H2S Sensing Properties of Macroporous In2O3-Based Sensors

Ishibashi, Chikako; Hyodo, Takeo; Shimizu, Yasuhiro; Egashira, Makoto

doi:10.1166/sl.2011.1482

Cited by 12 publications

(7 citation statements)

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“…1,2 A wide range of oxides especially SnO 2 , ZnO and WO 3 are used as active sensor materials in diverse morphologies. [3][4][5][6] A large number of oxides show good sensitivities to various gases like CO, NO x , SO x , NH 3 , alcohols and other Volatile Organic Compounds (VOCs). VOCs are very common hazardous pollutants in the environment.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of these oxides are intrinsically n-type. 2,[6][7][8] The utility of n-type oxides is still limited to a few gaseous substances, owing to their low selectivity and pronounced humidity interference. [9][10][11] Hence, there is a need for alternative materials which can overcome these difficulties and can show better gas sensing properties at moderate temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gas sensing response analysis of p-type porous chromium oxide thin films

Kamble

Umarji

2013

J. Mater. Chem. C

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gas sensing response analysis of p-type porous chromium oxide thin films

Kamble

Umarji

2013

J. Mater. Chem. C

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“…However, the gas sensors fabricated with these mesoporous materials generally had some disadvantages such as relatively large resistance and slow recovery speed. On the other hand, macroporous gas-sensing materials were prepared by a modified sol-gel technique [52][53][54][55][56][57], ultrasonic-spray pyrolysis [58][59][60][61], or physical vapor deposition technique [62,63] employing polymethylmethacrylate (PMMA) microspheres (Soken Chem. & Eng.…”

Section: Introductionmentioning

confidence: 99%

Microstructural control of porous In2O3 powders prepared by ultrasonic-spray pyrolysis employing self-synthesized polymethylmethacrylate microspheres as a template and their NO2-sensing properties

Hyodo

Fujii

Ishida

et al. 2017

Sensors and Actuators B: Chemical

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NO2-sensing properties of porous In2O3 powders prepared by ultrasonic-spray pyrolysis employing self-synthesized polymethylmethacrylate (PMMA) microspheres as a template have been investigated in this study. The PMMA microspheres were synthesized by ultrasonicassisted emulsion polymerization. The pore-size distribution, crystallite size (CS), and specific surface area (SSA) of the porous In2O3 powders prepared with the PMMA microspheres with a diameter of ca. 77 nm (pr-In2O3(Tp), Tp: pyrolysis temperature, 600-1100 (ºC)) are largely dependent on the pyrolysis temperature of the ultrasonic-spray pyrolysis. On the other hand, the porous In2O3 powder prepared by ultrasonic-spray pyrolysis at 1100ºC employing PMMA microspheres with a diameter of ca. 26 nm (pr-In2O3(Tp)S) had larger pore volume and smaller SSA than the pr-In2O3(1100) powder, whereas the CS of the pr-In2O3(Tp)S powder was comparable to that of the pr-In2O3(1100) powder. The pr-In2O3(Tp) and pr-In2O3(1100)S sensors (Tp: 600 or 1100) showed larger response and faster response speed to 10 ppm NO2 than the conventional In2O3 sensor (the sensor fabricated with In2O3 powder prepared by ultrasonicspray pyrolysis without PMMA microspheres at 1100ºC) at lower temperatures, because of their well-developed porous structure, small CS, and large SSA. In addition, the magnitude of response of the pr-In2O3(1100) sensor to 10 ppm NO2 was larger than that of the pr-In2O3 (600) sensor at less than 250ºC, whereas smaller CS and larger SSA of the pr-In2O3(600) powder were effective in improving the magnitude of response to NO2 at a low concentration. The pr-In2O3(1100)S sensor showed relatively larger response and faster response speed to NO2 at a low concentration than the pr-In2O3(1100) sensor at lower temperatures, which probably indicated that the well-developed medium pores was important for enhancing these NO2sensing properties.

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“…On the other hand, macroporous oxides [17][18][19][20][21][22][23][24][25][26] and carbonates [27,28] as an gas-sensing material were also prepared by different preparation methods such as modified sol-gel technique [17][18][19][20], ultrasonic-spray pyrolysis [21][22][23][24], sputtering [25] and pulsed laser deposition [26], employing commercial polymethylmetacrylate (PMMA) microspheres (150~1500 nm in diameter) as a template. Since the pore size of their macroporous materials was larger than 100 nm in diameter, the introduction of the relatively-large pores improved the gas diffusivity in the gas-sensing films and/or disks significantly, and in turn the gas-sensing properties.…”

Section: Introductionmentioning

confidence: 99%

Porous In2O3 powders prepared by ultrasonic-spray pyrolysis as a NO2-sensing material: Utilization of polymethylmethacrylate microspheres synthesized by ultrasonic-assisted emulsion polymerization as a template

Hyodo

Furuno

Fujii

et al. 2013

Sensors and Actuators B: Chemical

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NO2-sensing properties of porous In2O3 (pr-In2O3) powders prepared by ultrasonic-spray pyrolysis employing polymethylmethacrylate (PMMA) microspheres as a template has been investigated in this study. The PMMA microspheres were synthesized in water by ultrasonic-assisted emulsion polymerization employing methyl methacrylate monomer, sodium lauryl sulfate as a surfactant and ammonium persulfate as an initiator. The PMMA microspheres synthesized was quite uniform and the particle size was ca. 60.2 nm (measured by dynamic light scattering). The microstructure of pr-In2O3 powders prepared was largely dependent on the kind of In2O3 sources. The pr-In2O3 which was prepared from In(NO3)3 as an In2O3 source (pr-In2O3(N)) consisted of submicron-sized spherical particles with well-developed spherical mesopores (several tens of nanometers in pore diameter) and each oxide wall among pores was constructed with meso-sized In2O3 particles connected continuously. On the other hand, the pr-In2O3 which was prepared from InCl3 as an In2O3 source (pr-In2O3(Cl)) was composed of a large number of dispersed meso-sized particles and a few submicron-sized dense spherical particles.In contrast, the morphology of conventional In2O3 powder (c-In2O3) prepared by ultrasonic-spray pyrolysis of PMMA-freeIn(NO3)3 aqueous solution as a reference was relatively dense and roughly-spherical with a diameter of ca. 100~700 nm. The responses to 1.0 and 10 ppm NO2 of pr-In2O3 sensors in air were much larger than those of a c-In2O3(N) sensor in the temperature range of less than 250°C and 300°C, respectively. In addition, the response and recovery speeds of both the pr-In2O3 sensors were much faster than those of the c-In2O3(N) sensor, because of the well-developed porous structure of the pr-In2O3 sensors.

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H₂S Sensing Properties of Macroporous In₂O₃-Based Sensors

Cited by 12 publications

References 0 publications

Gas sensing response analysis of p-type porous chromium oxide thin films

Gas sensing response analysis of p-type porous chromium oxide thin films

Microstructural control of porous In2O3 powders prepared by ultrasonic-spray pyrolysis employing self-synthesized polymethylmethacrylate microspheres as a template and their NO2-sensing properties

Porous In2O3 powders prepared by ultrasonic-spray pyrolysis as a NO2-sensing material: Utilization of polymethylmethacrylate microspheres synthesized by ultrasonic-assisted emulsion polymerization as a template

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