Characterization of nanosized TiO2 based H2S gas sensor

Chaudhari, G. N.; Bambole, Devidas R.; Bodade, Anjali B.; Padole, P. R.

doi:10.1007/s10853-006-0042-7

Cited by 61 publications

(28 citation statements)

References 17 publications

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“…Although the volume of the literature is remarkable, most of the works are devoted to semiconducting oxides and the operation temperatures of these sensors have been reported from only room temperature to 300 • C. One of the few papers describing sensing H 2 S at higher temperatures was completed by Dawson et al; they utilized a Cr 2-y Ti y O 3+x sensing composition for a resistive-type sensor design [18] The material demonstrated a p-type characteristic at elevated temperatures (>250 • C) and showed an increase in resistance upon exposure to H 2 S (50 ppm) within a testing range of 250-500 • C. It is the sole paper, at least to our knowledge in literature, that provided temperature desorption curves for both SO 2 and H 2 S. It was seen that H 2 S exhibited two maxima at about 150 • C and 470 • C; however, the loss of SO 2 from the surface occurred at 470 • C. It was concluded that a sensor that operates at 350 • C can be cleaned by heat treatment, and a pre-treatment will increase the sensor response of the sensor [18] Some of the other transition metal oxides demonstrated for H 2 S sensing are as follows: PdO x , WO 3 , MoO 3 , In 2 O 3 , CeO 2 , SnO 2 , TiO 2 , ZnO, CuO, CdO, and various ferrites [10,15,[19][20][21][22][23][24][25][26] A majority of these reports are based on WO 3 compositions [8,10,15,[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] In the current work, tungstate and molybdate compositions were investigated as alternative sensing materials to the typical binary compositions for sulfur gas species at higher testing temperatures (≥600 • C). Tungstates and molybdates are known to be wide band gap oxide semiconductors (3-5 eV).…”

Section: Introductionmentioning

confidence: 99%

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Çiftyürek

Sabolsky

2016

Sensors and Actuators B: Chemical

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a b s t r a c tThere is an increasing desire to control and monitor gas emissions from coal-fired power plants and other industrial systems. With this desire, there is a growing need for distributed gas sensors to monitor these emissions at high temperature ( > 600 • C), especially for pollutants such as SO 2 and H 2 S. The objective of this work was to investigate molybdenum and tungsten binary and ternary oxide thick films on a chemiresistive sensor platform for monitoring of gas sulfur species. The work evaluated the SO 2 sensitivity of WO 3 , MoO 3 , SrMoO 4 , NiMoO 4 , Sr 2 MgMoO 6-␦ (SMM), Sr 2 MgWO 6-␦ (SMW), NiWO 4 , and SrWO 4 compositions at 600-1000 • C. The SrMoO 4 composition at both the micro-and nano-particulate scale showed the most promise in sensitivity, stability and selectivity to SO 2 up to 1000 • C. Hydrothermallysynthesized nano-SrMoO 4 showed the highest sensor response with the R max values of −17.2, −50.2 and −40.5 upon exposure to a 20 min pulse of 2000 ppm of SO 2 at 600 • C, 800 • C and 1000 • C, respectively. Similar sensitivity trends were distinguished down to 1-5 min SO 2 pulses. The nano-SrMoO 4 showed low cross-selectivity to H 2 and CO. Finally, the nano-SrMoO 4 sensor was also tested with H 2 and coal syngas containing 5-100 ppm H 2 S, where high sensitivities were realized for both, but the sensing mechanism was altered in the latter (n-type to p-type semiconducting behavior). In order to better understand the sensing mechanism, extensive microstructural, electronic and chemical property characterizations were completed in this work.

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Section: Introductionmentioning

confidence: 99%

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Çiftyürek

Sabolsky

2016

Sensors and Actuators B: Chemical

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“…[1][2][3][4][5] Compare to bulk metal oxide materials, the nano-/ micro-scaled metal oxide materials have large surface to volume ratio and a high level of crystallinity. These can affect chemical, physical, and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and Morphological Investigation of Co₃O₄Microfibers Produced by Electrospinning Process

Baek¹,

Park²,

Hwang³

et al. 2012

Bulletin of the Korean Chemical Society

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The Co oxide microfibers were synthesized using the electrospinning process and formed Co 3 O 4 microfibers after being calcined at high temperatures. The calcination temperature influenced the diameters, morphology, crystalline phase, and chemical environment of the fibers. The surface morphology of the obtained fibers was examined by using the scanning electron microscope (SEM). As the calcination temperatures increased from room temperature to 873 and 1173 K, the diameters of the cobalt oxide fibers decreased from 1.79 to 0.82 and 0.32 mm, respectively. The structure of the fibers was investigated with X-ray diffraction (XRD) and transmission electron microscopy (TEM). The calcined Co 3 O 4 fibers had crystalline face-centered cubic (fcc) structure. The X-ray photoelectron spectroscopy (XPS) results revealed that increasing the calcination temperature promoted the formation of Co 2+ and Co 3+ species.

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“…The advantage of using nano adsorbents for heavy metal remediation from wastewaters lies in their properties such as high porosity and enhanced structural properties suitable for adsorption process. Nanostructured metal oxide materials have attracted considerable attention because of their potential applications in many areas such as electronics, photonics, sensors and catalysis [7]- [9]. Nanofibers are an excellent new class of materials being used for numerous applications such as insulation, medical, cosmetics and filtration, etc.…”

Section: Introductionmentioning

confidence: 99%

Titania Nanofibers: A Potential Adsorbent for Mercury and Lead Uptake

Dixit¹,

Mishra²,

Alam³

2017

IJCEA

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Abstract-The present investigation focuses on testing the adsorptive behaviour of laboratory synthesized titania nanofibers towards Hg(II) and Pb(II) in the aqueous system. The BET analysis confirmed that the electrospinned nanofibers were confirmed to possess a large surface area of 740 m 2 /g. The fiber mats were analysed by EDX, which confirmed the adsorption of the metals on the fiber surface. SEM revealed the smooth morphology and continuous nature of the fibers. The effect of pH, contact time and adsorbent dose is compared for both the metals. At the most optimized conditions, highest uptake of 95.5% was observed for 0.01 mg/L Hg(II) concentration while it was 83.8% for 0.5 mg/L Pb(II) concentration. Since the rate limiting steps in adsorption are of vital importance in order to define the rate parameters for design purposes, the present study takes into account Weber and Morris and Boyd mass transfer diffusion models for both Hg(II) and Pb(II) adsorption on titania nanofibers. The equilibrium data were then analyzed using Langmuir and Freundlich sorption models and the characteristic sorption parameters for each isotherm were determined. The discussion also focuses on few of the recently used adsorbents for heavy metal uptake and their comparison with the present study.Index Terms-Adsorption, heavy metals, isotherm, mass transfer, nano adsorbent.

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Characterization of nanosized TiO2 based H2S gas sensor

Cited by 61 publications

References 17 publications

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Spectroscopic and Morphological Investigation of Co₃O₄Microfibers Produced by Electrospinning Process

Titania Nanofibers: A Potential Adsorbent for Mercury and Lead Uptake

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Characterization of nanosized TiO2 based H2S gas sensor

Cited by 61 publications

References 17 publications

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Molybdenum and tungsten oxide based gas sensors for high temperature detection of environmentally hazardous sulfur species

Spectroscopic and Morphological Investigation of Co3O4Microfibers Produced by Electrospinning Process

Titania Nanofibers: A Potential Adsorbent for Mercury and Lead Uptake

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Spectroscopic and Morphological Investigation of Co₃O₄Microfibers Produced by Electrospinning Process