Acetone sensors based on TiO2 nanocrystals modified with tungsten oxide species

Epifani, Mauro; Comini, Elisabetta; Dı́az, Raúl; Genç, Aziz; Andreu, Teresa; Siciliano, P.; Morante, Joan Ramón

doi:10.1016/j.jallcom.2016.01.077

Cited by 34 publications

(20 citation statements)

References 29 publications

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“…CuO-TiO 2 -Au structure showed high response values towards reducing and oxidizing gases at 100 and 200 • C [79]. The high sensing response was achieved due to the formation of an interfacial area p-n heterojunction between the p-type CuO and the n-type TiO 2 increasing the lifetime of charge carriers.…”

Section: Improvement Of Sensing Performance Including the Operating Tmentioning

confidence: 97%

“…The manufacturing of gas sensors based on composite nanomaterials and heterojunctions provides novel opportunities to improve the sensing properties of metal oxides [7,43,78,79]. The The doping of Co 3 O 4 nanomaterials with fluorine (F) resulted in higher responses towards volatile organic compounds (VOCs) and lowered the working temperature (200 • C) compared to the fluorine-free systems [74].…”

Section: Improvement Of Sensing Performance Including the Operating Tmentioning

confidence: 99%

“…The manufacturing of gas sensors based on composite nanomaterials and heterojunctions provides novel opportunities to improve the sensing properties of metal oxides [7,43,78,79]. The superior gas sensing performance of ZnO-TiO 2 nanocomposites for the detection of VOCs with respect to the pristine ZnO was demonstrated in an early report [78].…”

Section: Improvement Of Sensing Performance Including the Operating Tmentioning

confidence: 99%

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Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

Galstyan

Kaur

Zappa

et al. 2020

Sensors

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In this paper, we present the investigations on metal oxide-based gas sensors considering the works performed at SENSOR lab, University of Brescia (Italy). We reported the developments in synthesis techniques for the preparation of doped and functionalized low-dimensional metal oxide materials. Furthermore, we discussed our achievements in the fabrication of heterostructures with unique functional features. In particular, we focused on the strategies to improve the sensing performance of metal oxides at relatively low operating temperatures. We presented our studies on surface photoactivation of sensing structures considering the application of biocompatible materials in the architecture of the functional devices as well.

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Section: Improvement Of Sensing Performance Including the Operating Tmentioning

confidence: 97%

Section: Improvement Of Sensing Performance Including the Operating Tmentioning

confidence: 99%

“…The manufacturing of gas sensors based on composite nanomaterials and heterojunctions provides novel opportunities to improve the sensing properties of metal oxides [7,43,78,79]. The superior gas sensing performance of ZnO-TiO 2 nanocomposites for the detection of VOCs with respect to the pristine ZnO was demonstrated in an early report [78].…”

Section: Improvement Of Sensing Performance Including the Operating Tmentioning

confidence: 99%

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Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

Galstyan

Kaur

Zappa

et al. 2020

Sensors

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“…They have found a good response at 100 ppm. Epira et al [22] reported the good acetone performance of TiO 2 modified with tungsten species at a working temperature of 200°C. The low acetone (20 ppm) performance of copper-doped tungsten sensor was reported [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of varying ethanol and water compositions on the acetone sensing properties of WO₃ for application in diabetes mellitus monitoring

Saasa

Lemmer²,

Malwela

et al. 2020

Mater. Res. Express

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Tungsten oxide based gas sensors have attracted a lot of attention in breath acetone analysis due to their potential in clinical diagnosis of diabetes. The major problem with this material in sensor application has been remarkable response to all gases but low selectivity to specific gases. Herein, we report the gas sensing performance of WO 3 materials which were synthesized by varying water and ethanol ratios using a facile solvothermal method for acetone detection. The gas sensing properties of as-prepared WO 3 were tested on acetone C 7 H 8 , NO 2 , NH 3 , H 2 S and CH 4 under relative humidity. X-ray diffraction patterns show that as-prepared WO 3 samples are mainly composed of monoclinic WO 3 , a phase having relatively high selectivity to acetone. The as-prepared WO 3 sensors produced using 51:49 ratio of water: ethanol show an increase in acetone response as the acetone concentration increases and a decrease in acetone response as the relative humidity increases. The sensor responded to a very low acetone concentration ranging from 0.5 to 4.5 ppm which is normally found in human breath. Furthermore, the sensor exhibited high sensitivity and selectivity to low ppm of acetone at 100°C. On contrary, the sensor showed significantly lower response to other gases tested.

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“…In the past decades, metal semiconductor oxides have attracted much attention for their high sensitivity and stability toward reducing gases. Examples such as TiO 2 [ 11 , 12 , 13 ], NiO [ 14 , 15 ], ZnO [ 16 , 17 , 18 , 19 ], Co 3 O 4 [ 20 ], Fe 2 O 3 [ 21 , 22 ], WO 3 [ 23 , 24 , 25 ], and SnO 2 [ 26 , 27 , 28 , 29 , 30 ] are reported as acetone sensors with good performance. In recent years, the perovskite structure (ABO 3 ) also showed good sensitivity, stability and selectivity toward acetone, with examples such as LaFeO 3 [ 31 , 32 ] Yb 1−x Ca x FeO 3 [ 33 ] LaNi 1−x Ti x O 3 [ 34 ] SmFeO 3 [ 35 ], SmFe 1−x Mg x O 3 [ 36 ], NdFeO 3 [ 37 ] and La 0.75 Ba 0.25 FeO 3 [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

An Ultrahigh Sensitivity Acetone Sensor Enhanced by Light Illumination

Zhang

Qin

Gao

et al. 2018

Sensors

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Au:SmFe0.9Zn0.1O3 is synthesized by a sol-gel method and annealed at 750 °C. Through XRD, SEM and XPS analysis methods, the microstructure of the material has been observed. The average particle size is about 50 nm. The sensor shows a high sensitivity toward acetone vapor. As the relative humidity increases, the resistance and sensitivity of the sensor decline. To obtain a low optimum operating temperature, light illumination with different wavelengths has been introduced. The sensitivity toward acetone is improved at lower operating temperature when the sensor is irradiated by light. The smaller the wavelengths, the better the sensitivity of the sensor. Compared with other gases, the sensor shows excellent selectivity to acetone vapor, with better sensitivity, selectivity and stability when under light illumination.

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Acetone sensors based on TiO2 nanocrystals modified with tungsten oxide species

Cited by 34 publications

References 29 publications

Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

Effect of varying ethanol and water compositions on the acetone sensing properties of WO₃ for application in diabetes mellitus monitoring

An Ultrahigh Sensitivity Acetone Sensor Enhanced by Light Illumination

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Acetone sensors based on TiO2 nanocrystals modified with tungsten oxide species

Cited by 34 publications

References 29 publications

Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

Chemical Gas Sensors Studied at SENSOR Lab, Brescia (Italy): From Conventional to Energy-Efficient and Biocompatible Composite Structures

Effect of varying ethanol and water compositions on the acetone sensing properties of WO3 for application in diabetes mellitus monitoring

An Ultrahigh Sensitivity Acetone Sensor Enhanced by Light Illumination

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Product

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Effect of varying ethanol and water compositions on the acetone sensing properties of WO₃ for application in diabetes mellitus monitoring