited by 23 publications

References 41 publications

Flame-Made La2O3-Based Nanocomposite CO2 Sensors as Perspective Part of GHG Monitoring System

Flame-Made La2O3-Based Nanocomposite CO2 Sensors as Perspective Part of GHG Monitoring System

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

Interfacial Catalysis Enabled Acetone Sensors Based on Rationally Designed Mesoporous Metal Oxides with Erbium‐Doped WO₃ Framework

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CO2 sensing with gas sensors based on rare-earth compounds: Material exploration

Cited by 23 publications

References 41 publications

Flame-Made La2O3-Based Nanocomposite CO2 Sensors as Perspective Part of GHG Monitoring System

Flame-Made La2O3-Based Nanocomposite CO2 Sensors as Perspective Part of GHG Monitoring System

Photoluminescence and conductive properties of CaEuNbMoO8 solid‐solution ceramics

Interfacial Catalysis Enabled Acetone Sensors Based on Rationally Designed Mesoporous Metal Oxides with Erbium‐Doped WO3 Framework

Contact Info

Product

Resources

About

Photoluminescence and conductive properties of CaEuNbMoO₈ solid‐solution ceramics

Interfacial Catalysis Enabled Acetone Sensors Based on Rationally Designed Mesoporous Metal Oxides with Erbium‐Doped WO₃ Framework