Sm2O3 doped-SnO2 nanoparticles, very selective and sensitive to volatile organic compounds

Ahmadnia-Feyzabad, Sadegh; Mortazavi, Yadollah; Khodadadi, Abbas Ali; Hemmati, Sahar

doi:10.1016/j.snb.2013.02.101

Cited by 54 publications

(13 citation statements)

References 28 publications

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“…22 Oxygen species on the SnO 2 surface are in the form of O − and O 2− at higher temperatures. 15 For VOCs containing an oxygen atom in their structure, including acetaldehyde, ethanol and acetone, possible oxidations with O − are as follows: 16,17 …”

Section: Resultsmentioning

confidence: 99%

Coupled Metal Oxide-Doped Pt/SnO₂Semiconductor and Yittria-Stabilized Zirconia Electrochemical Sensors for Detection of VOCs

kasalizadeh

Khodadadi

Mortazavi

2013

J. Electrochem. Soc.

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Yttria-stabilized zirconia (YSZ)-based sensors using Pt/SnO 2 -based sensing electrodes were fabricated and applied to detect several volatile organic compounds (VOCs) including acetaldehyde, acetone, ethanol and toluene. The whole sensor was exposed to the VOCs-contaminated air, i.e. without air reference. YSZ was prepared by coprecipitation, calcined, pelleted, and sintered at 1560 • C for 12 h. The YSZ pellet was coated with two layers of porous Pt electrode, on one of which as the sensing electrode, a layer of Pt/SnO 2 doped with SiO 2 , MoO 3 , CeO 2 or Sm 2 O 3 was screen printed. The oxide-doped Pt/SnO 2 samples were prepared by a sol-gel method and characterized by XRD, SEM, and BET. As 5 wt% SiO 2 or Sm 2 O 3 is doped onto the Pt/SnO 2 , the crystallite size decreases from 17 to 6 or 8 nm, respectively. An automated flow system was used for evaluating the sensors performances in presence of various VOCs of different concentrations at 350-600 • C. Response/recovery times of all VOCs sensors decrease with the oxide doping. Pt/SnO 2 doped with 5 wt% CeO 2 , compared to other oxides, shows the highest EMF responses and lowest response and recovery times to the VOCs. By increasing the Pt/CeO 2 /SnO 2 sensing layer thickness, EMF response is enhanced and maximum response shifts to higher temperatures.Among the available sensing materials and techniques used to detect pollutant gases, solid-state sensors are used in a wide range of applications, due to their advantages like small size and low-cost. The investigations about zirconia-based electrochemical sensors include a wide range of studies for detection of O 2 , NO 2 , CO, CO 2 , hydrocarbons and other air pollutant gases. 1-11 The ceramic-based sensors offer strong mechanical stability and thermal stress resistance. This helps to keep the behavior of the sensor not so dependent on aging effect. In addition, thermal stability of this type of sensors helps to use them in harsh environments and higher temperatures, as compared to the semiconductor (such as SnO 2 )-based sensors. 12 The type of the materials used for the electrodes of electrochemical sensors can also affect responses and different semiconducting metal oxides such as WO 3 , Nb 2 O 5 , etc. have been used for electrode materials in different researches. 3,4,6,13 Among various semiconductor metal oxides, SnO 2 is a well-known oxide for detection of toxic and combustible gases and volatile organic compounds (VOCs). SnO 2 is a semiconductor with wide bandgap energy (3.6 eV), has high chemical stability and excellent electrical properties. 14 SnO 2 doped with various semiconductor metal oxides, including (ZnO, CuO and Sm 2 O 3 ) 14-18 are currently used in fabrication of resistive type of gas sensors for detection of different pollutants e.g. VOCs with improved performance.Li et al. have studied the influence of chemical composition and morphology of the tin-doped indium oxide electrode and YSZ, ScSZ, and perovskite-type solid state oxygen conducting electrolytes on the sensing properties of mixed-po...

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Section: Resultsmentioning

confidence: 99%

Coupled Metal Oxide-Doped Pt/SnO₂Semiconductor and Yittria-Stabilized Zirconia Electrochemical Sensors for Detection of VOCs

kasalizadeh

Khodadadi

Mortazavi

2013

J. Electrochem. Soc.

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“…A possible sensing mechanism of the Sm 2 O 3 decorated SnO 2 based sensor to C 2 H 2 may be explained as follows [37,38]. Firstly, oxide Sm 2 O 3 might work as an effective catalyst, which benefits the effect of active center for C 2 H 2 adsorption.…”

Section: L/l Of C 2 H 2 Is 260mentioning

confidence: 99%

Research on Acetylene Sensing Properties and Mechanism of SnO₂Based Chemical Gas Sensor Decorated with Sm₂O₃

