Sensing low concentrations of CO using flame-spray-made Pt/SnO2 nanoparticles

Mädler, Lutz; Sahm, T.; Gurlo, Aleksander; Grunwaldt, Jan‐Dierk; Bârsan, Nicolae; Weimar, Udo; Pratsinis, S E

doi:10.1007/s11051-005-9029-6

Cited by 161 publications

(108 citation statements)

References 44 publications

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“…Recently, metal oxide semiconductors (MOS) [10][11][12][13][14][15][16][17] have been extensively investigated for this purpose due to their simplicity, small dimensions and attractive price. Several types of metal oxide semiconductors have been used as sensing material for different type of gases.…”

Section: Introductionmentioning

confidence: 99%

The Monitoring of H2S and SO2 Noxious Gases from Industrial Environment with Sensors Based on Flame-Spray-Made SNO2 Nanoparticles

Liewhiran¹,

Tamaekong²,

Wisitsoraat³

et al. 2012

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Abstract. The noxious gas sensors were developed successfully using flame-spray-made SnO2 nanoparticles as the sensing materials. The functionalized nanoparticle properties were further analyzed by XRD, BET and TEM analyses. The SnO2 nanoparticles (SSABET: 141.6 m 2 /g) were investigated revealing non-agglomerated spherical, hexagonal, rectangle (3-10 nm), and rod-like (3-5 nm in width and 5-20 nm in length) morphologies. The sensing films were prepared by spin coating onto the Al2O3 substrates interdigitated with Au electrodes. The sensing films were significantly developed in order to detect with H2S (0.5-10 ppm) and SO2 (20-500 ppm) at the operating temperature ranging from 200-350°C. After sensing test, the cross-section of sensing film was analyzed by SEM analyses. It was found that SnO2 sensing film showed higher sensitivity to H2S gas with very fast response at lower concentrations (3s, to 10 ppm). The cross sensitivities of the sensor towards different concentrations of H2S, CO, H2, and C2H2 were measured at 300°C. The sensor evidently shows much less response to CO, H2, and C2H2 than to H2S indicating higher selectivity for H2S of the SnO2 sensor at the lower concentration (10 ppm). Therefore, the SnO2 sensor was the most suitable candidate for the efficient detection of H2S noxious gas.

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Section: Introductionmentioning

confidence: 99%

The Monitoring of H2S and SO2 Noxious Gases from Industrial Environment with Sensors Based on Flame-Spray-Made SNO2 Nanoparticles

Liewhiran¹,

Tamaekong²,

Wisitsoraat³

et al. 2012

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“…The size of the noble metal cluster has a profound influence on the material performance, e.g., for structure sensitive reactions 1 and sensor sensitivity. 2 Though typically these materials are made by multi-step wetchemistry processes, recently, flame technology has been used for one-step synthesis of Pt, Pd, Ag, and Au nanoparticles on various nanostructured supports such as Al 2 O 3 , 3,4 SiO 2 , 5 and TiO 2 . [5][6][7] The as-prepared materials exhibit a high external specific surface area (40-320 m 2 / g) with a high degree of crystallinity and an excellent noble metal dispersion.…”

Section: Introductionmentioning

confidence: 99%

Independent Control of Metal Cluster and Ceramic Particle Characteristics During One-step Synthesis of Pt/TiO₂

et al. 2005

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Rapid quenching during flame spray synthesis of Pt/TiO 2 (0-10 wt% Pt) is demonstrated as a versatile method for independent control of support (TiO 2 ) and noble metal (Pt) cluster characteristics. Titania grain size, morphology, crystal phase structure, and crystal size were analyzed by nitrogen adsorption, electron microscopy and x-ray diffraction, respectively, while Pt-dispersion and size were determined by CO-pulse chemisorption. The influence of quench cooling on the flame temperature was analyzed by Fourier transform infrared spectroscopy. Increasing the quench flow rate reduced the Pt diameter asymptotically. Optimal quenching with respect to maximum Pt-dispersion (∼60%) resulted in average Pt diameters of 1.7 to 2.3 nm for Pt-contents of 1-10 wt%, respectively.

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“…1, [13][14][15] On the other hand very recently state-of-art high resolution fluorescence EXAFS (HRFEXAFS) techniques on the real gas sensor have suggested a quite different model where the Pt ion is located at the Sn position in the rutile structure on Pt/SnO 2 . 16,17 However the information derived from the HRFEXAFS was limited to the concentration as low as 0.2 wt% which is lower than the Pt content in our highest performance sample.…”

mentioning

confidence: 99%

Characterization of Pt-doped SnO2 catalyst for a high-performance micro gas sensor

Murata

Suzuki

Kobayashi

et al. 2013

Phys. Chem. Chem. Phys.

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The atomic scale structure and its dependence on Pt concentration of a Pt-doped SnO 2 (Pt/SnO 2 ) thin film produced by a sputter-deposition method was investigated，which showed a high-performance methane gas sensor. Extended X-ray absorption fine structure (EXAFS) and X-ray diffraction (XRD) analyses showed that Pt/SnO 2 has a rutile structure similar to SnO 2 crystals at less than 10 at% Pt where the Pt ion was located at the Sn position in the rutile structure. There was no evidence that Pt metal clusters were formed in the Pt/SnO 2 films. The Pt/SnO 2 structure became amorphous at greater than 11 at% Pt. We found a good correlation between the methane activity and local structure of Pt.

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Sensing low concentrations of CO using flame-spray-made Pt/SnO2 nanoparticles

Cited by 161 publications

References 44 publications

The Monitoring of H2S and SO2 Noxious Gases from Industrial Environment with Sensors Based on Flame-Spray-Made SNO2 Nanoparticles

The Monitoring of H2S and SO2 Noxious Gases from Industrial Environment with Sensors Based on Flame-Spray-Made SNO2 Nanoparticles

Independent Control of Metal Cluster and Ceramic Particle Characteristics During One-step Synthesis of Pt/TiO₂

Characterization of Pt-doped SnO2 catalyst for a high-performance micro gas sensor

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Sensing low concentrations of CO using flame-spray-made Pt/SnO2 nanoparticles

Cited by 161 publications

References 44 publications

The Monitoring of H2S and SO2 Noxious Gases from Industrial Environment with Sensors Based on Flame-Spray-Made SNO2 Nanoparticles

The Monitoring of H2S and SO2 Noxious Gases from Industrial Environment with Sensors Based on Flame-Spray-Made SNO2 Nanoparticles

Independent Control of Metal Cluster and Ceramic Particle Characteristics During One-step Synthesis of Pt/TiO2

Characterization of Pt-doped SnO2 catalyst for a high-performance micro gas sensor

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Independent Control of Metal Cluster and Ceramic Particle Characteristics During One-step Synthesis of Pt/TiO₂