Zhou

Cao

et al. 2015

Journal of Nanotechnology

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Acetylene C 2 H 2 gas is one of the most important fault characteristic hydrocarbon gases dissolved in oil immersed power transformer oil. This paper reports the successful preparation and characterization of samarium oxide Sm 2 O 3 decorated tin oxide SnO 2 based sensors with hierarchical rod structure for C 2 H 2 gas detection. Pure and Sm 2 O 3 decorated SnO 2 sensing structures were synthesized by a facile hydrothermal method and characterized by XRD, FESEM, TEM, EDS, and XPS measurements, respectively. Planar chemical gas sensors with the synthesis samples were fabricated, and their sensing performances to C 2 H 2 gas were systematically performed and automatically recorded by a CGS-1 TP intelligent gas sensing analysis system. The optimum operating temperature of the Sm 2 O 3 decorated SnO 2 based sensor towards 50 L/L of C 2 H 2 is 260 ∘ C, and its corresponding response value is 38.12, which is 6 times larger than the pure one. Its response time is about 8-10 s and 10-13 s for recovery time. Meanwhile good stability and reproducibility of the decorated sensor to C 2 H 2 gas are also obtained. Furthermore, the proposed sensor exhibits excellent C 2 H 2 selectivity among some potential interface gases, like H 2 and CO gas. All sensing results indicate the sensor fabricated with oxide Sm 2 O 3 decorated SnO 2 nanorods might be a promising candidate for C 2 H 2 detection in practice.

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“…At the same time, ceramics based on strontium and barium titanates have high dielectric constant indices, and doping in these cases can significantly increase these indices, while reducing the threshold value of phase transition temperature, as well as changing the temperature dependence of phase transitions. In turn, the choice of samarium oxide as a dopant, which has unique dielectric and magnetic properties, as well as high resistance to external effects and corrosion, allows the expansion of the properties of titanates due to the formation of solid solutions of introduction or substitution [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of SrTiO3 Ceramic Doped with Sm2O3

2021

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The aim of this work was to study the effect of samarium oxide doping on a SrTiO3 perovskite ceramic. After analyzing the data obtained on the morphological features of the synthesized structures, it was found that an increase in the dopant concentration led not only to a change in the morphological features, but also in the density of the ferroelectrics. Using the X-ray diffraction method, it was found that doping with Sm2O3 led to the formation of a multiphase system of two cubic phases of SrTiO3 and Sm2O3. At the same time, an increase in the concentration of Sm2O3 dopant led to a change in the crystallinity degree, as well as deformation of the structure. Evaluation of the efficiency of use of synthesized ferroelectrics as catalysts for purification of aqueous media from manganese showed that an increase in the concentration of Sm2O3 dopant led to an increase in purification efficiency by 50–70%.

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Sm2O3 doped-SnO2 nanoparticles, very selective and sensitive to volatile organic compounds

Cited by 54 publications

References 28 publications

Coupled Metal Oxide-Doped Pt/SnO₂Semiconductor and Yittria-Stabilized Zirconia Electrochemical Sensors for Detection of VOCs

Coupled Metal Oxide-Doped Pt/SnO₂Semiconductor and Yittria-Stabilized Zirconia Electrochemical Sensors for Detection of VOCs

Research on Acetylene Sensing Properties and Mechanism of SnO₂Based Chemical Gas Sensor Decorated with Sm₂O₃

Synthesis and Properties of SrTiO3 Ceramic Doped with Sm2O3

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Sm2O3 doped-SnO2 nanoparticles, very selective and sensitive to volatile organic compounds

Cited by 54 publications

References 28 publications

Coupled Metal Oxide-Doped Pt/SnO2Semiconductor and Yittria-Stabilized Zirconia Electrochemical Sensors for Detection of VOCs

Coupled Metal Oxide-Doped Pt/SnO2Semiconductor and Yittria-Stabilized Zirconia Electrochemical Sensors for Detection of VOCs

Research on Acetylene Sensing Properties and Mechanism of SnO2Based Chemical Gas Sensor Decorated with Sm2O3

Synthesis and Properties of SrTiO3 Ceramic Doped with Sm2O3

Contact Info

Product

Resources

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Coupled Metal Oxide-Doped Pt/SnO₂Semiconductor and Yittria-Stabilized Zirconia Electrochemical Sensors for Detection of VOCs

Coupled Metal Oxide-Doped Pt/SnO₂Semiconductor and Yittria-Stabilized Zirconia Electrochemical Sensors for Detection of VOCs

Research on Acetylene Sensing Properties and Mechanism of SnO₂Based Chemical Gas Sensor Decorated with Sm₂O₃